Condensed Consolidating Financial Statements Consolidating Statement Of Cash Flows (Details) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Net cash provided by (used in) by operating activities	$ 153,913,000	$ 150,122,000	$ 131,369,000
CASH FLOWS FROM INVESTING ACTIVITIES
Investment in property and equipment	(33,397,000)	(15,443,000)	(10,924,000)
Equity method investments	(5,685,000)	(20,285,000)	(5,000,000)
Issuance of mezzanine and other notes receivable	(1,095,000)	(23,736,000)	(9,227,000)
Collections of mezzanine and other notes receivable	9,748,000	3,270,000	4,690,000
Proceeds from sale of assets	243,000	0	1,654,000
Purchases of investments, employee benefit plans	(2,676,000)	(1,697,000)	(1,602,000)
Proceeds from sales of investments, employee benefit plans	4,168,000	11,223,000	644,000
Other items, net	(728,000)	(433,000)	(564,000)
Net cash used in investing activities	(29,422,000)	(47,101,000)	(20,329,000)
CASH FLOWS FROM FINANCING ACTIVITIES
Net borrowings (repayments) pursuant to revolving credit facilities	(57,000,000)	57,000,000	(200,000)
Principal payments on long-term debt	(8,204,000)	(4,422,000)	(297,000)
Proceeds from the issuance of long-term debt	3,360,000	543,500,000	75,000
Purchase of treasury stock	(3,965,000)	(22,586,000)	(53,617,000)
Excess tax benefits from stock-based compensation	1,460,000	1,559,000	1,227,000
Debt issuance costs	0	(4,759,000)	(2,356,000)
Proceeds from exercise of stock options	8,864,000	7,090,000	3,845,000
Dividends paid	(32,799,000)	(654,092,000)	(43,747,000)
Net cash used in financing activities	(88,284,000)	(76,710,000)	(95,070,000)
Net change in cash and cash equivalents	36,207,000	26,311,000	15,970,000
Effect of foreign exchange rate changes on cash and cash equivalents	(2,589,000)	809,000	(172,000)
Cash and cash equivalents at beginning of period	134,177,000	107,057,000	91,259,000
Cash and cash equivalents at end of period	167,795,000	134,177,000	107,057,000
Parent [Member]
Net cash provided by (used in) by operating activities	91,745,000	90,688,000	120,850,000
CASH FLOWS FROM INVESTING ACTIVITIES
Investment in property and equipment	(5,167,000)	(7,404,000)	(2,839,000)
Equity method investments	0	0	0
Issuance of mezzanine and other notes receivable	(1,095,000)	(23,736,000)	(9,227,000)
Collections of mezzanine and other notes receivable	9,748,000	3,270,000	4,690,000
Proceeds from sale of assets			1,654,000
Purchases of investments, employee benefit plans	0	0	0
Proceeds from sales of investments, employee benefit plans	0	0	0
Advances to and investments in affiliates	(1,000,000)	0
Other items, net	(485,000)	(433,000)	(570,000)
Net cash used in investing activities	2,001,000	(28,303,000)	(6,292,000)
CASH FLOWS FROM FINANCING ACTIVITIES
Net borrowings (repayments) pursuant to revolving credit facilities	(57,000,000)	57,000,000	(200,000)
Principal payments on long-term debt	(7,500,000)	(3,750,000)	0
Proceeds from the issuance of long-term debt	0	543,500,000	0
Purchase of treasury stock	(3,965,000)	(22,586,000)	(53,617,000)
Excess tax benefits from stock-based compensation	19,000	262,000	38,000
Debt issuance costs		(4,759,000)	(2,356,000)
Proceeds from exercise of stock options	8,864,000	7,090,000	3,845,000
Proceeds from contributions from affiliates	0	0
Dividends paid	(32,799,000)	(654,092,000)	(43,747,000)
Net cash used in financing activities	(92,381,000)	(77,335,000)	(96,037,000)
