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Indebtedness and Credit Agreement - Transactions and Maturity (Details) - USD ($) $ in Thousands									1 Months Ended
	Jun. 25, 2020	Feb. 19, 2020	Oct. 11, 2019	Jun. 25, 2018	May 21, 2018	Apr. 29, 2018	Apr. 19, 2018	Apr. 12, 2018	Nov. 30, 2019	May 30, 2020	Feb. 29, 2020	Feb. 05, 2020	Jan. 06, 2020	Oct. 15, 2019	Dec. 20, 2018	Apr. 28, 2018
Indebtedness and credit agreements
Amount of receivables sold under Receivable Purchase Agreement		$ 501,422
Receipts from sale of receivables		$ 449,949
Maturities
2021										$ 0
2022										0
2023										0
2024										2,495,490
2024										0
thereafter										$ 866,387
9.25% senior notes due March 2020
Indebtedness and credit agreements
Gain (loss) on debt retirements, net								$ (3,422)
Debt instrument, stated interest rate (as a percent)								9.25%
Percentage of outstanding principal amount redeemed								100.00%
6.75% and 6.125% senior notes \| Maximum
Indebtedness and credit agreements
Notes redeemed and discharged							$ 700,000
6.75% senior notes due June 2021
Indebtedness and credit agreements
Notes redeemed and discharged				$ 805,169	$ 1,360
Gain (loss) on debt retirements, net				$ (18,075)	$ (8)
Debt instrument, stated interest rate (as a percent)				6.75%	6.75%		6.75%
6.125% senior notes due April 2023
Indebtedness and credit agreements
Notes redeemed and discharged					$ 4,759
Gain (loss) on debt retirements, net					$ (56)
Debt instrument, stated interest rate (as a percent)					6.125%		6.125%			6.125%	6.125%	6.125%	6.125%
Face amount of debt repurchased												$ 600,000	$ 600,000
Principal amount of debt										$ 1,153,490	$ 1,153,490
6.125% senior notes due April 2023 \| Subsequent Event
Indebtedness and credit agreements
Notes redeemed and discharged	$ 750,000
Debt instrument, stated interest rate (as a percent)	6.125%
Issuance of debt	$ 145,500
Senior Notes 7.70 Percent And 6.875 Percent [Member]
Indebtedness and credit agreements
Notes redeemed and discharged			$ 84,097
Gain (loss) on debt retirements, net			32,416						$ 18,510
Early redemption of debt			$ 51,300						38,392
Senior Notes 7.70 Percent And 6.875 Percent [Member] \| Maximum
Indebtedness and credit agreements
Face amount of debt repurchased														$ 100,000
6.875% fixed-rate senior notes due December 2028
Indebtedness and credit agreements
Notes redeemed and discharged									$ 39,441
Debt instrument, stated interest rate (as a percent)			6.875%						6.875%	6.875%	6.875%			6.875%
Principal amount of debt										$ 29,001	$ 29,001
7.7% notes due February 2027
Indebtedness and credit agreements
Notes redeemed and discharged									$ 18,075
Gain (loss) on debt retirements, net									$ 4,766
Debt instrument, stated interest rate (as a percent)			7.70%						7.70%	7.70%	7.70%			7.70%
Face amount of debt repurchased									$ 15,000
Amount of debt repurchased									$ 10,012
Principal amount of debt										$ 237,386	$ 237,386
7.5% senior notes due July 2025
Indebtedness and credit agreements
Debt instrument, stated interest rate (as a percent)										7.50%	7.50%	7.50%	7.50%
Principal amount of debt										$ 600,000	$ 600,000
7.5% senior notes due July 2025 \| Subsequent Event
Indebtedness and credit agreements
Debt instrument, stated interest rate (as a percent)	7.50%
8.0% senior secured notes due 2026 \| Subsequent Event
Indebtedness and credit agreements
Debt instrument, stated interest rate (as a percent)	8.00%
Principal amount of debt	$ 600,000
Senior secured revolving credit facility due December 2023
Indebtedness and credit agreements
Maximum borrowing capacity															$ 2,700,000
Principal amount of debt										$ 892,000	$ 650,000
Senior secured revolving credit facility due January 2020
Indebtedness and credit agreements
Maximum borrowing capacity						$ 2,700,000									$ 2,700,000	$ 3,000,000
Gain (loss) on debt retirements, net						$ (1,091)