Earnings Per Common Share and Share Awards (Details) (USD $)	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Earnings Per Common Share And Share Awards [Line Items]
Incremental dilutive potential common shares, calculated using treasury stock method (in shares)	5,774	20,459	35,090
Anti-dilutive shares excluded from computation of diluted earnings per share	0	0	0
SARs and options vesting period	1 year
Intrinsic values of options exercised	$ 82,000	$ 3,486,000	$ 153,000
Options and SARs vested	4,125
Fair value of options and SARs vested	118,462
Weighted-average fair values for SARs issued (dollars per share)	$ 28.98	$ 27.55	$ 18.84
Compensation expense relating to SARs or options vesting	121,000	84,000	75,000
Total unrecognized compensation cost related to unvested share-based compensation arrangements granted under stock award plans	$ 33,000
Weighted-average period of unrecognized compensation cost recognition	3 months
Number of stock options or SARs granted where exercise price was less than market price on date of grant	0
Minimum
Earnings Per Common Share And Share Awards [Line Items]
Annual rate at which stock appreciation rights and options are exercisable and vest	10.00%
SARs and options expiration period	5 years
Maximum
Earnings Per Common Share And Share Awards [Line Items]
Maximum shares of Company stock to be granted to key employees or directors	500,000
Annual rate at which stock appreciation rights and options are exercisable and vest	20.00%
SARs and options expiration period	10 years

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Number of stock options or SARs granted where exercise price was less than market price on date of grant.

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Share Based Compensation Arrangement By Share Based Payment Award Expiration Period

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Share based compensation arrangement by share based payment award, percentage of exercisable and vesting period

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Share-based Compensation Arrangement by Share-based Payments Award, Options And Equity Instruments Other Than Options Vested In Period

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Share-based Compensation Arrangement by Share-based Payments Award, Options And Equity Instruments Other Than Options Vested In Period, Fair Value

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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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Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

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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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Additional shares included in the calculation of diluted EPS as a result of the potentially dilutive effect of share based payment arrangements using the treasury stock method.

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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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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 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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The number of shares purchased on the open market during the period for issuance to employees under the plan.

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