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Earnings / (Loss) Per Share - Components of Basic and Diluted EPS (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended						9 Months Ended
	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Sep. 30, 2019	Sep. 30, 2018
Earnings Per Share [Abstract]
Net income / (loss)	$ 17,690	$ 13,796	$ 9,010	$ (7,652)	$ 10,733	$ 10,515	$ 40,496	$ 13,596
Less: income allocated to participating securities	0			0			0	(2)
Net income / (loss) attributable to common stockholders	$ 17,690			$ (7,652)			$ 40,496	$ 13,594
Weighted average common shares outstanding - basic (in shares)	48,518,041			47,812,642			48,360,927	47,494,926
Dilutive effect of stock options, restricted stock units and restricted stock awards (in shares)	1,634,766			0			1,877,482	2,098,992
Weighted average common shares outstanding - diluted (in shares)	50,152,807			47,812,642			50,238,409	49,593,918
Weighted average common shares outstanding — diluted (C)
Basic (in dollars per share)	$ 0.36			$ (0.16)			$ 0.84	$ 0.29
Diluted (in dollars per share)	$ 0.35			$ (0.16)			$ 0.81	$ 0.27

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