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Deferred compensation (Cash Awards) (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended	12 Months Ended
	Mar. 21, 2017	Dec. 31, 2017	Dec. 31, 2019	Dec. 31, 2018
Tranche One
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items]
Service period			1 year
Tranche Two
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items]
Service period			3 years
Tranche Three
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items]
Service period			4 years
Cash LTIP
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items]
Cash LTIP expense (net of amounts capitalized)	$ 5	$ 1,192	$ 200	$ 543
Cash LTIP grants	0	5,637	1,300	174
Cash LTIP payments	$ 42	$ 1,285	955	$ 1,183
Outstanding liability accrued			854
Cash LTIP \| Market Vesting Condition
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items]
Cash LTIP grants			$ 263