CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
OPERATING ACTIVITIES:
Net Income	$ 77,595	$ 75,810
Adjustments to reconcile net income to net cash provided by operating activities:
Stock compensation expense	6,105	5,487
Excess tax benefit of stock options exercised	0	(8,222)
Depreciation	30,140	18,766
Amortization	18,274	8,797
Deferred income taxes	6,932	(2,957)
Other, net	(2,644)	5,313
Changes in operating assets and liabilities, net of effect of acquisitions:
Accounts receivable	(3,918)	(14,491)
Accounts payable	(15,203)	5,443
Accrued liabilities	21,151	35,924
Deferred revenues	487	(628)
Other assets and liabilities	18,030	3,312
Net cash provided by operating activities	156,949	132,554
INVESTING ACTIVITIES:
Payments for acquisitions, net of cash acquired	(24,884)	(34,210)
Proceeds from investments	7	257
Proceeds from sale of property and equipment	766	0
Capital expenditures	(34,185)	(21,356)
Net cash used in investing activities	(58,296)	(55,309)
FINANCING ACTIVITIES:
Repayments of long-term debt and other obligations	(6,879)	(9,780)
Proceeds from foreign bank debt	15,607	4,851
Repayments of foreign bank debt	(18,721)	(38,252)
Proceeds from term loan	0	250,000
Repayment of term loan	(171,000)	0
Proceeds from senior credit facility	457,959	394,097
Repayments of senior credit facility	(353,520)	(670,254)
Payments of capital lease obligations	(1,381)	(988)
Payment of cash flow hedge	0	(8,833)
Purchases and cancellations of treasury stock	(37,693)	(11,516)
Proceeds from issuance of common stock	22,310	27,452
Dividends paid on mandatory convertible preferred stock	(10,106)	0
Excess tax benefit of stock options exercised	0	8,222
Payments to noncontrolling interests	(4,997)	(2,603)
Net cash used in financing activities	(108,421)	(57,604)
Effect of exchange rate changes on cash and cash equivalents	(211)	(3,594)
Net (decrease)/ increase in cash and cash equivalents	(9,979)	16,047
Cash and cash equivalents at beginning of period	55,634	22,236
Cash and cash equivalents at end of period	45,655	38,283
NON-CASH INVESTING ACTIVITIES:
Issuances of obligations for acquisitions	$ 13,013	$ 21,543