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Stock awards contractual life period.

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Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Cancelled In Period

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Share based compensation arrangement by share based payment award restricted stock unit percentage of grantee earning.

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Stock option and stock appreciation rights contractual life.

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Stock options and stock appreciation rights shares issued.

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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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The amount of expense, net of income tax, 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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The amount of the cost recognized during the period for defined contribution plans.

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Measure of dispersion, in percentage terms (for instance, the standard deviation or variance), for a given stock price.

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Risk-free interest rate assumption used in valuing an instrument.

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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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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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Weighted average remaining contractual term for equity-based awards excluding options, 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 vested during the reporting period.

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Period from grant date that an equity-based award expires, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested).

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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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Number of non-vested options outstanding.

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- Definition

The number of shares authorized to be repurchased by an entity's Board of Directors under a stock repurchase plan.

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The remaining number of shares authorized to be repurchased by an entity's Board of Directors under a stock repurchase plan.

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Employee Benefits and Stock Compensation - Additional Information (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	May 20, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Defined Contribution Plan, Cost Recognized	$ 1,198,000	$ 807,000	$ 771,000
Stock Option And Stock Appreciation Rights Contractual Life	10 years
Repurchase Program Approval Date	Sep. 18, 2001
Stock Repurchase Program, Number of Shares Authorized to be Repurchased					250,000
Stock Repurchase Program, Remaining Number of Shares Authorized to be Repurchased	165,000				237,000
Fair Value Assumptions, Risk Free Interest Rate	2.70%
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period	5 years
Fair Value Assumptions, Expected Volatility Rate	17.00%
Allocated Share-based Compensation Expense	1,299,000	246,000	796,000
Allocated Share-based Compensation Expense, Net of Tax	$ 798,000	$ 151,000	$ 489,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Nonvested, Number of Shares	413,000	49,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value	$ 2.26	$ 3.10
Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share Based Arrangements Share Based Payments Award Stock Awards Contractual Life Period	3 years
Share Based Compensation Arrangement By Share Based Payment Award Restricted Stock Unit Percentage Of Grantee Earning	0.00%
Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share Based Arrangements Share Based Payments Award Stock Awards Contractual Life Period	5 years
Share Based Compensation Arrangement By Share Based Payment Award Restricted Stock Unit Percentage Of Grantee Earning	160.00%
1991 Plan [Member] \| Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized	198,000
1996 Plan [Member] \| Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized	198,000
2000 Plan [Member] \| Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized	264,000
2008 Plan [Member] \| Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized	300,000
2013 Plan [Member] \| Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized	1,300,000
Equity Option [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Nonvested, Number of Shares	392,000
Stock Appreciation Rights (SARs) [Member] \| 1991 Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock Options And Stock Appreciation Rights Shares Issued	166,000
Stock Appreciation Rights (SARs) [Member] \| 1996 Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock Options And Stock Appreciation Rights Shares Issued	187,000
Stock Appreciation Rights (SARs) [Member] \| 2000 Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock Options And Stock Appreciation Rights Shares Issued	158,000
Stock Appreciation Rights (SARs) [Member] \| 2013 Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock Options And Stock Appreciation Rights Shares Issued	462,000
Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period	131,000
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period	120,000
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period	9,000
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number	170,000
Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Cancelled In Period	2,000
Restricted Stock [Member] \| Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Outstanding, Weighted Average Remaining Contractual Terms	3 years
Restricted Stock [Member] \| Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Outstanding, Weighted Average Remaining Contractual Terms	5 years
Restricted Stock [Member] \| 2008 Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period			15,000	229,000
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value			$ 8.10	$ 7.10
Restricted Stock [Member] \| 2013 Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period	28,000	195,000
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value	$ 10.19	$ 11.00
Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period	28,000
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period	14,000
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number	191,000