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Stock-Based Compensation - Narrative (Details) (USD $)	12 Months Ended
Stock-Based Compensation - Narrative (Details) (USD $)	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2007 2005 Stock Plan [Member]	Dec. 31, 2013 2011 Equity Incentive Award Plan [Member]	Dec. 31, 2012 2011 Equity Incentive Award Plan [Member]	May 09, 2011 2011 Equity Incentive Award Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares authorized for issue (in shares)				2,500,000			3,000,000
Shares available for future issuance (in shares)					2,685,029	2,689,490
Share-based compensation cost	$ 5,689,000	$ 4,327,000	$ 530,000
Share-based compensation cost, tax benefit recognized in income	$ 2,100,000	$ 1,600,000	$ 189,000

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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- Definition

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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