Condensed Consolidated Statements 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	13,758					13,718	13,718	40
Other Comprehensive Income (Loss), Net of Tax	(6,289)			(6,289)			(6,289)	0
Treasury Stock, Value, Acquired, Cost Method	(3,147)				(3,147)		(3,147)	0
Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders	(25)						0	(25)
Common stock dividend	(2,222)					(2,222)	(2,222)	0
Sharebased Compensation Effect On Stockholders Equity	591		480		111		591	0
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest, Ending Balance at Jun. 30, 2018	436,496	18,625	125,018	(11,237)	(66,440)	367,913	433,879	2,617
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest, Beginning Balance at Mar. 31, 2018	434,414	18,625	124,774	(8,985)	(65,996)	363,378	431,796	2,618
Net Income (Loss), Including Portion Attributable to Nonredeemable Noncontrolling Interest	6,781					6,757	6,757	24
Other Comprehensive Income (Loss), Net of Tax	(2,252)			(2,252)			(2,252)	0
Treasury Stock, Value, Acquired, Cost Method	(505)				(505)		(505)	0
Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders	(25)						0	(25)
Common stock dividend	(2,222)					(2,222)	(2,222)	0
Sharebased Compensation Effect On Stockholders Equity	305		244		61		305	0
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest, Ending Balance at Jun. 30, 2018	436,496	18,625	125,018	(11,237)	(66,440)	367,913	433,879	2,617
Cumulative Effect of New Accounting Principle in Period of Adoption	(413)			(350)		34	(316)	(97)
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	15,718					15,574	15,574	144
Other Comprehensive Income (Loss), Net of Tax	10,608			10,608			10,608	0
Treasury Stock, Value, Acquired, Cost Method	(1,599)				(1,599)		(1,599)	0
Noncontrolling Interest, Decrease from Redemptions or Purchase of Interests	(3,392)		(1,012)				(1,012)	(2,380)
Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders	(403)						0	(403)
Common stock dividend	(2,987)					(2,987)	(2,987)	0
Sharebased Compensation Effect On Stockholders Equity	(1,234)		(1,797)		563		(1,234)	0
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest, Ending Balance at Jun. 30, 2019	468,142	18,625	121,586	2,298	(67,428)	393,018	468,099	43
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest, Beginning Balance at Mar. 31, 2019	461,076	18,625	122,055	(2,641)	(65,926)	386,164	458,277	2,799
Net Income (Loss), Including Portion Attributable to Nonredeemable Noncontrolling Interest	6,874					6,847	6,847	27
Other Comprehensive Income (Loss), Net of Tax	4,939			4,939			4,939	0
Treasury Stock, Value, Acquired, Cost Method	(1,508)				(1,508)		(1,508)	0
Noncontrolling Interest, Decrease from Redemptions or Purchase of Interests	(3,392)		(1,012)				(1,012)	(2,380)
Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders	(403)						0	(403)
Common stock dividend	7					7	7	0
Sharebased Compensation Effect On Stockholders Equity	549		543		6		549	0
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest, Ending Balance at Jun. 30, 2019	$ 468,142	$ 18,625	$ 121,586	$ 2,298	$ (67,428)	$ 393,018	$ 468,099	$ 43