Stock Award Plans (Details) - USD ($)	12 Months Ended
Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Stock Award Plans [Abstract]
Compensation cost	$ 11,104,000	$ 11,591,000	$ 11,621,000
Income tax benefit	$ 4,120,000	4,358,000	4,370,000
Stock Award Plan Information [Abstract]
Term of grant	7 years
Vesting period	3 years
Share-based Compensation Plans Combined Disclosure [Abstract]
Intrinsic value of stock options exercised	$ 2,555,000	11,671,000	6,703,000
Tax benefit from stock options exercised	948,000	4,388,000	2,520,000
Intrinsic value of restricted stock vestings	10,270,000	14,847,000	10,993,000
Tax benefit from restricted stock vesting	3,810,000	5,583,000	4,133,000
Fair value of options vested	2,180,000	3,759,000	3,341,000
Fair value of restricted stock vested	$ 10,270,000	$ 14,847,000	$ 10,993,000
Fair value of stock options granted (in dollars per share)	$ 25.18	$ 36.05	$ 25.14
Fair value of stock options granted	$ 2,893,000	$ 4,226,000	$ 4,184,000
Employee Stock Award Plan [Member]
Stock Award Plan Information [Abstract]
Shares available for future grants (in shares)	2,329,238
Options Exercisable [Abstract]
Stock options exercisable (in shares)	239,518	157,140	175,170
Unvested Restricted Stock Award Shares [Roll Forward]
Nonvested balance beginning of period, Unvested Restricted Stock Award Shares (in shares)	321,453	399,278	418,128
Granted, Unvested Restricted Stock Award Shares (in shares)	122,740	97,706	139,971
Vested, Unvested Restricted Stock Award Shares (in shares)	(113,958)	(141,870)	(149,162)
Forfeited, Unvested Restricted Stock Award Shares (in shares)	(18,508)	(33,661)	(9,659)
Nonvested balance end of period, Unvested Restricted Stock Award Shares (in shares)	311,727	321,453	399,278
Weighted Average Grant Date Fair Value Per Share [Abstract]
Nonvested balance end of period, Weighted Average Grant Date Fair Value Per Share (in dollars per share)	$ 71.04	$ 54.92	$ 45.39
Granted, Weighted Average Grant Date Fair Value Per Share (in dollars per share)	75.04	97.46	69.85
Vested, Weighted Average Grant Date Fair Value Per Share (in dollars per share)	60.73	45.64	44.30
Forfeited, Weighted Average Grant Date Fair Value Per Share (in dollars per share)	82.00	63.56	61.20
Nonvested balance end of period, Weighted Average Grant Date Fair Value Per Share (in dollars per share)	75.73	$ 71.04	$ 54.92
Employee Stock Award Plan [Member] \| First Price Range [Member]
Outstanding and Exercisable Stock options [Abstract]
Range of Exercise Prices, upper limit (in dollars per share)	36.35
Range of Exercise Prices, lower limit (in dollars per share)	$ 31.35
Options Outstanding [Abstract]
Number Outstanding (in shares)	16,910
Weighted Average Remaining Contractual Life	1 year 1 month 6 days
Weighted Average Exercise Price, Options Outstanding (in dollars per share)	$ 32.82
Options Exercisable [Abstract]
Number Exercisable (in shares)	16,910
Weighted Average Exercise Price, Options Exercisable (in dollars per share)	$ 32.82
Employee Stock Award Plan [Member] \| Second Price Range [Member]
Outstanding and Exercisable Stock options [Abstract]
Range of Exercise Prices, upper limit (in dollars per share)	$ 46.74
Options Outstanding [Abstract]
Number Outstanding (in shares)	56,629
Weighted Average Remaining Contractual Life	2 years 1 month 6 days
Weighted Average Exercise Price, Options Outstanding (in dollars per share)	$ 46.74
Options Exercisable [Abstract]
Number Exercisable (in shares)	56,629
Weighted Average Exercise Price, Options Exercisable (in dollars per share)	$ 46.74
Employee Stock Award Plan [Member] \| Third Price Range [Member]
Outstanding and Exercisable Stock options [Abstract]
Range of Exercise Prices, upper limit (in dollars per share)	74.99
Range of Exercise Prices, lower limit (in dollars per share)	$ 65.28
Options Outstanding [Abstract]
Number Outstanding (in shares)	283,963
Weighted Average Remaining Contractual Life	4 years 7 months 6 days
Weighted Average Exercise Price, Options Outstanding (in dollars per share)	$ 70.98
Options Exercisable [Abstract]
Number Exercisable (in shares)	141,669
Weighted Average Exercise Price, Options Exercisable (in dollars per share)	$ 67.90
Employee Stock Award Plan [Member] \| Fourth Price Range [Member]
Outstanding and Exercisable Stock options [Abstract]
Range of Exercise Prices, upper limit (in dollars per share)	96.85
Range of Exercise Prices, lower limit (in dollars per share)	$ 93.64
Options Outstanding [Abstract]
Number Outstanding (in shares)	35,763
Weighted Average Remaining Contractual Life	5 years 1 month 6 days
