Stockholder's Equity - Quarterly (Details) - USD ($) $ / shares in Units, $ in Thousands		3 Months Ended
	May 19, 2015	Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2019	Jun. 26, 2018	Dec. 14, 2017	Mar. 10, 2014
Equity, Class of Stock [Line Items]
Preferred stock dividends declared		$ 1,698	$ 1,698
Convertible Preferred Stock, Shares Issued upon Conversion	38.0619
Convertible Preferred Stock, Threshold Percentage of Stock Price Trigger		150.00%
Treasury Stock, Shares [Roll Forward]
Treasury stock, cost, beginning of period		$ 284,300
Shares purchased for minimum tax withholding under the Equity Plan or other similar transactions		2,825	4,671
Purchase of treasury stock, cost		18,000
Treasury stock, cost, end of period		305,200
Dividends, Cash		$ 1,429
Treasury Stock
Treasury Stock, Shares [Roll Forward]
Treasury stock, shares, beginning of period		18,605,581
Shares purchased for minimum tax withholding under the Equity Plan or other similar transactions		228,557
Treasury stock shares received, other		3,051
Purchase of treasury stock, shares		1,383,657
Treasury stock, shares, end of period		20,220,846
Treasury stock, cost, beginning of period		$ 284,301
Shares purchased for minimum tax withholding under the Equity Plan or other similar transactions		2,825
Treasury stock received, value, other		48
Purchase of treasury stock, cost		18,018
Treasury stock, cost, end of period		$ 305,192
Treasury stock, average cost per share, beginning of period, in dollars per share		$ 15.28
Shares purchased for minimum tax withholding under the Equity Plan or other similar transactions, Average Cost Per Share		12.36
Treasury stock received, per share, other		15.57
Purchase of treasury stock, average cost per share, in dollars per share		13.02
Treasury stock, average cost per share, end of period, in dollars per share		$ 15.09
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		$ 26.27
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		$ 33.54
Convertible Preferred Stock
Equity, Class of Stock [Line Items]
Preferred stock issuance, net of issuance costs, shares	120,750
Preferred Stock, Dividend Rate, Percentage		5.625%
Proceeds from Issuance of Preferred Stock, net of issuance costs		$ 117,200
Adjustments to Additional Paid in Capital, Stock Issued, Issuance Costs		3,600
Preferred Stock, Liquidation Preference Per Share	$ 1,000
Convertible Preferred Stock | Retained Earnings/(Accumulated deficit)
Equity, Class of Stock [Line Items]
Preferred stock dividends declared		1,698	$ 1,698
Convertible Debt
Treasury Stock, Shares [Roll Forward]
Convertible debt, unamortized discount		13,700		$ 14,900
2022 convertible note | Convertible Debt
Treasury Stock, Shares [Roll Forward]
Purchase of treasury stock, cost		$ 19,500
Convertible debt, unamortized discount						$ 23,400	$ 23,400
Option Indexed to Issuer's Equity, Settlement Alternatives, Cash, at Fair Value					$ 29,000