Condensed Consolidating Statement Of Cash Flows (Details) - USD ($) $ in Thousands	3 Months Ended			9 Months Ended
	Sep. 30, 2016	Mar. 31, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Condensed Consolidating Financial Statements [Line Items]
Net cash provided by operating activities		$ (21,380)		$ 88,409	$ 103,658
CASH FLOWS FROM INVESTING ACTIVITIES:
Investment in property and equipment				(17,584)	(21,810)
Proceeds from sales of assets				8,360	6,347
Acquisitions of real estate				(25,263)	(8,767)
Business acquisition, net of cash acquired				(1,341)	(13,269)
Contributions to equity method investments				(24,179)	(3,811)
Distributions from equity method investments				3,700	270
Purchases of investments, employee benefit plans				(1,430)	(2,977)
Proceeds from sales of investments, employee benefit plans				1,395	2,920
Issuance of mezzanine and other notes receivable				(20,281)	(25,253)
Collections of mezzanine and other notes receivable				11,040	3,697
Advances to and investment in affiliates				0	0
Divestment in affiliates				0	0
Other items, net				(422)	(445)
Net cash used by investing activities				(66,005)	(63,098)
CASH FLOWS FROM FINANCING ACTIVITIES:
Net borrowings pursuant to revolving credit facilities				52,814	162,032
Proceeds from issuance of long term debt				0	176
Debt issuance costs				(284)	(2,169)
Principal payments on long-term debt				(836)	(130,194)
Purchases of treasury stock				(33,958)	(56,450)
Dividends paid				(34,690)	(34,173)
Proceeds from contributions from affiliates				0	0
Distributions to affiliates				0	0
Proceeds from exercise of stock options	$ 2,600		$ 700	6,802	6,381
Net cash used by financing activities		62,627		(10,152)	(54,397)
Net change in cash and cash equivalents				12,252	(13,837)
Effect of foreign exchange rate changes on cash and cash equivalents				260	(1,781)
Cash and cash equivalents at beginning of period		193,441		193,441	214,879
Cash and cash equivalents at end of period	205,953		199,261	205,953	199,261
Parent
Condensed Consolidating Financial Statements [Line Items]
Net cash provided by operating activities				21,358	67,695
CASH FLOWS FROM INVESTING ACTIVITIES:
Investment in property and equipment				(12,579)	(16,114)
Proceeds from sales of assets				0	93
Acquisitions of real estate				0
Business acquisition, net of cash acquired				0	0
Contributions to equity method investments				0	0
Distributions from equity method investments				0	0
Purchases of investments, employee benefit plans				0	0
Proceeds from sales of investments, employee benefit plans				0	0
Issuance of mezzanine and other notes receivable				(5,306)	(7,253)
Collections of mezzanine and other notes receivable				11,040	3,697
Advances to and investment in affiliates				0	0
Divestment in affiliates				0	0
Other items, net				(382)	(445)
Net cash used by investing activities				(7,227)	(20,022)
CASH FLOWS FROM FINANCING ACTIVITIES:
Net borrowings pursuant to revolving credit facilities				53,000	162,000
Proceeds from issuance of long term debt					0
Debt issuance costs				(284)	(2,169)
Principal payments on long-term debt				0	(129,375)
Purchases of treasury stock				(33,958)	(56,450)
Dividends paid				(34,690)	(34,173)
Proceeds from contributions from affiliates				0	0
Distributions to affiliates				0	0
Proceeds from exercise of stock options				6,802	6,381
Net cash used by financing activities				(9,130)	(53,786)
Net change in cash and cash equivalents				5,001	(6,113)
Effect of foreign exchange rate changes on cash and cash equivalents				0	0
Cash and cash equivalents at beginning of period		13,529		13,529	25,290
Cash and cash equivalents at end of period	18,530		19,177	18,530	19,177
Guarantor Subsidiaries
Condensed Consolidating Financial Statements [Line Items]
Net cash provided by operating activities				43,956	10,710
CASH FLOWS FROM INVESTING ACTIVITIES:
Investment in property and equipment				(4,749)	(5,342)
Proceeds from sales of assets				0	4,661
Acquisitions of real estate				0	0
Business acquisition, net of cash acquired				0	0
Contributions to equity method investments				(24,128)	(2,771)
Distributions from equity method investments				0	0
Purchases of investments, employee benefit plans				(1,430)	(2,977)
Proceeds from sales of investments, employee benefit plans				1,395	2,920
