Stockholders Equity - (Details) $ / shares in Units, $ in Thousands		3 Months Ended
	May 19, 2015 USD ($) $ / shares shares	Mar. 31, 2021 USD ($) class $ / shares shares	Mar. 31, 2020 USD ($)	Dec. 31, 2020 USD ($) $ / shares shares	Jun. 26, 2018 USD ($)	Dec. 14, 2017 USD ($)
Equity, Class of Stock [Line Items]
Common stock, shares authorized | shares		125,000,000
Preferred stock, shares authorized | shares		10,000,000		10,000,000
Preferred stock, par value (in dollars per share) | $ / shares		$ 0.01		$ 0.01
Number of classes | class		2
Preferred stock dividends declared		$ 1,698	$ 1,698
Convertible Preferred Stock, Shares Issued upon Conversion | shares	38.0619
Convertible Preferred Stock, Threshold Percentage of Stock Price Trigger		150.00%
Dividends, Cash		$ 2,777	1,429
Treasury Stock, Cost [Roll Forward]
Treasury stock, cost, beginning of period		346,900
Shares purchased for minimum tax withholding under the Equity Plan or other similar transactions		6,245	2,825
Purchase of treasury stock, cost		20,600
Treasury stock, cost, end of period		373,800
Dividend Paid
Equity, Class of Stock [Line Items]
Dividends, Cash		$ 2,300
Treasury Stock
Treasury Stock, Shares [Roll Forward]
Treasury stock, shares, beginning of period | shares		22,619,863
Shares purchased for minimum tax withholding under the Equity Plan or other similar transactions | shares		148,752
Treasury stock shares received, other | shares		1,155
Purchase of treasury stock, shares | shares		605,703
Treasury stock, shares, end of period | shares		23,375,473
Treasury Stock, Cost [Roll Forward]
Treasury stock, cost, beginning of period		$ 346,870
Shares purchased for minimum tax withholding under the Equity Plan or other similar transactions		6,246
Treasury stock received, value, other		29
Purchase of treasury stock, cost		20,629
Treasury stock, cost, end of period		$ 373,774
Treasury Stock, Average Cost Per Share [Roll Forward]
Treasury stock, average cost per share, beginning of period, in dollars per share | $ / shares		$ 15.33
Shares purchased for minimum tax withholding under the Equity Plan or other similar transactions, Average Cost Per Share | $ / shares		41.99
Treasury stock received, per share, other | $ / shares		25.33
Purchase of treasury stock, average cost per share, in dollars per share | $ / shares		34.06
Treasury stock, average cost per share, end of period, in dollars per share | $ / shares		$ 15.99
Additional Paid-in Capital | Convertible Debt
Equity, Class of Stock [Line Items]
Embedded Derivative, No Longer Bifurcated, Amount Reclassified to Stockholders' Equity		$ 29,600
Convertible Preferred Stock
Equity, Class of Stock [Line Items]
Stock Issued During Period, Shares, Other | 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 | $ / shares	$ 1,000
Convertible Preferred Stock, Shares Issued upon Conversion | shares				38.488
Convertible Preferred Stock | Retained Earnings/(Accumulated deficit)
Equity, Class of Stock [Line Items]
Preferred stock dividends declared		$ 1,698	1,698
Common Stock Class A
Equity, Class of Stock [Line Items]
Common stock, shares authorized | shares		62,500,000		62,500,000
Common stock, par value (in dollars per share) | $ / shares		$ 0.01		$ 0.01
Treasury Stock, Shares [Roll Forward]
Treasury stock, shares, beginning of period | shares		22,619,863
Treasury stock, shares, end of period | shares		23,375,473
Treasury Stock, Cost [Roll Forward]
Treasury stock, cost, beginning of period		$ 346,870
Treasury stock, cost, end of period		373,774
Common Stock Class A | Retained Earnings/(Accumulated deficit)
Equity, Class of Stock [Line Items]
Dividends, Cash		$ 2,777	$ 1,429
Common Stock Class B
Equity, Class of Stock [Line Items]
Common stock, shares authorized | shares		62,500,000		62,500,000
Common stock, par value (in dollars per share) | $ / shares		$ 0.01		$ 0.01
Maximum
Equity, Class of Stock [Line Items]
Convertible Preferred Stock, Threshold Consecutive Trading Days		30 days
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 | $ / shares		$ 26.27
Convertible Debt
Equity, Class of Stock [Line Items]
Unamortized discount		$ 5,800		$ 6,700
Convertible Debt | 2022 convertible note
Equity, Class of Stock [Line Items]
Unamortized discount						$ 23,400
Option Indexed to Issuer's Equity, Settlement Alternatives, Cash, at Fair Value					$ 29,000
Embedded Derivative, No Longer Bifurcated, Amount Reclassified to Stockholders' Equity		$ 29,600