Guarantor Condensed Consolidating Statements of Cash Flows (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Condensed Cash Flow Statements, Captions [Line Items]
Net cash (used in) provided by operating activities	$ 127,887	$ 151,124
Capital expenditures	(25,222)	(22,569)
Acquisitions, net of cash acquired	(779)	0
Proceeds from divestitures and sales of property and equipment	2,639	1,816
Net withdrawals (deposits) of restricted funds and other	(12,225)	339
Contributions to subsidiaries	0	0
Net cash (used in) provided by investing activities	(35,587)	(20,414)
Proceeds from issuance of long-term debt	110,000	0
Payments of debt	(7,579)	(4,948)
Early extinguishment of debt	(167,093)
Principal payments on capital leases	(7,231)	(6,468)
Proceeds from exercise of stock options	7,915	3,094
Excess tax benefits from share based awards	6,744	772
Purchase of Company common stock	(1,053)	(1,708)
Payments of dividends	(17,080)	(12,698)
Purchase of noncontrolling interest	(15,000)	(8,333)
Bank overdrafts and other	3,762	(4,004)
Contributions from (distributions to) parent	0	0
Net cash provided by (used in) financing activities	(86,615)	(34,293)
Effect of foreign currency	(1,939)	(579)
Net increase (decrease) in cash and cash equivalents	3,746	95,838
Cash and cash equivalents at beginning of period	144,873	92,708
Cash and cash equivalents at end of period	148,619	188,546
Parent Company [Member]
Condensed Cash Flow Statements, Captions [Line Items]
Net cash (used in) provided by operating activities	(28,168)	(1,261)
Capital expenditures	0	0
Acquisitions, net of cash acquired	0
Proceeds from divestitures and sales of property and equipment	0	0
Net withdrawals (deposits) of restricted funds and other	0	0
Contributions to subsidiaries	(70,858)	16,558
Net cash (used in) provided by investing activities	(70,858)	16,558
Proceeds from issuance of long-term debt	110,000
Payments of debt	(7,500)	(4,757)
Early extinguishment of debt	0
Principal payments on capital leases	0	0
Proceeds from exercise of stock options	7,915	3,094
Excess tax benefits from share based awards	6,744	772
Purchase of Company common stock	(1,053)	(1,708)
Payments of dividends	(17,080)	(12,698)
Purchase of noncontrolling interest
Bank overdrafts and other	0	0
Contributions from (distributions to) parent	0	0
Net cash provided by (used in) financing activities	99,026	(15,297)
Effect of foreign currency	0	0
Net increase (decrease) in cash and cash equivalents	0	0
Cash and cash equivalents at beginning of period	0	0
Cash and cash equivalents at end of period	0	0
Subsidiary Issuer [Member]
Condensed Cash Flow Statements, Captions [Line Items]
Net cash (used in) provided by operating activities	(32,202)
Capital expenditures	0
Acquisitions, net of cash acquired	0
Proceeds from divestitures and sales of property and equipment	0
Net withdrawals (deposits) of restricted funds and other	2,035
Contributions to subsidiaries	0
Net cash (used in) provided by investing activities	2,035
Proceeds from issuance of long-term debt	0
Payments of debt	0
Early extinguishment of debt	(167,093)
Principal payments on capital leases	0
Proceeds from exercise of stock options	0
Excess tax benefits from share based awards	0
Purchase of Company common stock	0
Payments of dividends	0
Purchase of noncontrolling interest
Bank overdrafts and other	0
Contributions from (distributions to) parent	165,058
Net cash provided by (used in) financing activities	(2,035)
Effect of foreign currency	0
Net increase (decrease) in cash and cash equivalents	(32,202)
Cash and cash equivalents at beginning of period	53,543
Cash and cash equivalents at end of period	21,341
Guarantor Subsidiaries [Member]
Condensed Cash Flow Statements, Captions [Line Items]
Net cash (used in) provided by operating activities	47,998
Capital expenditures	(4,120)
Acquisitions, net of cash acquired	0
Proceeds from divestitures and sales of property and equipment	0
Net withdrawals (deposits) of restricted funds and other	(14,260)
Contributions to subsidiaries	0
Net cash (used in) provided by investing activities	(18,380)
Proceeds from issuance of long-term debt	0
Payments of debt	0
Early extinguishment of debt	0
Principal payments on capital leases	(23)
Proceeds from exercise of stock options	0
Excess tax benefits from share based awards	0
Purchase of Company common stock	0
Payments of dividends	0
Purchase of noncontrolling interest	0
Bank overdrafts and other	0
Contributions from (distributions to) parent	(30,740)
Net cash provided by (used in) financing activities	(30,763)
Effect of foreign currency	0
Net increase (decrease) in cash and cash equivalents	(1,145)
Cash and cash equivalents at beginning of period	1,898
Cash and cash equivalents at end of period	753
Non-Guarantor Subsidiaries [Member]
Condensed Cash Flow Statements, Captions [Line Items]
Net cash (used in) provided by operating activities	140,259	152,385
Capital expenditures	(21,102)	(22,569)
Acquisitions, net of cash acquired	(779)
Proceeds from divestitures and sales of property and equipment	2,639	1,816
Net withdrawals (deposits) of restricted funds and other	0	339
Contributions to subsidiaries	0	0
Net cash (used in) provided by investing activities	(19,242)	(20,414)
Proceeds from issuance of long-term debt	0
Payments of debt	(79)	(191)
Early extinguishment of debt	0
Principal payments on capital leases	(7,208)	(6,468)
Proceeds from exercise of stock options	0	0
Excess tax benefits from share based awards	0	0
Purchase of Company common stock	0	0
Payments of dividends	0	0
Purchase of noncontrolling interest	(15,000)	(8,333)
Bank overdrafts and other	3,762	(4,004)
Contributions from (distributions to) parent	(63,460)	(16,558)
Net cash provided by (used in) financing activities	(81,985)	(35,554)
Effect of foreign currency	(1,939)	(579)
Net increase (decrease) in cash and cash equivalents	37,093	95,838
Cash and cash equivalents at beginning of period	89,432	92,708
Cash and cash equivalents at end of period	126,525	188,546
Consolidation, Eliminations [Member]
Condensed Cash Flow Statements, Captions [Line Items]
Net cash (used in) provided by operating activities	0	0
Capital expenditures	0	0
Acquisitions, net of cash acquired	0
Proceeds from divestitures and sales of property and equipment	0	0
Net withdrawals (deposits) of restricted funds and other	0	0
Contributions to subsidiaries	70,858	(16,558)
Net cash (used in) provided by investing activities	70,858	(16,558)
Proceeds from issuance of long-term debt	0
Payments of debt	0	0
Early extinguishment of debt	0
Principal payments on capital leases	0	0
Proceeds from exercise of stock options	0	0
Excess tax benefits from share based awards	0	0
Purchase of Company common stock	0	0
Payments of dividends	0	0
Purchase of noncontrolling interest	0
Bank overdrafts and other	0	0
Contributions from (distributions to) parent	(70,858)	16,558
Net cash provided by (used in) financing activities	(70,858)	16,558
Effect of foreign currency	0	0
Net increase (decrease) in cash and cash equivalents	0	0
Cash and cash equivalents at beginning of period	0	0
Cash and cash equivalents at end of period	$ 0	$ 0