Net Earnings (Loss) Per Common Share Computation of Basic and Diluted Net Earnings (Loss) Per Common Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands		3 Months Ended
		Mar. 31, 2020	Mar. 31, 2019
Net Earnings (Loss) per Share—Basic
Average common shares outstanding		33,784	33,304
Net Loss		$ 732	$ (13,886)
Net earnings (loss) per common share		$ 0.02	$ (0.42)
Net Earnings (Loss) per Share—Assuming Dilution
Average common shares outstanding		33,784	33,304
Stock options and awards		69	13
Average common shares assuming dilution		33,853	33,317
Net Loss		$ 732	$ (13,886)
Net earnings (loss) per per common share—assuming dilution (in dollars per share)	[1]	$ 0.02	$ (0.42)

[1] Net loss per common share assuming dilution calculated utilizing weighted average shares outstanding-basic for the periods in which there was a net loss.