Long-Term Debt (Details) - USD ($) $ in Thousands				3 Months Ended				9 Months Ended
	Oct. 28, 2021	Jun. 23, 2021	Jun. 17, 2020	Sep. 30, 2021	Jun. 30, 2021	Sep. 30, 2020	Jun. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Oct. 21, 2021	Dec. 31, 2020
Long-Term Debt [Line Items]
Revolving credit facility				$ 0				$ 0			$ 93,000
Secured Long-term Debt, Noncurrent				405,007				405,007			460,656
Unsecured Long-term Debt, Noncurrent				1,672,623				1,672,623			1,660,663
Total long-term debt, net				2,077,630				2,077,630			2,214,319
Gain (loss) on extinguishment of debt				5		$ 25,070		$ (2,139)	$ 264,546
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 September 30, 2021, and through the filing of this report.
Capitalized interest costs				3,500		4,800		$ 12,500	11,600
6.5% Senior Unsecured Notes Due 2028
Long-Term Debt [Line Items]
Unsecured Long-term Debt, Noncurrent				393,067				393,067			0
Senior Notes, Principal amount		$ 400,000		$ 400,000				$ 400,000			$ 0
Senior Notes, interest rate, stated percentage		6.50%		6.50%				6.50%			6.50%
Debt Instrument, Maturity Date		Jul. 15, 2028
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
Long-Term Debt [Line Items]
Unsecured Long-term Debt, Noncurrent				$ 0				$ 0			$ 211,548
Senior 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	103,200			103,200
5.0% Senior Unsecured Notes due 2024
Long-Term Debt [Line Items]
Unsecured Long-term Debt, Noncurrent				$ 104,318				$ 104,318			$ 275,458
Senior 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				29,000			29,000
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	94,200			94,200
Gain (loss) on extinguishment of debt					(2,100)	25,100			37,300
Debt Instrument, Repurchase Premium					600
Discount realized on extinguishment of debt						(25,500)			(37,900)
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	$ 500			$ 700
1.50% Senior Unsecured Convertible Notes Due 2021 [Member]
Long-Term Debt [Line Items]
Senior Notes, interest rate, stated percentage						1.50%			1.50%
Senior Unsecured Notes, exchanged or repurchased face amount			$ 107,000
Repayment of 1.50% Senior Convertible Notes due 2021			53,500
10.0% Senior Secured Notes due 2025
Long-Term Debt [Line Items]
Secured Long-term Debt, Noncurrent				$ 405,007				$ 405,007			$ 397,174
Senior 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 Notes, Principal amount				$ 1,689,913				$ 1,689,913			$ 1,674,581
Senior Unsecured Notes, exchanged or repurchased face amount			$ 611,900
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 Secured Notes, Senior Unsecured Notes, and 1.50% Senior Unsecured Convertible Notes Due 2021 | Accelerated unamortized deferred financing costs [Member]
Long-Term Debt [Line Items]
Write off of Deferred Debt Issuance Cost							5,600
Senior Secured Notes, 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
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 September 30, 2021, and through the filing of this report.
Revolving Credit Facility [Member]
Long-Term Debt [Line Items]
Revolving credit facility				$ 0				$ 0			$ 93,000
Revolving Credit Facility [Member] | Subsequent Event
Long-Term Debt [Line Items]
Revolving credit facility										$ 0