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
Net loss
Income (loss) from continuing operations	$ (6,912)	$ (6,690)	$ (13,859)	$ (7,094)
Income from discontinued operations, net of income taxes	2,649	2,518	3,993	4,536
Net income (loss)	$ (4,263)	$ (4,172)	$ (9,866)	$ (2,558)
Weighted-average common shares outstanding used in earnings per share computations (in shares)	61,460	61,843	61,395	61,858
Continuing operations (in dollars per share)	$ (0.11)	$ (0.11)	$ (0.23)	$ (0.11)
Discontinued operations (in dollars per share)	0.04	0.04	0.07	0.07
Basic earnings per common share (in dollars per share)	$ (0.07)	$ (0.07)	$ (0.16)	$ (0.04)
Diluted Earnings (Loss) per Common Share
Net income (loss)	$ (4,263)	$ (4,172)	$ (9,866)	$ (2,558)
Shares used in diluted earnings per share computations (in shares)	61,460	61,843	61,395	61,858
Continuing operations (in dollars per share)	$ (0.11)	$ (0.11)	$ (0.23)	$ (0.11)
Discontinued operations (in dollars per share)	0.04	0.04	0.07	0.07
Diluted earnings per common share (in dollars per share)	$ (0.07)	$ (0.07)	$ (0.16)	$ (0.04)
Computation of Shares Used in Earnings (Loss) Per Common Share
Weighted-average common shares outstanding (in shares)	61,460	61,843	61,395	61,858
Weighted-average common equivalent shares - dilutive effect of stock options and awards (in shares)	0	0
Shares used in diluted earnings per share computations (in shares)	61,460	61,843	61,395	61,858