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Face amount or stated value per share of common stock.

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Face amount or stated value per share of preferred stock nonredeemable or redeemable solely at the option of the issuer.

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The maximum number of nonredeemable preferred shares (or preferred stock redeemable solely at the option of the issuer) permitted to be issued by an entity's charter and bylaws.

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Capital Stock Capital Stock (Details) (USD $)	12 Months Ended		0 Months Ended
Capital Stock Capital Stock (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2012	Jun. 12, 2012	Dec. 31, 2013	Dec. 19, 2011	Apr. 10, 2013
Capital Stock
Authorized shares of capital stock	105,000,000
Authorized shares of common stock	100,000,000us-gaap_CommonStockSharesAuthorized			100,000,000us-gaap_CommonStockSharesAuthorized
Common stock, par value (usd per share)	$ 0.01			$ 0.01
Authorized shares of preferred stock	5,000,000us-gaap_PreferredStockSharesAuthorized			5,000,000us-gaap_PreferredStockSharesAuthorized
Preferred stock, par value (usd per share)	$ 0.001			$ 0.001
Common stock reserved for future issuance (shares)	3,400,000
Repurchase of common stock	$ 1,628,000	$ 18,936,000
Shares under the 2009 Stock Incentive Plan
Capital Stock
Common stock reserved for future issuance (shares)	3,308,000
Shares under the Employee Stock Purchase Plan
Capital Stock
Common stock reserved for future issuance (shares)	92,000
December 2011 Repurchase Program
Capital Stock
Common stock authorized for repurchase					20,000,000
Common stock repurchased and retired, shares			2,200,000
Treasury Stock Acquired, Average Cost Per Share			$ 8.94
Repurchase of common stock		20,000,000
Stock Repurchased, Percentage of Common Stock Outstanding		6.50%
April 2013 Repurchase Program
Capital Stock
Common stock authorized for repurchase						20,000,000
Common stock repurchased and retired, shares	120,557
Repurchase of common stock	$ 1,600,000