Condensed Consolidated Statement of Stockholders' Equity - USD ($) $ in Thousands	Total	Common Stock	Additional Paid-in Capital	AOCI Attributable to Parent	Treasury Stock	Retained Earnings	Parent	Noncontrolling Interest
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest, Beginning Balance at Dec. 31, 2017	$ 434,243	$ 18,625	$ 124,538	$ (4,598)	$ (63,404)	$ 356,383	$ 431,544	$ 2,699
Net Income (Loss), Including Portion Attributable to Nonredeemable Noncontrolling Interest	6,977					6,961	6,961	16
Other Comprehensive Income (Loss), Net of Tax	(4,037)			(4,037)			(4,037)	0
Treasury Stock, Value, Acquired, Cost Method	(2,642)				(2,642)		(2,642)	0
Sharebased Compensation Effect On Stockholders Equity	286		236		50		286	0
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest, Ending Balance at Mar. 31, 2018	434,414	18,625	124,774	(8,985)	(65,996)	363,378	431,796	2,618
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest, Beginning Balance at Dec. 31, 2018	451,431	18,625	124,395	(8,310)	(66,392)	380,431	448,749	2,682
Net Income (Loss), Including Portion Attributable to Nonredeemable Noncontrolling Interest	8,844					8,727	8,727	117
Other Comprehensive Income (Loss), Net of Tax	5,669			5,669			5,669	0
Treasury Stock, Value, Acquired, Cost Method	(91)				(91)		(91)	0
Dividends, Common Stock, Cash	(2,994)					(2,994)	(2,994)	0
Sharebased Compensation Effect On Stockholders Equity	(1,783)		(2,340)		557		(1,783)	0
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest, Ending Balance at Mar. 31, 2019	461,076	$ 18,625	$ 122,055	(2,641)	$ (65,926)	386,164	458,277	2,799
Cumulative Effect of New Accounting Principle in Period of Adoption	$ (413)			$ (350)		$ 34	$ (316)	$ (97)