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Debt (Schedule of Obligations Under Debt Arrangements) (Details) - USD ($)	Sep. 30, 2020	Jan. 16, 2020	Dec. 31, 2019	Jul. 23, 2015
Debt Instrument [Line Items]
Senior secured credit facility	$ 984,800,000		$ 959,300,000
Unamortized debt issuance expense and discounts (premiums)	28,507,000		30,063,000
Net Value	2,373,928,000		2,469,937,000
Total long-term debt, principal	3,387,235,000		3,459,300,000
Total long-term debt	$ 3,358,728,000		$ 3,429,237,000
6.750% senior unsecured notes due 2022
Debt Instrument [Line Items]
Senior unsecured notes, stated rate	675.00%		675.00%	6.75%
Principal	$ 0		$ 750,000,000
Unamortized debt issuance expense and discounts (premiums)	0		9,349,000
Net Value	$ 0		$ 740,651,000
6.000% senior unsecured notes due 2023
Debt Instrument [Line Items]
Senior unsecured notes, stated rate	600.00%		600.00%
Principal	$ 398,905,000		$ 400,000,000
Unamortized debt issuance expense and discounts (premiums)	2,749,000		3,557,000
Net Value	$ 396,156,000		$ 396,443,000
5.625% senior unsecured notes due 2024
Debt Instrument [Line Items]
Senior unsecured notes, stated rate	562.50%		562.50%
Principal	$ 341,135,000		$ 350,000,000
Unamortized debt issuance expense and discounts (premiums)	3,177,000		3,923,000
Net Value	$ 337,958,000		$ 346,077,000
6.500% senior unsecured notes due 2025
Debt Instrument [Line Items]
Senior unsecured notes, stated rate	650.00%		650.00%
Principal	$ 534,834,000		$ 550,000,000
Unamortized debt issuance expense and discounts (premiums)	5,936,000		7,020,000
Net Value	$ 528,898,000		$ 542,980,000
6.250% senior unsecured notes due 2026
Debt Instrument [Line Items]
Senior unsecured notes, stated rate	625.00%		625.00%
Principal	$ 400,712,000		$ 450,000,000
Unamortized debt issuance expense and discounts (premiums)	4,883,000		6,214,000
Net Value	$ 395,829,000		$ 443,786,000
7.750% senior unsecured notes due 2028
Debt Instrument [Line Items]
Senior unsecured notes, stated rate	775.00%	7.75%	775.00%
Principal	$ 726,849,000	$ 750,000,000.0	$ 0
Unamortized debt issuance expense and discounts (premiums)	11,762,000		0
Net Value	715,087,000		0
Senior Secured Credit Facility
Debt Instrument [Line Items]
Unamortized debt issuance expense and discounts (premiums)	6,900,000		7,600,000
Line of Credit
Debt Instrument [Line Items]
Unamortized debt issuance expense and discounts (premiums)	$ 0		$ 0

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Contractual interest rate for funds borrowed, under the debt agreement.

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