Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income	$ 77,534	$ 130,081
Adjustments to reconcile net income to net cash flows from operating activities:
Income from discontinued operations, net of income taxes	0	(32,224)
Depreciation	57,458	54,194
Amortization	39,944	39,469
Provision for share-based compensation	13,841	11,411
Deferred income tax (benefit) expense	(3,755)	2,202
Amortization of deferred financing costs	44,053	10,009
Increase in acquisition contingent consideration	644	0
(Gain) loss on sale of property and equipment	(12,607)	220
Changes in operating assets and liabilities
Accounts receivable	(13,957)	(20,977)
Other assets	6,852	(23,675)
Accounts payable	(10,830)	18,812
Accrued wages and benefits	4,168	(3,741)
Accrued interest	(8,420)	(19,524)
Other liabilities and income tax payable	2,560	(9,733)
Net cash flows from continuing operating activities	197,485	156,524
Net cash flows from discontinued operating activities	0	(6,962)
Total net cash flows from operating activities	197,485	149,562
CASH FLOWS FROM INVESTING ACTIVITIES:
Business acquisitions	(9,745)	(17,296)
Purchases of property and equipment	(73,864)	(64,864)
Proceeds from the sale of property and equipment	38,368	0
Other	2,657	(1,561)
Net cash flows from continuing investing activities	(42,584)	(83,721)
Net cash flows from discontinued investing activities	0	269,540
Total net cash flows from investing activities	(42,584)	185,819
CASH FLOWS FROM FINANCING ACTIVITIES:
Principal repayments on long-term obligations	(2,286,906)	(16,246)
Proceeds from issuance of notes	400,000	0
Payments on revolving credit facilities	(10,000)	(324,000)
Payment of deferred financing and other debt-related costs	(25,273)	(234)
Proceeds from stock options and ESPP shares including excess tax benefits	3,927	8,462
Dividends paid	(37,333)	(37,767)
Repurchase of common stock	(21,961)	(59,957)
Net cash flows from continuing financing activities	(112,546)	(290,742)
Net cash flows from discontinued financing activities	0	0
Total net cash flows from financing activities	(112,546)	(290,742)
EFFECT OF EXCHANGE RATES ON CASH AND CASH EQUIVALENTS	(1,278)	(1,208)
NET CHANGE IN CASH AND CASH EQUIVALENTS	41,077	43,431
CASH AND CASH EQUIVALENTS, Beginning of period	182,338	115,061
CASH AND CASH EQUIVALENTS, End of period	223,415	158,492
Term Loan Facility
CASH FLOWS FROM FINANCING ACTIVITIES:
Proceeds from facilities	1,780,000	0
Revolving Credit Facility
CASH FLOWS FROM FINANCING ACTIVITIES:
Proceeds from facilities	$ 85,000	$ 139,000