Stock Compensation - Basic and Diluted Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Share-based Payment Arrangement [Abstract]
Net Income (Loss) Attributable to Parent	$ 13,521	$ 14,354	$ 13,150	$ 13,910	$ 14,852	$ 15,534	$ 9,626	$ 6,583	$ 54,935	$ 46,595	$ 66,390
Basic weighted average shares outstanding (in shares)									49,811	49,542	49,150
Basic net income per share (in dollars per share)	$ 0.27	$ 0.29	$ 0.26	$ 0.28	$ 0.31	$ 0.31	$ 0.19	$ 0.13	$ 1.10	$ 0.94	$ 1.35
Effect from dilutive shares and options outstanding (in shares)									290	521	876
Weighted average shares outstanding, diluted (in shares)									50,101	50,063	50,026
Diluted net income per share (in dollars per share)	$ 0.27	$ 0.29	$ 0.26	$ 0.28	$ 0.30	$ 0.31	$ 0.19	$ 0.13	$ 1.10	$ 0.93	$ 1.33