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Earnings (loss) per share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Earnings Per Share [Abstract]
Net income (loss)	$ 7,131	$ (9,515)	$ (8,008)	$ (25,678)
Amount allocated to common stockholders (in hundredths)	92.03%	100.00%	100.00%	100.00%
Basic EPS:
Net income (loss) allocated to common stockholders	$ 6,563	$ (9,515)	$ (8,008)	$ (25,678)
Net income (loss) allocated to common stockholders (shares)	87,272,000	87,060,000	87,263,000	87,050,000
Net income (loss) allocated to common stockholders, per share (in USD per share)	$ 0.08	$ (0.11)	$ (0.09)	$ (0.29)
Effect of Dilutive Securities:
Share-based compensation	$ 0	$ 0
Share-based compensation (shares)	785,000	0
Diluted EPS:
Net income (loss) allocated to common stockholders with assumed conversion	$ 6,563	$ (9,515)	$ (8,008)	$ (25,678)
Net income (loss) allocated to common stockholders with assumed conversion (shares)	88,057,000	87,060,000	87,263,000	87,050,000
Net income (loss) allocated to common stockholders with assumed conversion, per share (in USD per share)	$ 0.07	$ (0.11)	$ (0.09)	$ (0.29)
Securities excluded from calculation of diluted EPS (shares)	432,506	1,800,096	462,506	1,288,473

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Additional shares included in the calculation of diluted EPS as a result of the potentially dilutive effect of share based payment arrangements using the treasury stock method.

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