CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015
OPERATING ACTIVITIES:
Net Income	$ 188,998	$ 187,475
Adjustments to reconcile net income to net cash provided by operating activities:
Stock compensation expense	16,671	16,158
Excess tax benefit of stock options exercised	0	(15,483)
Depreciation	94,079	55,476
Amortization	102,311	26,957
Deferred income taxes	20,579	(15,218)
Other, net	(2,296)	5,686
Changes in operating assets and liabilities, net of effect of acquisitions:
Accounts receivable	(26,825)	(66,352)
Accounts payable	681	29,170
Accrued liabilities	6,141	77,820
Deferred revenues	(1,230)	(3,412)
Other assets and liabilities	18,659	(4,986)
Net cash provided by operating activities	417,768	293,291
INVESTING ACTIVITIES:
Payments for acquisitions, net of cash acquired	(51,197)	(97,098)
Proceeds from/(purchases of) investments	7	(635,919)
Proceeds from insurance settlement	2,358
Proceeds from sale of property and equipment	1,316	0
Capital expenditures	(100,981)	(72,566)
Net cash used in investing activities	(148,497)	(805,583)
FINANCING ACTIVITIES:
Repayments of long-term debt and other obligations	(52,462)	(61,805)
Proceeds from foreign bank debt	68,711	42,535
Repayments of foreign bank debt	(68,211)	(76,387)
Proceeds from term loan		250,000
Repayment of term loan	(250,000)	(250,000)
Proceeds from private placement of long-term note		300,000
Repayment of private placement of long-term note		(100,000)
Proceeds from senior credit facility	1,205,270	1,338,140
Repayments of senior credit facility	(1,118,831)	(1,614,968)
Payments of capital lease obligations	(4,644)	(2,813)
Payments of deferred financing costs	(605)
Payment for hedge		(8,833)
Payments for repurchase of common stock	(40,814)	(103,029)
Payments for repurchase of mandatory convertible preferred stock	(24,263)
Proceeds from issuance of mandatory convertible preferred stock		746,900
Proceeds from issuance of common stock	35,727	53,529
Dividends paid on mandatory convertible preferred stock	(29,853)	0
Excess tax benefit of stock options exercised	0	15,483
Payments to noncontrolling interests	(6,961)	(5,236)
Net cash (used in)/provided by financing activities	(286,936)	523,516
Effect of exchange rate changes on cash and cash equivalents	2,322	(577)
Net (decrease)/ increase in cash and cash equivalents	(15,343)	10,647
Cash and cash equivalents at beginning of period	55,634	22,236
Cash and cash equivalents at end of period	40,291	32,883
NON-CASH INVESTING ACTIVITIES:
Issuances of obligations for acquisitions	$ 31,394	$ 71,905