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Net Income / (Loss) Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Earnings Per Share [Abstract]
Net income / (loss)	$ 3,299	$ (254)	$ 10,821	$ 32,327
Shares used to compute basic net income / (loss) per share (in shares)	35,232	34,913	35,174	34,849
Dilutive potential common shares
Stock options (in shares)	102	0	104	113
Unvested restricted stock awards (in shares)	170	0	221	381
Shares used to compute diluted net income / (loss) per share (in shares)	35,504	34,913	35,499	35,343
Basic net income / (loss) per share (in dollars per share)	$ 0.09	$ (0.01)	$ 0.31	$ 0.93
Diluted net income / (loss) per share (in dollars per share)	$ 0.09	$ (0.01)	$ 0.30	$ 0.91
Dilutive securities included in the calculation (in shares)	1,005	0	992	1,366
Anti-dilutive securities excluded from the calculation (in shares)	1,206	2,370	1,171	1,000

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