Earnings Per Share - (Computations for Basic and Diluted Earnings (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]
Income (loss) from continuing operations	$ 11,497	$ 1,181	$ 32,045	$ (5,826)
Loss from discontinued operations, net of income taxes	(3,251)	(2,155)	(6,631)	(4,469)
Net income (loss)	$ 8,246	$ (974)	$ 25,414	$ (10,295)
Weighted-average common shares outstanding — basic	63,605	62,267	63,243	62,041
Effect of stock options and restricted stock units	1,385		1,411
Weighted-average common shares outstanding — diluted	64,990	62,267	64,654	62,041
Earnings (loss) per share from continuing operations — basic	$ 0.18	$ 0.02	$ 0.51	$ (0.09)
Earnings (loss) per share from continuing operations — diluted	$ 0.18	$ 0.02	$ 0.50	$ (0.09)