Stockholder's Equity Stockholder's Equity - Quarterly (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended	9 Months Ended
	Sep. 30, 2015	Sep. 30, 2015	Sep. 30, 2014	May. 19, 2015
Equity, Class of Stock [Line Items]
Proceeds from Issuance of Preferred Stock, net of issuance costs		$ 117,194	$ 0
Convertible Preferred Stock, Shares Issued upon Conversion				152.2476
Convertible Preferred Stock, Threshold Percentage of Stock Price Trigger		150.00%
Treasury Stock, Shares [Roll Forward]
Treasury stock, shares, beginning of period		23,507,656
Treasury stock reissued, shares		0
Purchase of treasury stock, shares		7,694,214
Treasury stock, shares, end of period	32,776,819	32,776,819
Treasury stock, cost, beginning of period		$ 79,771
Shares purchased for minimum tax withholding under the Equity Plan or other similar transactions		8,556	$ 5,610
Treasury stock reissued, cost		0
Purchase of treasury stock, cost		41,697
Treasury stock, cost, end of period	$ 130,024	$ 130,024
Treasury stock, average cost per share, beginning of period, in dollars per share		$ 3.39
Treasury stock reissued, average cost per share, in dollars per share		0.00
Purchase of treasury stock, average cost per share, in dollars per share		5.42
Treasury stock, average cost per share, end of period, in dollars per share	$ 3.97	$ 3.97
Treasury Stock
Treasury Stock, Shares [Roll Forward]
Shares purchased for minimum tax withholding under the Equity Plan or other similar transactions		1,574,949
Shares purchased for minimum tax withholding under the Equity Plan or other similar transactions		$ 8,556
Shares purchased for minimum tax withholding under the Equity Plan or other similar transactions, Average Cost Per Share		$ 5.43
Call Option
Equity, Class of Stock [Line Items]
Option indexed to Issuer's Equity, Value				$ 15,900
Minimum
Equity, Class of Stock [Line Items]
Convertible Preferred Stock, Threshold Consecutive Trading Days		20 days
Minimum | Call Option
Equity, Class of Stock [Line Items]
Option Indexed to Issuer's Equity, Strike Price		$ 6.57
Maximum
Equity, Class of Stock [Line Items]
Convertible Preferred Stock, Threshold Consecutive Trading Days		30 days
Maximum | Call Option
Equity, Class of Stock [Line Items]
Option Indexed to Issuer's Equity, Strike Price		$ 8.39
Cumulative Preferred Stock
Equity, Class of Stock [Line Items]
Preferred stock issuance, net of issuance costs		120,750
Convertible Preferred Stock
Equity, Class of Stock [Line Items]
Adjustments to Additional Paid in Capital, Stock Issued, Issuance Costs		$ 3,400
Preferred Stock, Dividend Rate, Percentage		5.625%
Dividends	$ 1,600	$ 2,400
Preferred Stock, Liquidation Preference Per Share				$ 1,000