Long-Term Debt Additional Information (Details) - USD ($) $ / shares in Units, $ in Thousands	6 Months Ended
	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Nov. 14, 2017	Sep. 14, 2016
Debt Instrument
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Long-term Debt	$ 555,500
Document Period End Date	Jun. 30, 2020
Line of Credit Facility, Initial Borrowing Base	$ 2,100,000
Revolving Credit Facility Elected Commitment Amount	1,700,000	$ 1,700,000
Debt Issuance Costs, Line of Credit Arrangements, Net	$ 10,100		$ 8,900
Line of Credit Facility, Weighted Average Interest Rate	2.00%
6.25% Senior Notes due 2025 [Member]
Debt Instrument
Debt Instrument, Interest Rate, Stated Percentage	6.25%
Senior Notes ($)	$ 102,300
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 ($)	$ 600,000
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%
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
Debt Conversion, Original Debt, Interest Rate of Debt	101.00%
Debt Instrument, Repurchased Face Amount	$ 447,700
Redemption offer accepted	452,200
Debt Instrument, Repurchase Amount	6,200
Unamortized Debt Issuance Expense	(956)		0
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Liabilities, Long-term Debt	550,000
Senior Notes ($)	102,324		0
5.75% Senior Notes due 2026 [Member]
Debt Instrument
Unamortized Debt Issuance Expense	(5,287)		(5,734)	$ (7,600)
Senior Notes ($)			600,000
Maximum Borrowing Base [Member] | Revolving Credit Facility
Debt Instrument
Line of Credit Facility, Maximum Borrowing Capacity	2,500,000
Revolving Credit Facility
Debt Instrument
Long-term Line of Credit	653,000		4,000
1.125% Convertible Senior Notes due 2021 [Member]
Debt Instrument
Convertible senior notes fair value	$ 200,000		200,000
Convertible Note, Conversion Price	$ 85.39
Liability component of gross proceeds of Convertible Notes	$ 160,500
Debt Instrument, Convertible, Carrying Amount of Equity Component	39,500
Unamortized Debt Issuance Expense	(1,178)		(1,666)		$ (4,800)
6.125% Senior Notes due 2024 [Member]
Debt Instrument
Unamortized Debt Issuance Expense	(4,121)		(4,611)		$ (7,800)
Senior Notes ($)	$ 400,000		$ 400,000
Alternate Base Rate Option [Member]
Debt Instrument
Line of Credit Facility, Interest Rate at Period End	1.00%
LIBOR Option [Member]
Debt Instrument
Line of Credit Facility, Interest Rate at Period End	2.00%
Unused Commitment Fee [Member]
Debt Instrument
Line of Credit Facility, Interest Rate at Period End	0.375%