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
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 income (loss)	(20,974)				(20,974)
Amounts reclassified from accumulated other comprehensive income (loss)	556				556
Contributions from noncontrolling interests	3,307						3,307
Distributions to noncontrolling interests	(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
Beginning Balance at Dec. 31, 2020	1,160,660	138	348,714	(966)	(12,076)	626,081	198,769
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	13,262					15,107	(1,845)
Other comprehensive income (loss)	9,418				9,418
Amounts reclassified from accumulated other comprehensive income (loss)	1,444				1,444
Contributions from noncontrolling interests	1,960						1,960
Stock awards, stock option exercises and other shares issued to employees and directors, net of income tax	1,615	2	7,247	(2,154)		(3,480)
Dividends declared per common share	(5,808)					(5,808)
Restricted share award dividend equivalents	0			248		(248)
Ending Balance at Mar. 31, 2021	$ 1,182,551	$ 140	$ 355,961	$ (2,872)	$ (1,214)	$ 631,652	$ 198,884