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Interest expense (Details) - USD ($) $ in Thousands		1 Months Ended	5 Months Ended	6 Months Ended		7 Months Ended	12 Months Ended
	Aug. 11, 2015	Aug. 14, 2015	Dec. 31, 2015	Jun. 30, 2018	Jun. 30, 2017	Aug. 14, 2015	Dec. 31, 2017	Dec. 31, 2016	Nov. 20, 2012
Debt Instrument [Line Items]
Interest incurred on debt			$ 7,694	$ 35,473	$ 12,086		$ 24,060	$ 20,408
Accretion of fair value adjustment on Senior Notes		$ 268	2,305	357	0		6,454	6,305
Amortization of debt issuance costs				1,416	154		309	201
Total interest expense			$ 9,999	$ 66,532	15,448		$ 30,823	$ 26,914
Effective interest rate, revolving credit facility				5.59%			4.57%	5.52%
Stated interest rate							6.375%
Subordinated Borrowing, Interest Rate							7.00%
Accelerated amortization on prepaid of Senior Subordinated Notes	$ 4,500			$ (23,827)	$ 0
Predecessor [Member]
Debt Instrument [Line Items]
Interest incurred on debt						$ 12,066
Amortization of discount on Senior Subordinated Notes						12,027
Amortization of debt issuance costs						2,118
Total interest expense						$ 26,211
Senior Notes
Debt Instrument [Line Items]
Stated interest rate							6.375%		6.375%

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Amount recognized for the passage of time, typically for liabilities, that have been discounted to their net present values. Excludes accretion associated with asset retirement obligations.

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Amount of noncash expense included in interest expense to amortize debt discount and premium associated with the related debt instruments. Excludes amortization of financing costs. Alternate captions include noncash interest expense.

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Contractual interest rate for funds borrowed, under the debt agreement.

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Difference between the fair value of payments made and the carrying amount of debt which is extinguished prior to maturity.

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