Significant Accounting Policies - Schedule of Earnings Per Share (Details) - shares shares in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Accounting Policies [Abstract]
Weighted average common shares outstanding—basic (in shares)	37,119	37,528	37,349	37,527
Dilutive effect of common stock options and awards (in shares)	0	0	0	0
Weighted average common shares outstanding—diluted (in shares)	37,119	37,528	37,349	37,527