Equity-Based Compensation - Summary of Status of Stock Options (Details 5) (Stock Options [Member], USD $)	12 Months Ended
Dec. 31, 2014
Stock Options [Member]
Summary of Status of Stock Options
Outstanding, Options at beginning of year	123,000
Exercised, Options	(115,100)
Expired, Options	(2,700)
Outstanding, Options at end of period	5,200
Exercisable, Options at end of period	5,200
Outstanding, Weighted - Average Exercise Price at beginning of year	$ 12.78
Exercised, Weighted - Average Exercise Price	$ 12.84
Expired, Weighted - Average Exercise Price	$ 11.04
Outstanding, Weighted - Average Exercise Price at end of period	$ 12.35
Exercisable, Weighted - Average Exercise Price at end of period	$ 12.35
Additional Disclosure Status of Stock Options
Intrinsic values of share options exercised	$ 831,000
Weighted average remaining contractual life	10 months 24 days
Outstanding, Aggregate intrinsic Value at beginning of period	$ 29,000

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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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The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock 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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Number of options or other stock instruments for which the right to exercise has lapsed under the terms of the plan agreements.

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

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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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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 of the plan that expired.

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

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