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)	(31,078)					(7,222)	(23,856)
Other comprehensive loss	(21,208)				(21,208)
Amounts reclassified from accumulated other comprehensive income	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
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Common Stock, Dividends, Per Share, Declared	$ 0.350
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 income	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
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Common Stock, Dividends, Per Share, Declared	$ 0.175
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)	59,386					58,606	780
Other comprehensive loss	7,311				7,311
Amounts reclassified from accumulated other comprehensive income	2,928				2,928
Contributions from noncontrolling interests	2,940						2,940
Distributions to noncontrolling interests	(25)						(25)
Stock awards, stock option exercises and other shares issued to employees and directors, net of income tax	3,398	2	8,892	(2,016)		(3,480)
Dividends declared per common share	(11,634)					(11,634)
Restricted share award dividend equivalents	0			332		(332)
Ending Balance at Jun. 30, 2021	$ 1,224,964	140	357,606	(2,650)	(1,837)	669,241	202,464
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Common Stock, Dividends, Per Share, Declared	$ 0.350
Beginning Balance at Mar. 31, 2021	$ 1,182,551	140	355,961	(2,872)	(1,214)	631,652	198,884
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	46,124					43,499	2,625
Other comprehensive loss	(2,108)				(2,108)
Amounts reclassified from accumulated other comprehensive income	1,485				1,485
Contributions from noncontrolling interests	980						980
Distributions to noncontrolling interests	(25)						(25)
Stock awards, stock option exercises and other shares issued to employees and directors, net of income tax	1,783		1,645	138
Dividends declared per common share	(5,826)					(5,826)
Restricted share award dividend equivalents	0			84		(84)
Ending Balance at Jun. 30, 2021	$ 1,224,964	$ 140	$ 357,606	$ (2,650)	$ (1,837)	$ 669,241	$ 202,464
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Common Stock, Dividends, Per Share, Declared	$ 0.175