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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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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Amount of stock repurchase plan authorized.

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Number of shares that have been repurchased during the period and have not been retired and are not held in treasury. Some state laws may govern the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock.

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Equity impact of the value of stock that has been repurchased during the period and has not been retired and is not held in treasury. Some state laws may mandate the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock.

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Equity impact of the cost of common and preferred stock that were repurchased during the period. Recorded using the cost method.

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Stockholders' Equity - Narrative (Details) - USD ($)	5 Months Ended	12 Months Ended
Stockholders' Equity - Narrative (Details) - USD ($)	Dec. 31, 2013	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 16, 2014	Aug. 15, 2013	Dec. 03, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Purchase of treasury shares, value		$ 4,943,000		$ 3,884,000
Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based payment award, expiration period		10 years
Share-based payment award, number of shares available for grant (shares)		995,363
Stock Options \| Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based payment award, vesting period		1 year
Stock Options \| Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based payment award, vesting period		3 years
Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based payment award, vesting period		1 year
December 2012 Share Repurchase Agreement
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock repurchase program, authorized amount								$ 10,000,000.0
Purchase of treasury shares (shares)				261,873
Purchase of treasury shares, value				$ 2,600,000
Stock repurchased during period (shares)				302,178	40,305
Stock repurchased during period				$ 3,000,000	$ 400,000
August 2013 Share Repurchase Agreement
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock repurchase program, authorized amount							$ 7,000,000
Purchase of treasury shares (shares)	127,510		0
Purchase of treasury shares, value	$ 1,300,000
December 2014 Share Repurchase Agreement
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock repurchase program, authorized amount						$ 8,000,000
Purchase of treasury shares (shares)		502,077
Purchase of treasury shares, value		$ 4,900,000