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Stock-Based Compensation Plans (Details) (USD $) | 12 Months Ended | 0 Months Ended | 12 Months Ended | 0 Months Ended |  | 0 Months Ended
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Dec. 31, 2013 plan | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2013 1994 Plan | Dec. 31, 2013 1994 Plan Granted on 3 Feb 2011 | Dec. 31, 2013 1995 Plan Granted on 15 Feb 2011 | Dec. 31, 2013 Stock Bonus Plan | Dec. 31, 2012 Stock Bonus Plan | Dec. 31, 2011 Stock Bonus Plan | Dec. 31, 2013 Restricted Stock Units | Dec. 31, 2012 Restricted Stock Units | Feb. 03, 2014 Restricted Stock Units Subsequent event | Dec. 31, 2013 Non-Qualified Stock Options | Dec. 31, 2012 Non-Qualified Stock Options | Dec. 31, 2013 Unvested Stock Options | Feb. 06, 2013 Independent directors Restricted Stock Units Restrictions lapse (awards vest) on date of award | Feb. 06, 2013 Independent directors Restricted Stock Units Restrictions lapse (awards vest) on first, second and third anniversaries of the date of the award | Feb. 03, 2014 Independent directors Restricted Stock Units Subsequent event | Dec. 31, 2013 Restrictions on awards to certain officers item | Feb. 06, 2013 Restrictions on awards to certain officers Restricted Stock Units Restrictions lapse (awards vest) on the third anniversary of the date of the award | Feb. 06, 2013 Restrictions on awards to certain officers Restricted Stock Units Restrictions lapse (awards vest) on the fourth anniversary of the date of the award
Stock-Based Compensation Plans |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of stock-based incentive plans | 1 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of stock option plans superseded | 2 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock-Based Compensation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of executive officers |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3 |  |
Restricted stock unit activity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Outstanding at the beginning of the period (in shares) |  |  |  |  |  |  |  |  |  | 264,000 |  |  |  |  |  |  |  |  |  |  |
Awarded (in shares) |  |  |  |  |  |  |  |  |  | 359,000 |  | 342,950 |  |  |  |  |  | 9,975 |  |  |
Vested (in shares) |  |  |  |  |  |  |  |  |  | (174,000) |  |  |  |  |  |  |  |  |  |  |
Forfeited (in shares) |  |  |  |  |  |  |  |  |  | (1,000) |  |  |  |  |  |  |  |  |  |  |
Outstanding at the end of the period (in shares) |  |  |  |  |  |  |  |  |  | 448,000 | 264,000 |  |  |  |  |  |  |  |  |  |
Outstanding and expected to vest at the end of the period (in shares) |  |  |  |  |  |  |  |  |  | 436,000 |  |  |  |  |  |  |  |  |  |  |
Weighted-Average Exercise Price |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Outstanding at the beginning of the period (in dollars per share) |  |  |  |  |  |  |  |  |  | $ 33.23 |  |  | $ 31.58 |  |  |  |  |  |  |  |
Awarded (in dollars per share) |  |  |  |  |  |  |  |  |  | $ 31.96 |  |  |  |  |  |  |  | $ 32.60 |  |  |
Vested (in dollars per share) |  |  |  |  |  |  |  |  |  | $ 32.62 |  |  |  |  |  |  |  |  |  |  |
Forfeited (in dollars per share) |  |  |  |  |  |  |  |  |  | $ 32.47 |  |  | $ 40.65 |  |  |  |  |  |  |  |
Outstanding at the end of the period (in dollars per share) |  |  |  |  |  |  |  |  |  | $ 32.48 | $ 33.23 |  | $ 29.35 | $ 31.58 |  |  |  |  |  |  |
Outstanding and expected to vest at the end of the period (in dollars per share) |  |  |  |  |  |  |  |  |  | $ 32.45 |  |  |  |  |  |  |  |  |  |  |
Aggregate Intrinsic Value |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Outstanding at the end of the period (in dollars) |  |  |  |  |  |  |  |  |  | $ 16,447,000 |  |  | $ 7,539,000 | $ 5,347,000 |  |  |  |  |  |  |
Outstanding and expected to vest at end of the period (in dollars) |  |  |  |  |  |  |  |  |  | 16,021,000 |  |  | 7,404,000 |  |  |  |  |  |  |  |
Closing price per share (in dollars per share) |  |  |  |  |  |  |  |  |  | $ 36.73 |  |  |  |  |  |  |  |  |  |  |
Total intrinsic value of awards vested (in dollars) |  |  |  |  |  |  |  |  |  | 5,700,000 | 3,100,000 |  |  |  |  |  |  |  |  |  |
Black-Scholes option pricing model assumptions for options granted |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of Options Granted (in shares) | 0 | 0 |  |  | 1,362,000 | 30,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Risk Free Interest Rate (as a percent) |  |  |  |  | 2.62% | 2.92% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividend Yield (as a percent) |  |  |  |  | 1.75% | 1.76% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Expected Life |  |  |  |  | 6 years 2 months 12 days | 6 years 7 months 6 days |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Volatility (as a percent) |  |  |  |  | 39.00% | 38.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Exercise price for options granted, low end of range (in dollars per share) |  |  |  |  | $ 29.66 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Exercise price for options granted, high end of range (in dollars per share) |  |  |  |  | $ 32.63 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Exercise Price (in dollars per share) |  |  |  |  |  | $ 29.58 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted Average Fair Value (in dollars per share) |  |  |  |  | $ 10.33 | $ 10.49 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Non-Qualified Stock Options activity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Outstanding at the beginning of the period (in shares) |  |  |  |  |  |  |  |  |  |  |  |  | 1,907,000 |  |  |  |  |  |  |  |
