Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Earnings Per Share [Abstract]
Net income (loss)	$ (1,719)	$ 2,724	$ (5,754)	$ (5,666)
Weighted-average common shares outstanding — basic	60,711	60,473	60,609	60,369
Effect of stock options and restricted stock units		451
Weighted-average common shares outstanding — diluted	60,711	60,924	60,609	60,369
Earnings (loss) per share — basic	$ (0.03)	$ 0.05	$ (0.10)	$ (0.09)
Earnings (loss) per share — diluted	$ (0.03)	$ 0.05	$ (0.10)	$ (0.09)