Weighted Average Exercise Price, Options Outstanding (in dollars per share)	$ 94.27
Options Exercisable [Abstract]
Number Exercisable (in shares)	11,921
Weighted Average Exercise Price, Options Exercisable (in dollars per share)	$ 94.27
Employee Stock Award Plan [Member] \| Fifth Price Range [Member]
Outstanding and Exercisable Stock options [Abstract]
Range of Exercise Prices, upper limit (in dollars per share)	114.11
Range of Exercise Prices, lower limit (in dollars per share)	$ 101.46
Options Outstanding [Abstract]
Number Outstanding (in shares)	37,167
Weighted Average Remaining Contractual Life	5 years 2 months 12 days
Weighted Average Exercise Price, Options Outstanding (in dollars per share)	$ 103.22
Options Exercisable [Abstract]
Number Exercisable (in shares)	12,389
Weighted Average Exercise Price, Options Exercisable (in dollars per share)	$ 103.22
Employee Stock Award Plan [Member] \| Full Exercise Price Range [Member]
Outstanding and Exercisable Stock options [Abstract]
Range of Exercise Prices, upper limit (in dollars per share)	114.11
Range of Exercise Prices, lower limit (in dollars per share)	$ 31.35
Options Outstanding [Abstract]
Number Outstanding (in shares)	430,432
Weighted Average Remaining Contractual Life	4 years 2 months 12 days
Weighted Average Exercise Price, Options Outstanding (in dollars per share)	$ 71.01
Aggregate Intrinsic Value, Options Outstanding	$ 668,000
Options Exercisable [Abstract]
Number Exercisable (in shares)	239,518
Weighted Average Exercise Price, Options Exercisable (in dollars per share)	$ 63.56
Aggregate Intrinsic Value, Options Exercisable	$ 668,000
2000 Director Plan [Member]
Stock Award Plan Information [Abstract]
Term of grant	10 years
Vesting period	6 months
Shares available for future grants (in shares)	539,531
Options Exercisable [Abstract]
Stock options exercisable (in shares)	220,429	298,334	320,082
Unvested Restricted Stock Award Shares [Roll Forward]
Nonvested balance beginning of period, Unvested Restricted Stock Award Shares (in shares)	292	384	348
Granted, Unvested Restricted Stock Award Shares (in shares)	20,350	8,160	10,536
Vested, Unvested Restricted Stock Award Shares (in shares)	(18,851)	(8,252)	(10,500)
Nonvested balance end of period, Unvested Restricted Stock Award Shares (in shares)	1,791	292	384
Weighted Average Grant Date Fair Value Per Share [Abstract]
Nonvested balance end of period, Weighted Average Grant Date Fair Value Per Share (in dollars per share)	$ 99.52	$ 75.65	$ 62.99
Granted, Weighted Average Grant Date Fair Value Per Share (in dollars per share)	78.52	99.52	75.65
Vested, Weighted Average Grant Date Fair Value Per Share (in dollars per share)	79.77	98.41	75.23
Nonvested balance end of period, Weighted Average Grant Date Fair Value Per Share (in dollars per share)	68.73	$ 99.52	$ 75.65
2000 Director Plan [Member] \| First Price Range [Member]
Outstanding and Exercisable Stock options [Abstract]
Range of Exercise Prices, upper limit (in dollars per share)	36.82
Range of Exercise Prices, lower limit (in dollars per share)	$ 29.60
Options Outstanding [Abstract]
Number Outstanding (in shares)	30,000
Weighted Average Remaining Contractual Life	1 year 10 months 24 days
Weighted Average Exercise Price, Options Outstanding (in dollars per share)	$ 33.60
Options Exercisable [Abstract]
Number Exercisable (in shares)	30,000
Weighted Average Exercise Price, Options Exercisable (in dollars per share)	$ 33.60
2000 Director Plan [Member] \| Second Price Range [Member]
Outstanding and Exercisable Stock options [Abstract]
Range of Exercise Prices, upper limit (in dollars per share)	56.45
Range of Exercise Prices, lower limit (in dollars per share)	$ 41.24
Options Outstanding [Abstract]
Number Outstanding (in shares)	71,276
Weighted Average Remaining Contractual Life	4 years 3 months 18 days
Weighted Average Exercise Price, Options Outstanding (in dollars per share)	$ 52.34
Options Exercisable [Abstract]
Number Exercisable (in shares)	71,276
Weighted Average Exercise Price, Options Exercisable (in dollars per share)	$ 52.34
2000 Director Plan [Member] \| Third Price Range [Member]
Outstanding and Exercisable Stock options [Abstract]
Range of Exercise Prices, upper limit (in dollars per share)	62.48
Range of Exercise Prices, lower limit (in dollars per share)	$ 61.89
Options Outstanding [Abstract]
Number Outstanding (in shares)	41,153
Weighted Average Remaining Contractual Life	6 years 6 months
Weighted Average Exercise Price, Options Outstanding (in dollars per share)	$ 62.34
Options Exercisable [Abstract]
Number Exercisable (in shares)	41,153