Net change in cash and cash equivalents	1,365,000	(14,950,000)	18,521,000
Effect of foreign exchange rate changes on cash and cash equivalents	0	0	0
Cash and cash equivalents at beginning of period	8,420,000	23,370,000	4,849,000
Cash and cash equivalents at end of period	9,785,000	8,420,000	23,370,000
Guarantor Subsidiaries [Member]
Net cash provided by (used in) by operating activities	27,209,000	18,191,000	(10,483,000)
CASH FLOWS FROM INVESTING ACTIVITIES
Investment in property and equipment	(27,984,000)	(7,800,000)	(7,690,000)
Equity method investments	(2,401,000)	0	0
Issuance of mezzanine and other notes receivable	0	0	0
Collections of mezzanine and other notes receivable	0	0	0
Proceeds from sale of assets			0
Purchases of investments, employee benefit plans	(2,676,000)	(1,697,000)	(1,602,000)
Proceeds from sales of investments, employee benefit plans	4,168,000	11,223,000	644,000
Advances to and investments in affiliates	(2,284,000)	(20,586,000)
Other items, net	0	0	(10,000)
Net cash used in investing activities	(31,177,000)	(18,860,000)	(8,658,000)
CASH FLOWS FROM FINANCING ACTIVITIES
Net borrowings (repayments) pursuant to revolving credit facilities	0	0	0
Principal payments on long-term debt	(671,000)	(653,000)	(275,000)
Proceeds from the issuance of long-term debt	3,360,000	0	0
Purchase of treasury stock	0	0	0
Excess tax benefits from stock-based compensation	1,441,000	1,297,000	1,189,000
Debt issuance costs		0	0
Proceeds from exercise of stock options	0	0	0
Proceeds from contributions from affiliates	0	0
Dividends paid	0	0	0
Net cash used in financing activities	4,130,000	644,000	914,000
Net change in cash and cash equivalents	162,000	(25,000)	(18,227,000)
Effect of foreign exchange rate changes on cash and cash equivalents	0	0	0
Cash and cash equivalents at beginning of period	407,000	432,000	18,659,000
Cash and cash equivalents at end of period	569,000	407,000	432,000
Non-Guarantor Subsidiaries [Member]
Net cash provided by (used in) by operating activities	36,529,000	41,243,000	21,002,000
CASH FLOWS FROM INVESTING ACTIVITIES
Investment in property and equipment	(246,000)	(239,000)	(395,000)
Equity method investments	(3,284,000)	(20,285,000)	(5,000,000)
Issuance of mezzanine and other notes receivable	0	0	0
Collections of mezzanine and other notes receivable	0	0	0
Proceeds from sale of assets			0
Purchases of investments, employee benefit plans	0	0	0
Proceeds from sales of investments, employee benefit plans	0	0	0
Advances to and investments in affiliates	0	0
Other items, net	0	0	16,000
Net cash used in investing activities	(3,530,000)	(20,524,000)	(5,379,000)
CASH FLOWS FROM FINANCING ACTIVITIES
Net borrowings (repayments) pursuant to revolving credit facilities	0	0	0
Principal payments on long-term debt	(33,000)	(19,000)	(22,000)
Proceeds from the issuance of long-term debt	0	0	75,000
Purchase of treasury stock	0	0	0
Excess tax benefits from stock-based compensation	0	0	0
Debt issuance costs		0	0
Proceeds from exercise of stock options	0	0	0
Proceeds from contributions from affiliates	3,284,000	20,586,000
Dividends paid	(1,570,000)	0	0
Net cash used in financing activities	1,681,000	20,567,000	53,000
Net change in cash and cash equivalents	34,680,000	41,286,000	15,676,000
Effect of foreign exchange rate changes on cash and cash equivalents	(2,589,000)	809,000	(172,000)
Cash and cash equivalents at beginning of period	125,350,000	83,255,000	67,751,000