Exercised (in shares) |  |  |  |  |  |  |  |  |  |  |  |  | (512,000) |  |  |  |  |  |  |  |
Forfeited (in shares) |  |  |  |  |  |  |  |  |  |  |  |  | (374,000) |  |  |  |  |  |  |  |
Outstanding at the end of the period (in shares) |  |  |  |  |  |  |  |  |  |  |  |  | 1,021,000 | 1,907,000 |  |  |  |  |  |  |
Outstanding and expected to vest at the end of the period (in shares) |  |  |  |  |  |  |  |  |  |  |  |  | 1,003,000 |  |  |  |  |  |  |  |
Exercisable at the end of the period (in shares) |  |  |  |  |  |  |  |  |  |  |  |  | 573,000 |  |  |  |  |  |  |  |
Weighted-Average Exercise Price |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Outstanding at the beginning of the period (in dollars per share) |  |  |  |  |  |  |  |  |  | $ 33.23 |  |  | $ 31.58 |  |  |  |  |  |  |  |
Exercised (in dollars per share) |  |  |  |  |  |  |  |  |  |  |  |  | $ 29.39 |  |  |  |  |  |  |  |
Forfeited (in dollars per share) |  |  |  |  |  |  |  |  |  | $ 32.47 |  |  | $ 40.65 |  |  |  |  |  |  |  |
Outstanding at the end of the period (in dollars per share) |  |  |  |  |  |  |  |  |  | $ 32.48 | $ 33.23 |  | $ 29.35 | $ 31.58 |  |  |  |  |  |  |
Outstanding and expected to vest at end of the period (in dollars per share) |  |  |  |  |  |  |  |  |  |  |  |  | $ 29.35 |  |  |  |  |  |  |  |
Exercisable at end of the period (in dollars per share) |  |  |  |  |  |  |  |  |  |  |  |  | $ 29.14 |  |  |  |  |  |  |  |
Weighted-Average Remaining Contractual Life |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Outstanding at the end of the period |  |  |  |  |  |  |  |  |  |  |  |  | 4 years | 3 years 9 months 18 days |  |  |  |  |  |  |
Outstanding and expected to vest at end of the period |  |  |  |  |  |  |  |  |  |  |  |  | 4 years |  |  |  |  |  |  |  |
Exercisable at end of the period |  |  |  |  |  |  |  |  |  |  |  |  | 3 years 10 months 24 days |  |  |  |  |  |  |  |
Aggregate Intrinsic Value |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Outstanding at the end of the period (in dollars) |  |  |  |  |  |  |  |  |  | 16,447,000 |  |  | 7,539,000 | 5,347,000 |  |  |  |  |  |  |
Outstanding and expected to vest at end of the period (in dollars) |  |  |  |  |  |  |  |  |  | 16,021,000 |  |  | 7,404,000 |  |  |  |  |  |  |  |
Exercisable at end of the period (in dollars) |  |  |  |  |  |  |  |  |  |  |  |  | 4,352,000 |  |  |  |  |  |  |  |
Vesting rights percentage when restrictions lapse |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 25.00% | 25.00% |  |  | 75.00% | 25.00%
Closing price of share (in dollars per share) |  |  |  |  |  |  |  |  |  |  |  |  | $ 36.73 |  |  |  |  |  |  |  |
Total intrinsic value of stock options exercised (in dollars) | 2,600,000 | 1,100,000 | 100,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Granted (in shares) | 0 | 0 |  |  | 1,362,000 | 30,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of Shares, Unvested Stock Options |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unvested at the beginning of the period (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 826,000 |  |  |  |  |  |
Vested (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (377,000) |  |  |  |  |  |
Forfeited (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (1,000) |  |  |  |  |  |
Unvested at the end of the period (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 448,000 |  |  |  |  |  |
Weighted-Average Grant-Date Fair Value, Unvested Stock Options |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unvested at the beginning of the period (in dollars per share) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 10.25 |  |  |  |  |  |
Vested (in dollars per share) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 10.17 |  |  |  |  |  |
Forfeited (in dollars per share) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 10.33 |  |  |  |  |  |
Unvested at the end of the period (in dollars per share) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 10.31 |  |  |  |  |  |
Unrecognized compensation cost and vesting period |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unrecognized compensation costs related to unvested stock-based compensation arrangements | 18,100,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted-average period for recognition of unrecognized stock-based compensation expense | 1 year 6 months |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other disclosures |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares issued and committed to issue |  |  |  |  |  |  | 11,000 | 9,000 | 12,000 |  |  |  |  |  |  |  |  |  |  |  |
Stock-based compensation expense recognized in operating expenses | $ 12,053,000 | $ 10,205,000 | $ 6,133,000 |  |  |  | $ 700,000 | $ 500,000 | $ 700,000 |  |  |  |  |  |  |  |  |  |  |  |
Requisite service period for options to vest |  |  |  | 4 years |  |  | 10 years |  |  |  |  |  |  |  |  |  |  |  |  |  |

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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(3) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2)(iii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The risk-free interest rate assumption that is used in valuing an option on its own shares. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2)(iv) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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