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)	9,393					11,658	(2,265)
Other comprehensive income (loss)	(12,719)				(12,719)
Amounts reclassified from accumulated other comprehensive income (loss)	11,486				11,486
Contributions from noncontrolling interests	4,879		164				4,715
Stock awards, stock option exercises and other shares issued to employees and directors, net of income tax	11,023		(16,452)	27,475
Dividends declared per common share	(16,606)					(16,606)
Stock awards granted due to acquisition	127,841	41	127,800
Restricted share award dividend equivalents	0		8	243		(251)
Ending Balance at Sep. 30, 2019	1,011,350	137	335,916	(7,582)	(7,620)	641,607	48,892
Beginning Balance at Jun. 30, 2019	1,020,639	137	331,186	(6,449)	(6,241)	651,481	50,525
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	(5,870)					(4,237)	(1,633)
Other comprehensive income (loss)	(1,405)				(1,405)
Amounts reclassified from accumulated other comprehensive income (loss)	26				26
Contributions from noncontrolling interests	164		164
Stock awards, stock option exercises and other shares issued to employees and directors, net of income tax	3,343		4,566	(1,223)
Dividends declared per common share	(5,547)					(5,547)
Restricted share award dividend equivalents	0			90		(90)
Ending Balance at Sep. 30, 2019	1,011,350	137	335,916	(7,582)	(7,620)	641,607	48,892
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)	(28,864)					(8,281)	(20,583)
Other comprehensive income (loss)	(19,340)				(19,340)
Amounts reclassified from accumulated other comprehensive income (loss)	4,341				4,341
Contributions from noncontrolling interests	6,493						6,493
Distributions to noncontrolling interests	(10,322)						(10,322)
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	6,610	1	1,380	6,072		(843)
Dividends declared per common share	(17,282)					(17,282)
Restricted share award dividend equivalents	0			391		(391)
Ending Balance at Sep. 30, 2020	1,137,227	138	346,280	(879)	(22,230)	615,890	198,028
Beginning Balance at Jun. 30, 2020	1,132,083	138	343,730	(953)	(26,245)	622,718	192,695
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	2,215					(1,058)	3,273
Other comprehensive income (loss)	1,868				1,868
Amounts reclassified from accumulated other comprehensive income (loss)	2,147				2,147
Contributions from noncontrolling interests	2,083						2,083
Distributions to noncontrolling interests	(23)						(23)
Stock awards, stock option exercises and other shares issued to employees and directors, net of income tax	2,624		2,550	74
Dividends declared per common share	(5,770)					(5,770)
Ending Balance at Sep. 30, 2020	$ 1,137,227	$ 138	$ 346,280	$ (879)	$ (22,230)	$ 615,890	$ 198,028