Earnings (Loss) Per Share (Details) - USD ($)	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2018
Earnings Per Share [Abstract]
Incremental common shares attributable to dilutive effect of share-based payment arrangements (in shares)	776,000	835,000	872,000	929,000
Antidilutive securities excluded from computation of earnings per share, amount (in shares)	1,000	445,000	1,000	2,000
Number of repurchased shares (in shares)			365,695
Cost of repurchased stock			$ 16,000,000		$ 0