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Deferred compensation (Cash incentive plan) (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended	12 Months Ended
	Mar. 21, 2017	Dec. 31, 2017	Dec. 31, 2018	Dec. 31, 2016
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items]
Service period			4 years
Predecessor
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items]
Outstanding liability accrued			$ 1,327
Cash LTIP
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items]
Cash LTIP expense (net of amounts capitalized)		$ 1,192	543
Cash LTIP grants		5,637	174
Cash LTIP payments		$ 1,285	$ 1,183
Cash LTIP \| Predecessor
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items]
Cash LTIP expense (net of amounts capitalized)	$ 5			$ 696
Cash LTIP grants	0			0
Cash LTIP payments	$ 42			$ 666