Long-Term Debt (Details) - USD ($) $ in Thousands					3 Months Ended			6 Months Ended
	Jul. 29, 2021	Jul. 01, 2021	Jun. 23, 2021	Jun. 17, 2020	Jun. 30, 2021	Jun. 30, 2020	Mar. 31, 2020	Jun. 30, 2021	Jun. 30, 2020	Jul. 21, 2021	Dec. 31, 2020
Long-Term Debt [Line Items]
Revolving credit facility					$ 52,500			$ 52,500			$ 93,000
Secured Long-term Debt, Noncurrent					467,807			467,807			460,656
Unsecured Long-term Debt, Noncurrent					1,671,818			1,671,818			1,660,663
Total long-term debt, net					2,192,125			2,192,125			2,214,319
Gain (loss) on extinguishment of debt					(2,144)	$ 227,281		$ (2,144)	$ 239,476
Debt Instrument, Covenant Compliance								The Company was in compliance with all covenants under the Credit Agreement and the indentures governing the Senior Notes as of June 30, 2021, and through the filing of this report.
Capitalized interest costs					4,700	4,100		$ 9,000	$ 6,800
6.5% Senior Unsecured Notes Due 2028 [Member]
Long-Term Debt [Line Items]
Unsecured Long-term Debt, Noncurrent					392,837			392,837			0
Senior Unsecured Notes, Principal amount			$ 400,000		$ 400,000			$ 400,000			0
Debt Instrument, Maturity Date			Jul. 15, 2028
Senior Notes, interest rate, stated percentage			6.50%		6.50%			6.50%
Proceeds from Debt, Net of Issuance Costs			$ 392,800
Senior Secured Notes, Debt Issuance Costs, Gross			7,200
6.125% Senior Unsecured Notes due 2022 [Member]
Long-Term Debt [Line Items]
Unsecured Long-term Debt, Noncurrent					$ 0			$ 0			211,548
Senior Unsecured Notes, Principal amount					$ 0			$ 0			$ 212,403
Senior Notes, interest rate, stated percentage					6.125%			6.125%			6.125%
Senior Unsecured Notes, exchanged or repurchased face amount			193,100		$ 19,300		$ 40,700	$ 19,300
Senior Unsecured Notes, repurchased settlement amount							28,300
Gain (loss) on extinguishment of debt							12,200
Discount realized on extinguishment of debt							(12,400)
6.125% Senior Unsecured Notes due 2022 [Member] | Accelerated unamortized deferred financing costs [Member]
Long-Term Debt [Line Items]
Write off of Deferred Debt Issuance Cost							$ 235
5.0% Senior Unsecured Notes due 2024 [Member]
Long-Term Debt [Line Items]
Unsecured Long-term Debt, Noncurrent					104,270			104,270			$ 275,458
Senior Unsecured Notes, Principal amount					$ 104,769			$ 104,769			$ 277,034
Senior Notes, interest rate, stated percentage					5.00%			5.00%			5.00%
Senior Unsecured Notes, exchanged or repurchased face amount			$ 172,300
6.125% Senior Unsecured Notes Due 2022 and 5.0% Senior Unsecured Notes Due 2024 [Member]
Long-Term Debt [Line Items]
Senior Unsecured Notes, repurchased settlement amount					$ 385,300			$ 385,300
Gain (loss) on extinguishment of debt					(2,100)
Debt Instrument, Repurchase Premium					600
6.125% Senior Unsecured Notes Due 2022 and 5.0% Senior Unsecured Notes Due 2024 [Member] | Accelerated unamortized deferred financing costs [Member]
Long-Term Debt [Line Items]
Write off of Deferred Debt Issuance Cost					1,500
1.50% Senior Secured Convertible Notes Due 2021 [Member]
Long-Term Debt [Line Items]
Secured Long-term Debt, Noncurrent					65,485			65,485			$ 63,482
Senior Unsecured Notes, Principal amount					$ 65,485			$ 65,485			$ 65,485
Senior Notes, interest rate, stated percentage					1.50%			1.50%			1.50%
10.0% Senior Secured Notes due 2025 [Member]
Long-Term Debt [Line Items]
Secured Long-term Debt, Noncurrent					$ 402,322			$ 402,322			$ 397,174
Senior Unsecured Notes, Principal amount				$ 446,700	$ 446,675			$ 446,675			$ 446,675
Senior Notes, interest rate, stated percentage					10.00%			10.00%			10.00%
Senior Unsecured Notes [Member]
Long-Term Debt [Line Items]
Senior Unsecured Notes, Principal amount					$ 1,689,913			$ 1,689,913			$ 1,674,581
Senior Unsecured Notes, exchanged or repurchased face amount				$ 611,900
Senior Unsecured Notes [Member] | Accelerated unamortized deferred financing costs [Member]
Long-Term Debt [Line Items]
Write off of Deferred Debt Issuance Cost						5,600
1.50% Senior Unsecured Convertible Notes Due 2021 [Member]
Long-Term Debt [Line Items]
Senior Notes, interest rate, stated percentage				1.50%
Senior Unsecured Notes, exchanged or repurchased face amount				$ 107,000
Repayment of 1.50% Senior Convertible Notes due 2021				$ 53,500
Senior Secured Notes, Senior Unsecured Notes, and 1.50% Senior Unsecured Convertible Notes Due 2021
Long-Term Debt [Line Items]
Gain (loss) on extinguishment of debt						227,300
Senior Unsecured Notes and 1.50% Senior Unsecured Convertible Notes Due 2021 | Accelerated Unamortized Debt Discount
Long-Term Debt [Line Items]
Write off of Deferred Debt Issuance Cost						$ 6,100
Subsequent Event [Member]
Long-Term Debt [Line Items]
Debt Instrument, Covenant Compliance	The Company was in compliance with all covenants under the Credit Agreement and the indentures governing the Senior Notes as of June 30, 2021, and through the filing of this report.
Subsequent Event [Member] | 1.50% Senior Secured Convertible Notes Due 2021 [Member]
Long-Term Debt [Line Items]
Repayment of 1.50% Senior Convertible Notes due 2021		$ 65,500
Revolving Credit Facility [Member]
Long-Term Debt [Line Items]
Revolving credit facility					$ 52,500			$ 52,500			$ 93,000
Revolving Credit Facility [Member] | Subsequent Event [Member]
Long-Term Debt [Line Items]
Revolving credit facility										$ 99,000