CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015
OPERATING ACTIVITIES:
Net Income	$ 123,825	$ 117,569
Adjustments to reconcile net income to net cash provided by operating activities:
Stock compensation expense	11,557	10,904
Excess tax benefit of stock options exercised	0	(10,899)
Depreciation	61,851	37,225
Amortization	69,183	17,718
Deferred income taxes	4,515	(8,390)
Other, net	(2,644)	5,686
Changes in operating assets and liabilities, net of effect of acquisitions:
Accounts receivable	(12,888)	(51,041)
Accounts payable	(1,496)	21,019
Accrued liabilities	(13,303)	51,071
Deferred revenues	305	(3,156)
Other assets and liabilities	4,535	(9,046)
Net cash provided by operating activities	245,440	178,660
INVESTING ACTIVITIES:
Payments for acquisitions, net of cash acquired	(42,097)	(61,766)
Proceeds from investments	7	271
Proceeds from sale of property and equipment	1,355	0
Capital expenditures	(67,133)	(46,794)
Net cash used in investing activities	(107,868)	(108,289)
FINANCING ACTIVITIES:
Repayments of long-term debt and other obligations	(31,789)	(39,590)
Proceeds from foreign bank debt	27,619	18,363
Repayments of foreign bank debt	(36,953)	(43,769)
Proceeds from term loan	0	250,000
Repayment of term loan	(250,000)	0
Proceeds from senior credit facility	902,817	879,024
Repayments of senior credit facility	(715,653)	(1,072,468)
Payments of capital lease obligations	(2,605)	(1,951)
Payment of cash flow hedge	0	(8,833)
Payments for repurchase of common stock	(40,814)	(85,149)
Payments for repurchase of convertible preferred stock	(5,025)	0
Proceeds from issuance of common stock	30,308	39,208
Dividends paid on mandatory convertible preferred stock	(20,127)	0
Excess tax benefit of stock options exercised	0	10,899
Payments to noncontrolling interests	(6,961)	(2,603)
Net cash used in financing activities	(149,183)	(56,869)
Effect of exchange rate changes on cash and cash equivalents	297	(2,782)
Net (decrease)/ increase in cash and cash equivalents	(11,314)	10,720
Cash and cash equivalents at beginning of period	55,634	22,236
Cash and cash equivalents at end of period	44,320	32,956
NON-CASH INVESTING ACTIVITIES:
Issuances of obligations for acquisitions	$ 23,069	$ 47,827