Stockholder's Equity Stockholder's Equity - Quarterly (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	May. 19, 2015
Equity, Class of Stock [Line Items]
Proceeds from Issuance of Preferred Stock, net of issuance costs	$ 117,194
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	998,119
Treasury stock, shares, end of period	36,638,529
Treasury stock, cost, beginning of period	$ 137,356
Shares purchased for minimum tax withholding under the Equity Plan or other similar transactions	4,012	$ 2,777
Purchase of treasury stock, cost	3,570
Treasury stock, cost, end of period	$ 144,938
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	3.58
Treasury stock, average cost per share, end of period, in dollars per share	$ 3.96
Treasury Stock
Treasury Stock, Shares [Roll Forward]
Shares purchased for minimum tax withholding under the Equity Plan or other similar transactions	1,124,676
Shares purchased for minimum tax withholding under the Equity Plan or other similar transactions	$ 4,012
Shares purchased for minimum tax withholding under the Equity Plan or other similar transactions, Average Cost Per Share	$ 3.57
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	$ 1,698