Condensed Consolidated Statements of Equity - USD ($) $ in Thousands	Total	Common Shares	Additional Paid-in Capital	Treasury Shares	Accumulated Other Comprehensive Income (Loss)	Retained Earnings	Noncontrolling Interests	Adoption of accounting standard, adjustment	Adoption of accounting standard, adjustment Retained Earnings
Beginning Balance at Dec. 31, 2018	$ 876,764	$ 96	$ 224,396	$ (35,300)	$ (6,387)	$ 647,517	$ 46,442	$ (711)	$ (711)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	15,263					15,895	(632)
Other comprehensive loss	(11,314)				(11,314)
Amounts reclassified from accumulated other comprehensive loss	11,460				11,460
Contributions from noncontrolling interests	4,715						4,715
Stock awards, stock option exercises and other shares issued to employees and directors, net of income tax	7,680		(21,018)	28,698
Dividends declared per common share	(11,059)					(11,059)
Stock awards granted due to acquisition	127,841	41	127,800
Restricted share award dividend equivalents	0		8	153		(161)
Ending Balance at Jun. 30, 2019	1,020,639	137	331,186	(6,449)	(6,241)	651,481	50,525
Beginning Balance at Mar. 31, 2019	998,286	137	324,753	(7,216)	2,474	627,136	51,002
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	29,411					29,888	(477)
Other comprehensive loss	(8,544)				(8,544)
Amounts reclassified from accumulated other comprehensive loss	(171)				(171)
Stock awards, stock option exercises and other shares issued to employees and directors, net of income tax	2,492		1,738	754
Dividends declared per common share	(5,530)					(5,530)
Stock award purchase price accounting adjustment	4,695		4,695
Restricted share award dividend equivalents	0			13		(13)
Ending Balance at Jun. 30, 2019	1,020,639	137	331,186	(6,449)	(6,241)	651,481	50,525
Beginning Balance at Dec. 31, 2019	1,195,655	137	345,359	(7,342)	(7,231)	642,687	222,045
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	(31,078)					(7,222)	(23,856)
Other comprehensive loss	(21,208)				(21,208)
Amounts reclassified from accumulated other comprehensive loss	2,194				2,194
Contributions from noncontrolling interests	4,409						4,409
Distributions to noncontrolling interests	(10,298)						(10,298)
Noncontrolling interests recognized in connection with business combination	(64)		(459)				395
Stock awards, stock option exercises and other shares issued to employees and directors, net of income tax	3,986	1	(1,170)	5,998		(843)
Dividends declared per common share	(11,513)					(11,513)
Restricted share award dividend equivalents	0			391		(391)
Ending Balance at Jun. 30, 2020	1,132,083	138	343,730	(953)	(26,245)	622,718	192,695
Beginning Balance at Mar. 31, 2020	1,113,862	137	341,382	(652)	(27,649)	599,039	201,605
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	20,032					30,439	(10,407)
Other comprehensive loss	(234)				(234)
Amounts reclassified from accumulated other comprehensive loss	1,638				1,638
Contributions from noncontrolling interests	1,102						1,102
Noncontrolling interests recognized in connection with business combination	(64)		(459)				395
Stock awards, stock option exercises and other shares issued to employees and directors, net of income tax	1,511	1	2,807	(454)		(843)
Dividends declared per common share	(5,764)					(5,764)
Restricted share award dividend equivalents	0			153		(153)
Ending Balance at Jun. 30, 2020	$ 1,132,083	$ 138	$ 343,730	$ (953)	$ (26,245)	$ 622,718	$ 192,695