Long-Term Debt Additional Information (Details) - USD ($)	3 Months Ended	12 Months Ended		60 Months Ended
	Mar. 31, 2021	Nov. 30, 2022	Sep. 15, 2021	May 15, 2026	Apr. 30, 2021	Mar. 15, 2021	Dec. 31, 2020	Jan. 14, 2020	Nov. 14, 2017	Sep. 14, 2016
Debt Instrument
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Long-term Debt							$ 555,500,000
Document Period End Date	Mar. 31, 2021
Line of Credit Facility, Remaining Borrowing Capacity	$ 1,600,000,000
Line of Credit Facility, Current Borrowing Capacity	$ 1,600,000,000
1.125% Convertible Senior Notes due 2021 [Member]
Debt Instrument
Debt Instrument, Interest Rate, Stated Percentage	1.125%
Debt Instrument, Frequency of Periodic Payment	semi-annually
6.125% Senior Notes due 2024 [Member]
Debt Instrument
Debt Instrument, Interest Rate, Stated Percentage	6.125%
Debt Instrument, Frequency of Periodic Payment	semi-annually
6.25% Senior Notes due 2025 [Member]
Debt Instrument
Debt Instrument, Interest Rate, Stated Percentage	6.25%
Debt Instrument, Frequency of Periodic Payment	semi-annually
Senior Notes ($)	$ 102,300,000
5.75% Senior Notes due 2026 [Member]
Debt Instrument
Debt Instrument, Interest Rate, Stated Percentage	5.75%
Debt Instrument, Frequency of Periodic Payment	semi-annually
Senior Notes ($)	$ 750,000,000
1.125% Convertible Senior Notes due 2021 [Member]
Debt Instrument
Convertible senior notes fair value	$ 200,000,000						200,000,000
Convertible Note, Conversion Price	$ 85.39
Unamortized Debt Issuance Expense	$ (447,000)						(691,000)
Debt Issuance Costs, Line of Credit Arrangements, Net	7,300,000						8,100,000
Debt Instrument, Unamortized Discount	4,102,000						6,295,000
Convertible Senior Note, Shares Issued Upon Conversion						11.7113
1.125% Convertible Senior Notes due 2021 [Member] | Forecast
Debt Instrument
Convertible Note Principal Amount						$ 1,000
6.125% Senior Notes due 2024 [Member]
Debt Instrument
Unamortized Debt Issuance Expense	(3,387,000)						(3,632,000)			$ (7,800,000)
Senior Notes ($)	$ 400,000,000						400,000,000
6.125% Senior Notes due 2024 [Member] | 2024 Senior notes redemption price, after September 15, 2020
Debt Instrument
Debt Instrument, Redemption Price, Percentage			103.063%
6.25% Senior Notes due 2025 [Member]
Debt Instrument
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Long-term Debt								$ 555,500,000
Debt Conversion, Original Debt, Interest Rate of Debt	101.00%
Debt Instrument, Repurchased Face Amount	$ 447,700,000
Redemption offer accepted	452,200,000
Debt Instrument, Repurchase Amount	6,200,000
Unamortized Debt Issuance Expense	(837,000)						880,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Liabilities, Long-term Debt								$ 550,000,000
Senior Notes ($)	102,324,000						102,324,000
Debt Instrument, Redemption Price, Percentage		103.125%
5.75% Senior Notes due 2026 [Member]
Debt Instrument
Unamortized Debt Issuance Expense	(6,298,000)						(6,595,000)		$ (7,600,000)
Senior Notes ($)	600,000,000						750,000,000
Debt Instrument, Unamortized Discount	$ 1,368,000						1,429,000
5.75% Senior Notes due 2026 [Member] | 2026 Senior notes redemption price, after to May 15, 2021
Debt Instrument
Debt Instrument, Redemption Price, Percentage				104.313%
5.75% Senior Notes due 2026 [Member] | Issuance of additional aggregate principal for 2026 Senior Notes [Member]
Debt Instrument
Debt Conversion, Original Debt, Interest Rate of Debt	99.00%
Unamortized Debt Issuance Expense	$ (1,800,000)
Senior Notes ($)	150,000,000
Proceeds from Debt, Net of Issuance Costs	146,700,000
Debt Instrument, Unamortized Discount	1,500,000
Revolving Credit Facility
Debt Instrument
Long-term Line of Credit	0						$ 168,000,000
Initial Borrowing Base [Member] | Revolving Credit Facility
Debt Instrument
Line Of Credit Facility Initial Borrowing Capacity	$ 2,500,000,000
Alternate Base Rate Option [Member]
Debt Instrument
Line of Credit Facility, Interest Rate at Period End	0.75%
LIBOR Option [Member]
Debt Instrument
Line of Credit Facility, Interest Rate at Period End	1.75%
Unused Commitment Fee [Member]
Debt Instrument
Line of Credit Facility, Interest Rate at Period End	0.375%
Subsequent Event [Member]
Debt Instrument
Revolving Credit Facility Elected Commitment Amount					$ 1,600,000,000
Line of Credit Facility, Maximum Borrowing Capacity					$ 1,800,000,000