Weighted Average Exercise Price, Options Exercisable (in dollars per share)	$ 62.34
2000 Director Plan [Member] \| Fourth Price Range [Member]
Outstanding and Exercisable Stock options [Abstract]
Range of Exercise Prices, upper limit (in dollars per share)	99.52
Range of Exercise Prices, lower limit (in dollars per share)	$ 75.17
Options Outstanding [Abstract]
Number Outstanding (in shares)	78,000
Weighted Average Remaining Contractual Life	7 years 3 months 18 days
Weighted Average Exercise Price, Options Outstanding (in dollars per share)	$ 88.28
Options Exercisable [Abstract]
Number Exercisable (in shares)	78,000
Weighted Average Exercise Price, Options Exercisable (in dollars per share)	$ 88.28
2000 Director Plan [Member] \| Sixth Price Range [Member]
Outstanding and Exercisable Stock options [Abstract]
Range of Exercise Prices, upper limit (in dollars per share)	99.52
Range of Exercise Prices, lower limit (in dollars per share)	$ 29.60
2000 Director Plan [Member] \| Full Exercise Price Range [Member]
Options Outstanding [Abstract]
Number Outstanding (in shares)	220,429
Weighted Average Remaining Contractual Life	5 years 4 months 24 days
Weighted Average Exercise Price, Options Outstanding (in dollars per share)	$ 64.37
Aggregate Intrinsic Value, Options Outstanding	$ 775,000
Options Exercisable [Abstract]
Number Exercisable (in shares)	220,429
Weighted Average Exercise Price, Options Exercisable (in dollars per share)	$ 64.37
Aggregate Intrinsic Value, Options Exercisable	$ 775,000
Stock Options [Member]
Share-based Compensation Plans Combined Disclosure [Abstract]
Unrecognized compensation cost related to unvested awards	$ 2,956,000
Weighted average period of recognition in years	1 year 2 months 12 days
Fair Value Assumptions [Abstract]
Dividend yield	0.00%	0.00%	0.00%
Average risk-free interest rate	1.30%	2.00%	1.10%
Stock price volatility	33.00%	33.00%	34.00%
Estimated option term	6 years
Stock Options [Member] \| Minimum [Member]
Fair Value Assumptions [Abstract]
Estimated option term		6 years	6 years
Stock Options [Member] \| Maximum [Member]
Fair Value Assumptions [Abstract]
Estimated option term		7 years	7 years
Stock Options [Member] \| Employee Stock Award Plan [Member]
Outstanding Non-Qualified or Nonincentive Stock Awards [Roll Forward]
Outstanding at Period Start, Outstanding Non-Qualified or Nonincentive Stock Awards (in shares)	322,956	379,604	351,173
Granted, Outstanding Non-Qualified or Nonincentive Stock Awards (in shares)	114,894	75,204	111,527
Exercised, Outstanding Non-Qualified or Nonincentive Stock Awards (in shares)	0	(119,276)	(83,096)
Canceled or expired, Outstanding Non-Qualified or Nonincentive Stock Awards (in shares)	(7,418)	(12,576)	0
Outstanding at Period End, Outstanding Non-Qualified or Nonincentive Stock Awards (in shares)	430,432	322,956	379,604
Weighted Average Exercise Price [Abstract]
Outstanding at Period Start, Weighted Average Exercise Price (in dollars per share)	$ 69.95	$ 55.42	$ 45.54
Granted, Weighted Average Exercise Price (in dollars per share)	74.99	98.91	70.94
Exercised, Weighted Average Exercise Price (in dollars per share)	0	42.07	34.51
Canceled or expired, Weighted Average Exercise Price (in dollars per share)	86.28	68.89	0
Outstanding at Period End, Weighted Average Exercise Price (in dollars per share)	$ 71.01	$ 69.95	$ 55.42
Stock Options [Member] \| 2000 Director Plan [Member]
Outstanding Non-Qualified or Nonincentive Stock Awards [Roll Forward]
Outstanding at Period Start, Outstanding Non-Qualified or Nonincentive Stock Awards (in shares)	298,334	320,322	345,938
Granted, Outstanding Non-Qualified or Nonincentive Stock Awards (in shares)	0	42,000	54,958
Exercised, Outstanding Non-Qualified or Nonincentive Stock Awards (in shares)	(77,905)	(63,988)	(80,574)
Outstanding at Period End, Outstanding Non-Qualified or Nonincentive Stock Awards (in shares)	220,429	298,334	320,322
Weighted Average Exercise Price [Abstract]
Outstanding at Period Start, Weighted Average Exercise Price (in dollars per share)	$ 60.01	$ 50.64	$ 45.84
Granted, Weighted Average Exercise Price (in dollars per share)	0	99.52	75.17
Exercised, Weighted Average Exercise Price (in dollars per share)	47.65	39.08	46.75
Outstanding at Period End, Weighted Average Exercise Price (in dollars per share)	$ 64.37	$ 60.01	$ 50.64
Restricted Stock [Member]
Share-based Compensation Plans Combined Disclosure [Abstract]
Unrecognized compensation cost related to unvested awards	$ 16,920,000
Weighted average period of recognition in years	2 years 9 months 18 days