Cash and cash equivalents at end of period	157,441,000	125,350,000	83,255,000
Eliminations [Member]
Net cash provided by (used in) by operating activities	(1,570,000)	0	0
CASH FLOWS FROM INVESTING ACTIVITIES
Investment in property and equipment	0	0	0
Equity method investments	0	0	0
Issuance of mezzanine and other notes receivable	0	0	0
Collections of mezzanine and other notes receivable	0	0	0
Proceeds from sale of assets			0
Purchases of investments, employee benefit plans	0	0	0
Proceeds from sales of investments, employee benefit plans	0	0	0
Advances to and investments in affiliates	3,284,000	20,586,000
Other items, net	0	0	0
Net cash used in investing activities	3,284,000	20,586,000	0
CASH FLOWS FROM FINANCING ACTIVITIES
Net borrowings (repayments) pursuant to revolving credit facilities	0	0	0
Principal payments on long-term debt	0	0	0
Proceeds from the issuance of long-term debt	0	0	0
Purchase of treasury stock	0	0	0
Excess tax benefits from stock-based compensation	0	0	0
Debt issuance costs		0	0
Proceeds from exercise of stock options	0	0	0
Proceeds from contributions from affiliates	(3,284,000)	(20,586,000)
Dividends paid	1,570,000	0	0
Net cash used in financing activities	(1,714,000)	(20,586,000)	0
Net change in cash and cash equivalents	0	0	0
Effect of foreign exchange rate changes on cash and cash equivalents	0	0	0
Cash and cash equivalents at beginning of period	0	0	0
Cash and cash equivalents at end of period	0	0	0
Consolidated [Member]
Net cash provided by (used in) by operating activities	153,913,000	150,122,000	131,369,000
CASH FLOWS FROM INVESTING ACTIVITIES
Investment in property and equipment	(33,397,000)	(15,443,000)	(10,924,000)
Equity method investments	(5,685,000)	(20,285,000)	(5,000,000)
Issuance of mezzanine and other notes receivable	(1,095,000)	(23,736,000)	(9,227,000)
Collections of mezzanine and other notes receivable	9,748,000	3,270,000	4,690,000
Proceeds from sale of assets			1,654,000
Purchases of investments, employee benefit plans	(2,676,000)	(1,697,000)	(1,602,000)
Proceeds from sales of investments, employee benefit plans	4,168,000	11,223,000	644,000
Advances to and investments in affiliates	0	0
Other items, net	(485,000)	(433,000)	(564,000)
Net cash used in investing activities	(29,422,000)	(47,101,000)	(20,329,000)
CASH FLOWS FROM FINANCING ACTIVITIES
Net borrowings (repayments) pursuant to revolving credit facilities	(57,000,000)	57,000,000	(200,000)
Principal payments on long-term debt	(8,204,000)	(4,422,000)	(297,000)
Proceeds from the issuance of long-term debt	3,360,000	543,500,000	75,000
Purchase of treasury stock	(3,965,000)	(22,586,000)	(53,617,000)
Excess tax benefits from stock-based compensation	1,460,000	1,559,000	1,227,000
Debt issuance costs		(4,759,000)	(2,356,000)
Proceeds from exercise of stock options	8,864,000	7,090,000	3,845,000
Proceeds from contributions from affiliates	0	0
Dividends paid	(32,799,000)	(654,092,000)	(43,747,000)
Net cash used in financing activities	(88,284,000)	(76,710,000)	(95,070,000)
Net change in cash and cash equivalents	36,207,000	26,311,000	15,970,000
Effect of foreign exchange rate changes on cash and cash equivalents	(2,589,000)	809,000	(172,000)
Cash and cash equivalents at beginning of period	134,177,000	107,057,000	91,259,000
Cash and cash equivalents at end of period	$ 167,795,000	$ 134,177,000	$ 107,057,000