Earnings (Loss) Per Share (Details) - USD ($)	3 Months Ended		12 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2018
Earnings Per Share [Abstract]
Incremental common shares attributable to Dilutive effect of share-based payment arrangements (in shares)	971,000	1,009,000
Antidilutive securities excluded from computation of earnings per share, amount (in shares)	0	9,000
Number of repurchased shares (in shares)	317,508
Cost of repurchased stock	$ 14,000,000		$ 0