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Earnings per share - Computation of Basic and Diluted Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Earnings Per Share [Abstract]
Net income	$ 20,988	$ 51,845	$ 72,685	$ 127,564
Basic weighted-average shares outstanding	71,699	71,588	71,693	71,588
Effect of dilutive share-based compensation awards	68		70
Diluted weighted-average shares outstanding	71,767	71,588	71,763	71,588
Earnings per share, basic	$ 0.29	$ 0.72	$ 1.01	$ 1.78
Earnings per share, diluted	$ 0.29	$ 0.72	$ 1.01	$ 1.78

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The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

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