Stockholder's Equity Stockholder's Equity - Quarterly (Details) - USD ($) $ / shares in Units, $ in Thousands		6 Months Ended
	May 19, 2015	Jun. 30, 2016	Jun. 30, 2015
Equity, Class of Stock [Line Items]
Proceeds from Issuance of Preferred Stock, net of issuance costs		$ 0	$ 117,310
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		34,515,734
Purchase of treasury stock, shares		1,723,119
Treasury stock, shares, end of period		38,749,780
Treasury stock, cost, beginning of period		$ 137,356
Shares purchased for minimum tax withholding under the Equity Plan or other similar transactions		8,562	8,520
Purchase of treasury stock, cost		6,014
Treasury stock, cost, end of period		$ 151,932
Treasury stock, average cost per share, beginning of period, in dollars per share		$ 3.98
Purchase of treasury stock, average cost per share, in dollars per share		3.49
Treasury stock, average cost per share, end of period, in dollars per share		$ 3.92
Treasury Stock
Treasury Stock, Shares [Roll Forward]
Shares purchased for minimum tax withholding under the Equity Plan or other similar transactions		2,510,927
Shares purchased for minimum tax withholding under the Equity Plan or other similar transactions		$ 8,562
Shares purchased for minimum tax withholding under the Equity Plan or other similar transactions, Average Cost Per Share		$ 3.41
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
Convertible Preferred Stock
Equity, Class of Stock [Line Items]
Preferred stock issuance, net of issuance costs	120,750
Adjustments to Additional Paid in Capital, Stock Issued, Issuance Costs		$ 3,400
Preferred Stock, Dividend Rate, Percentage		5.625%
Preferred Stock, Liquidation Preference Per Share	$ 1,000
Convertible Preferred Stock | Retained Earnings [Member]
Equity, Class of Stock [Line Items]
Dividends		$ 3,396	$ 755