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Long-Term Debt (Details) - USD ($)	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017
Long-term debt
Total long-term debt	$ 1,526,865,000		$ 782,902,000
Loan fees and incurred costs paid during period	15,328,000
Amount of indebtedness repaid	84,945,000	$ 68,342,000
Revolving credit facility
Long-term debt
Long-term debt, current portion	0		0
Total long-term debt	819,061,000		$ 782,902,000
Additional borrowing capacity under the credit agreement after amendment	800,000,000
Loan fees and incurred costs paid during period	800,000	$ 0
Borrowing base availability	273,900,000
Borrowing capacity, subject to covenants	$ 37,000,000
Effective interest rate (as a percent)	4.75%		3.46%
Weighted average interest rate (as a percent)	3.67%	2.98%
Letters of credit	$ 0	$ 0
Senior Notes
Long-term debt
Long-term debt, aggregate principal	725,000,000
Less: deferred financing costs, net of amortization	(17,196,000)
Total long-term debt	707,804,000
Bridge loans, transaction fees	$ 18,400,000
Effective interest rate (as a percent)	6.875%
Deferred finances costs, gross	$ 17,300,000
Senior Notes | Redemption required from hypothetical change of control or ratings decline
Long-term debt
Redemption price (as a percent)	101.00%
Senior Notes | Prior to April 1, 2021
Long-term debt
Principal amount redeemed (as a percent)	35.00%
Redemption price (as a percent)	106.875%
Principal amount of debt outstanding after redemption (as a percent)	65.00%
Redemption within number of days of equity offering	180 days
Senior Notes | Twelve-month period beginning on April 1, 2021
Long-term debt
Redemption price (as a percent)	105.156%
Senior Notes | Twelve-month period beginning on April 1, 2022
Long-term debt
Redemption price (as a percent)	103.438%
Senior Notes | Twelve-month period beginning on April 1, 2023
Long-term debt
Redemption price (as a percent)	101.719%
Senior Notes | April 1, 2024 and at any time thereafter
Long-term debt
Redemption price (as a percent)	100.00%
Other long-term indebtedness | Minimum
Long-term debt
Minimum borrowing availability after amendment	$ 100,000,000
Borrowing base availability	$ 20,000,000

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Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

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Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium.

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