Consolidated Statements of Equity - USD ($) $ in Thousands		Total		Common Shares	Additional Paid-in Capital	Treasury Shares	Accumulated Other Comprehensive Loss	Retained Earnings	Noncontrolling Interests
Beginning Balance at Dec. 31, 2016		$ 790,697		$ 96	$ 222,910	$ (45,383)	$ (12,468)	$ 609,206	$ 16,336
Increase (Decrease) in Stockholders' Equity
Net income		42,609						42,511	98
Other comprehensive income		9,768	[1]				9,768
Cash received from (paid to) noncontrolling interest, net		377							377
Other changes to noncontrolling interest		(8,360)							(8,360)
Stock awards, stock option exercises and other shares issued to employees and directors, net of income tax of ($267 (127 shares), $323 (138 shares) and $458 (196 shares) in 2018, 2017 and 2016, respectively		6,714			1,707	5,007
Dividends declared ($0.665, $0.645 and $0.625 per share in 2018, 2017 and 2016, respectively)		(18,152)						(18,152)
Stock award dividend equivalents		0			5	64		(69)
Ending Balance at Dec. 31, 2017		822,899		96	224,622	(40,312)	(2,700)	633,496	7,697
Increase (Decrease) in Stockholders' Equity
Net income		41,225						41,484	(259)
Other comprehensive income		(3,687)	[1]				(3,687)
Cash received from (paid to) noncontrolling interest, net		36,736			(2,268)				39,004
Cumulative adjustment for adoption of leasing standard, net		(7,818)						(7,818)
Stock awards, stock option exercises and other shares issued to employees and directors, net of income tax of ($267 (127 shares), $323 (138 shares) and $458 (196 shares) in 2018, 2017 and 2016, respectively		6,913			2,042	4,871
Dividends declared ($0.665, $0.645 and $0.625 per share in 2018, 2017 and 2016, respectively)		(19,504)						(19,504)
Stock award dividend equivalents		0				141		(141)
Ending Balance at Dec. 31, 2018		876,764		96	224,396	(35,300)	(6,387)	647,517	46,442
Increase (Decrease) in Stockholders' Equity
Net income		15,060						18,307	(3,247)
Other comprehensive income	[1]	(844)
Cash received from (paid to) noncontrolling interest, net		4,879			164				4,715
Acquisition of noncontrolling interest		179,247			5,112				174,135
Other Comprehensive Income (Loss), Business Combination, Step Acquisition, Equity Interest in Acquiree, Remeasurement Gain (Loss), Net		11,890					11,890
Other Comprehensive Income (Loss), Excluding Business Combination, Step Acquisition, Equity Interest in Acquiree, Remeasurement Gain (Loss), Net		(12,734)					(12,734)
Cumulative adjustment for adoption of leasing standard, net		(550)						(550)
Stock awards, stock option exercises and other shares issued to employees and directors, net of income tax of ($267 (127 shares), $323 (138 shares) and $458 (196 shares) in 2018, 2017 and 2016, respectively		15,587			(12,121)	27,708
Dividends declared ($0.665, $0.645 and $0.625 per share in 2018, 2017 and 2016, respectively)		(22,329)						(22,329)
Shares issued for acquisition		127,841		41	127,800
Stock award dividend equivalents		0			8	250		(258)
Ending Balance at Dec. 31, 2019		$ 1,195,655		$ 137	$ 345,359	$ (7,342)	$ (7,231)	$ 642,687	$ 222,045

[1] All amounts are net of tax. Amounts in parentheses indicate debit