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Long-term debt - Schedule of Long-Term Debt (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Feb. 11, 2020	Dec. 31, 2019
Debt Instrument [Line Items]
Total principal long-term debt	$ 4,100,000		$ 4,203,000
Debt issuance costs	(34,389)		(26,873)
Unamortized premiums and discounts, net	6,286		3,118
Total long-term debt	4,071,897		4,179,245
Unsecured floating rate term loan due quarterly through June 2020
Debt Instrument [Line Items]
Total principal long-term debt	10,000		20,000
Unsecured floating rate term loan due quarterly through September 2020
Debt Instrument [Line Items]
Total principal long-term debt	90,000		105,000
Unsecured notes bearing fixed rate interest at 5.125% due July 2020
Debt Instrument [Line Items]
Total principal long-term debt	$ 0		310,000
Stated interest rate (as a percent)	5.125%	5.125%
Unsecured notes bearing fixed rate interest at 4.875% due September 2021
Debt Instrument [Line Items]
Total principal long-term debt	$ 350,000		350,000
Stated interest rate (as a percent)	4.875%
Unsecured notes bearing fixed rate interest at 6.375% due October 2023
Debt Instrument [Line Items]
Total principal long-term debt	$ 0		650,000
Stated interest rate (as a percent)	6.375%	6.375%
Borrowings under revolving credit agreement expiring August 2024
Debt Instrument [Line Items]
Total principal long-term debt	$ 785,000		903,000
Unsecured notes bearing fixed rate interest at 5.50% due September 2024
Debt Instrument [Line Items]
Total principal long-term debt	$ 325,000		325,000
Stated interest rate (as a percent)	5.50%
Unsecured notes bearing fixed rate interest at 7.75% due June 2027
Debt Instrument [Line Items]
Total principal long-term debt	$ 200,000		200,000
Stated interest rate (as a percent)	7.75%
Unsecured notes bearing fixed rate interest at 7.25% due September 2027
Debt Instrument [Line Items]
Total principal long-term debt	$ 240,000		240,000
Stated interest rate (as a percent)	7.25%
Unsecured notes bearing fixed rate interest at 4.625% due March 2028
Debt Instrument [Line Items]
Total principal long-term debt	$ 1,000,000		0
Stated interest rate (as a percent)	4.625%
Unsecured notes bearing fixed rate interest at 5.00% due September 2029
Debt Instrument [Line Items]
Total principal long-term debt	$ 1,100,000		$ 1,100,000
Stated interest rate (as a percent)	5.00%