Earnings (Loss) Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Basic earnings (loss) per share:
Net income (loss)	$ (2,336)	$ 1,398	$ (3,599)	$ 1,750
Weighted-average common shares	39,183	38,102	38,994	37,952
Basic earnings (loss) per share	$ (0.06)	$ 0.04	$ (0.09)	$ 0.05
Diluted earnings (loss) per share:
Net income (loss)	$ (2,336)	$ 1,398	$ (3,599)	$ 1,750
Weighted-average common shares	39,183	38,102	38,994	37,952
Incremental Common Shares Attributable To Stock Options And Restricted Stock Units		3,432		3,632
Incremental Common Shares Attributable To Contingently Issuable Shares		88		83
Weighted-average common shares and equivalents	39,183	41,622	38,994	41,667
Diluted earnings (loss) per share	$ (0.06)	$ 0.03	$ (0.09)	$ 0.04