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Deferred compensation (Cash Incentive Plan) (Details) - The 2015 Cash LTIP - USD ($) $ in Thousands	3 Months Ended			6 Months Ended	9 Months Ended
	Sep. 30, 2017	Mar. 21, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2017	Sep. 30, 2016
Deferred Compensation Arrangement With Individual Excluding Share Based Payments And Postretirement Benefits [Line Items]
Deferred Compensation Arrangement with Individual, Requisite Service Period					4 years
2015 Cash LTIP expense (net of amounts capitalized)	$ 493			$ 1,100
2015 Cash LTIP payments	1,285			1,285
Additional amount awarded	5,637			5,637	$ 5,637
Outstanding liability accrued	$ 1,224			$ 1,224	$ 1,224
Predecessor
Deferred Compensation Arrangement With Individual Excluding Share Based Payments And Postretirement Benefits [Line Items]
2015 Cash LTIP expense (net of amounts capitalized)		$ 5	$ 201			$ 586
2015 Cash LTIP payments		$ 42	$ 624			$ 666