Issuance of mezzanine and other notes receivable				0	0
Collections of mezzanine and other notes receivable				0	0
Advances to and investment in affiliates				(25,902)	(8,960)
Divestment in affiliates				11,858	2,122
Other items, net				0	0
Net cash used by investing activities				(42,956)	(10,347)
CASH FLOWS FROM FINANCING ACTIVITIES:
Net borrowings pursuant to revolving credit facilities				0	0
Proceeds from issuance of long term debt					176
Debt issuance costs				0	0
Principal payments on long-term debt				(430)	(537)
Purchases of treasury stock				0	0
Dividends paid				0	0
Proceeds from contributions from affiliates				0	0
Distributions to affiliates				0	0
Proceeds from exercise of stock options				0	0
Net cash used by financing activities				(430)	(361)
Net change in cash and cash equivalents				570	2
Effect of foreign exchange rate changes on cash and cash equivalents				0	0
Cash and cash equivalents at beginning of period		19		19	25
Cash and cash equivalents at end of period	589		27	589	27
Non-Guarantor Subsidiaries
Condensed Consolidating Financial Statements [Line Items]
Net cash provided by operating activities				23,752	25,910
CASH FLOWS FROM INVESTING ACTIVITIES:
Investment in property and equipment				(256)	(354)
Proceeds from sales of assets				8,360	1,593
Acquisitions of real estate				(25,263)	(8,767)
Business acquisition, net of cash acquired				(1,341)	(13,269)
Contributions to equity method investments				(51)	(1,040)
Distributions from equity method investments				3,700	270
Purchases of investments, employee benefit plans				0	0
Proceeds from sales of investments, employee benefit plans				0	0
Issuance of mezzanine and other notes receivable				(14,975)	(18,000)
Collections of mezzanine and other notes receivable				0	0
Advances to and investment in affiliates				0	0
Divestment in affiliates				0	0
Other items, net				(40)	0
Net cash used by investing activities				(29,866)	(39,567)
CASH FLOWS FROM FINANCING ACTIVITIES:
Net borrowings pursuant to revolving credit facilities				(186)	32
Proceeds from issuance of long term debt					0
Debt issuance costs				0	0
Principal payments on long-term debt				(406)	(282)
Purchases of treasury stock				0	0
Dividends paid				(657)	(657)
Proceeds from contributions from affiliates				25,902	8,960
Distributions to affiliates				(11,858)	(2,122)
Proceeds from exercise of stock options				0	0
Net cash used by financing activities				12,795	5,931
Net change in cash and cash equivalents				6,681	(7,726)
Effect of foreign exchange rate changes on cash and cash equivalents				260	(1,781)
Cash and cash equivalents at beginning of period		179,893		179,893	189,564
Cash and cash equivalents at end of period	186,834		180,057	186,834	180,057
Eliminations
Condensed Consolidating Financial Statements [Line Items]
Net cash provided by operating activities				(657)	(657)
CASH FLOWS FROM INVESTING ACTIVITIES:
Investment in property and equipment				0	0
Proceeds from sales of assets				0	0
Acquisitions of real estate				0	0
Business acquisition, net of cash acquired				0	0
Contributions to equity method investments				0	0
Distributions from equity method investments				0	0
Purchases of investments, employee benefit plans				0	0
Proceeds from sales of investments, employee benefit plans				0	0
Issuance of mezzanine and other notes receivable				0	0
Collections of mezzanine and other notes receivable				0	0
Advances to and investment in affiliates				25,902	8,960
Divestment in affiliates				(11,858)	(2,122)
Other items, net					0
Net cash used by investing activities				14,044	6,838
CASH FLOWS FROM FINANCING ACTIVITIES:
Net borrowings pursuant to revolving credit facilities				0	0
Proceeds from issuance of long term debt					0
Debt issuance costs				0	0
Principal payments on long-term debt				0	0
Purchases of treasury stock				0	0
Dividends paid				657	657
Proceeds from contributions from affiliates				(25,902)	(8,960)
Distributions to affiliates				11,858	2,122
Proceeds from exercise of stock options				0	0
Net cash used by financing activities				(13,387)	(6,181)
Net change in cash and cash equivalents				0	0
Effect of foreign exchange rate changes on cash and cash equivalents				0	0
Cash and cash equivalents at beginning of period		$ 0		0	0
Cash and cash equivalents at end of period	$ 0		$ 0	$ 0	$ 0