Senior Secured Notes (Details) - USD ($) $ in Thousands				12 Months Ended
	Jul. 01, 2021	Jun. 17, 2020	Aug. 12, 2016	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Senior Notes [Line Items]
Secured Long-term Debt, Noncurrent					$ 460,656
10.0% Senior Secured Notes due 2025 [Member]
Senior Notes [Line Items]
Senior Notes, interest rate, stated percentage		10.00%		10.00%	10.00%
Senior Notes, Principal amount		$ 446,700		$ 446,675	$ 446,675
Senior Notes, unamortized debt discount				30,236	37,943
Unamortized Debt Issuance Expense				8,727	11,558
Secured Long-term Debt, Noncurrent				$ 407,712	$ 397,174
Senior Notes Debt Issuance Costs		13,100
Senior Notes, Initial Fair Value		405,000
1.50% Senior Secured Convertible Notes Due 2021 [Member]
Senior Notes [Line Items]
Senior Notes, interest rate, stated percentage				1.50%	1.50%
Senior Notes, Principal amount				$ 0	$ 65,485
Senior Notes, unamortized debt discount					1,828
Unamortized Debt Issuance Expense					175
Secured Long-term Debt, Noncurrent					63,482
Senior Convertible Notes, interest expense				$ 2,300	7,700
Repayments of Convertible Debt	$ 65,500
Senior Secured Notes
Senior Notes [Line Items]
Senior Notes, Principal amount					512,160
Senior Notes, unamortized debt discount					39,771
Unamortized Debt Issuance Expense					$ 11,733
1.50% Senior Unsecured Convertible Notes Due 2021 [Member]
Senior Notes [Line Items]
Senior Notes, interest rate, stated percentage			1.50%
Senior Notes, Principal amount			$ 172,500
Net proceeds from Convertible Notes Issuance			166,600
Senior Notes Debt Issuance Costs			5,900
Senior Unsecured Convertible Notes, Initial fair value of liability component			$ 132,300
Senior Unsecured Convertible Notes, Effective interest rate			7.25%
Senior Unsecured Convertible Notes, Initial value of equity component			$ 40,200
Capped call, Transaction costs			$ 24,200
Senior Convertible Notes, interest expense						$ 11,000
Senior Unsecured Notes, repurchased, retired or redeemed face amount		107,000
Repayments of Convertible Debt		$ 53,500