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, net of income tax of ($237)	Adoption of accounting standard, net of income tax of ($237) 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)	(14,148)					(13,993)	(155)
Other comprehensive loss	(2,770)				(2,770)
Amounts reclassified from accumulated other comprehensive loss	11,631				(11,631)
Contributions received from noncontrolling interest	4,715						4,715
Stock awards, stock option exercises and other shares issued to employees and directors, net of income tax	5,188		(22,756)	27,944
Dividends declared per common share	(5,529)					(5,529)
Stock awards granted due to acquisition	123,146	41	123,105
Restricted share award dividend equivalents	0		8	140		(148)
Ending Balance at Mar. 31, 2019	998,286	137	324,753	(7,216)	2,474	627,136	51,002
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)	(51,111)					(37,662)	(13,449)
Other comprehensive loss	(20,974)				(20,974)
Amounts reclassified from accumulated other comprehensive loss	556				556
Contributions received from noncontrolling interest	3,307						3,307
Distributions to noncontrolling interest	(10,298)						(10,298)
Stock awards, stock option exercises and other shares issued to employees and directors, net of income tax	2,475		(3,977)	6,452
Dividends declared per common share	(5,748)					(5,748)
Restricted share award dividend equivalents	0			238		(238)
Ending Balance at Mar. 31, 2020	$ 1,113,862	$ 137	$ 341,382	$ (652)	$ (27,649)	$ 599,039	$ 201,605