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	23,752					23,653	23,653	99
Other Comprehensive Income (Loss), Net of Tax	(7,015)			(7,015)			(7,015)	0
Treasury Stock, Value, Acquired, Cost Method	(3,817)				(3,817)		(3,817)	0
Sharebased Compensation Effect On Stockholders Equity	1,044		741		303		1,044	0
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest, Ending Balance at Sep. 30, 2018	445,400	18,625	125,279	(11,963)	(66,918)	377,848	442,871	2,529
Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders	(172)						0	(172)
Dividends, Common Stock, Cash	(2,222)					(2,222)	(2,222)	0
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest, Beginning Balance at Jun. 30, 2018	436,496	18,625	125,018	(11,237)	(66,440)	367,913	433,879	2,617
Net Income (Loss), Including Portion Attributable to Nonredeemable Noncontrolling Interest	9,994					9,935	9,935	59
Other Comprehensive Income (Loss), Net of Tax	(726)			(726)			(726)	0
Treasury Stock, Value, Acquired, Cost Method	(670)				(670)		(670)	0
Sharebased Compensation Effect On Stockholders Equity	453		261		192		453	0
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest, Ending Balance at Sep. 30, 2018	445,400	18,625	125,279	(11,963)	(66,918)	377,848	442,871	2,529
Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders	(147)						0	(147)
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	21,846					21,716	21,716	130
Other Comprehensive Income (Loss), Net of Tax	11,897			11,897			11,897	0
Treasury Stock, Value, Acquired, Cost Method	(3,917)				(3,917)		(3,917)	0
Sharebased Compensation Effect On Stockholders Equity	(557)		(1,162)		605		(557)	0
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest, Ending Balance at Sep. 30, 2019	473,918	18,625	122,221	3,587	(69,704)	399,160	473,889	29
Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders	(403)						0	(403)
Noncontrolling Interest, Decrease from Redemptions or Purchase of Interests	(3,392)		(1,012)				(1,012)	(2,380)
Dividends, Common Stock, Cash	(2,987)					(2,987)	(2,987)	0
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest, Beginning Balance at Jun. 30, 2019	468,142	18,625	121,586	2,298	(67,428)	393,018	468,099	43
Net Income (Loss), Including Portion Attributable to Nonredeemable Noncontrolling Interest	6,128					6,142	6,142	(14)
Other Comprehensive Income (Loss), Net of Tax	1,289			1,289			1,289	0
Treasury Stock, Value, Acquired, Cost Method	(2,318)				(2,318)		(2,318)	0
Sharebased Compensation Effect On Stockholders Equity	677		635		42		677	0
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest, Ending Balance at Sep. 30, 2019	$ 473,918	$ 18,625	$ 122,221	$ 3,587	$ (69,704)	$ 399,160	$ 473,889	$ 29