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Tax benefit from restricted stock vesting during the reporting period.

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Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

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Amount of deferred tax expense from write-off of the deferred tax asset related to deductible stock options at exercise.

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Unrecognized cost of unvested share-based compensation awards.

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Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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The total recognized tax benefit related to compensation cost for equity-based payment arrangements recognized in income during the period.

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Estimated period over which an employee is required to provide service in exchange for the equity-based payment award, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period.

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Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event.

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The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

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The weighted average fair value of nonvested awards on equity-based plans excluding option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, revenue or profit achievement stock award plan) for which the employer is contingently obligated to issue equity instruments or transfer assets to an employee who has not yet satisfied service or performance criteria necessary to gain title to proceeds from the sale of the award or underlying shares or units.

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The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period.

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Fair value of share-based awards for which the grantee gained the right by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash.

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The weighted average fair value as of grant date pertaining to an equity-based award plan other than a stock (or unit) option plan for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement.

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The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term.

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The estimated measure of the percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period.

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The risk-free interest rate assumption that is used in valuing an option on its own shares.

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The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable.

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The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.

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Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares.

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The number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan.

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Net number of share options (or share units) granted during the period.

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The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology.

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Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding.

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Number of options outstanding, including both vested and non-vested options.

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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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Weighted average price at which option holders acquired shares when converting their stock options into shares.

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Weighted average price at which grantees could have acquired the underlying shares with respect to stock options that were terminated.

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Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options.

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The floor of a customized range of exercise prices for purposes of disclosing shares potentially issuable under outstanding stock option awards on all stock option plans and other required information pertaining to awards in the customized range.

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The number of shares reserved for issuance pertaining to the outstanding exercisable stock options as of the balance sheet date in the customized range of exercise prices for which the market and performance vesting condition has been satisfied.

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The number of shares reserved for issuance pertaining to the outstanding stock options as of the balance sheet date for all option plans in the customized range of exercise prices.

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The ceiling of a customized range of exercise prices for purposes of disclosing shares potentially issuable under outstanding stock option awards on all stock option plans and other required information pertaining to awards in the customized range.

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Intrinsic value of equity-based compensation awards vested. Excludes stock and unit options.

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Expected term of share-based compensation awards, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of vested portions of options outstanding and currently exercisable.

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Weighted average remaining contractual term for option awards outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Fair value of options vested. Excludes equity instruments other than options, for example, but not limited to, share units, stock appreciation rights, restricted stock.

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Weighted average exercise price as of the balance sheet date for those equity-based payment arrangements exercisable and outstanding.

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The weighted average price as of the balance sheet date at which grantees could acquire the underlying shares with respect to all outstanding stock options which are in the customized range of exercise prices.

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Number of share options (or share units) exercised during the current period.

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