CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
OPERATING ACTIVITIES:
Net Income	$ 58,557	$ 77,595
Adjustments to reconcile net income to net cash provided by operating activities:
Stock-based compensation expense	5,999	6,105
Depreciation	29,090	30,140
Intangible amortization	29,089	18,274
Deferred income taxes	8,722	6,932
Other, net	3,020	(2,644)
Changes in operating assets and liabilities, net of effect of acquisitions and divestitures:
Accounts receivable	25,546	(3,918)
Accounts payable	(15,162)	(15,203)
Accrued liabilities	14,138	21,151
Other assets and liabilities	16,321	18,517
Net cash provided by operating activities	175,320	156,949
INVESTING ACTIVITIES:
Payments for acquisitions, net of cash acquired	(16,871)	(24,884)
Capital expenditures	(33,136)	(34,185)
Proceeds from sale of property and equipment	250	766
Other		7
Net cash used in investing activities	(49,757)	(58,296)
FINANCING ACTIVITIES:
Repayments of long-term debt and other obligations	(12,779)	(6,879)
Proceeds from foreign bank debt	301	15,607
Repayments of foreign bank debt	(2,936)	(18,721)
Repayment of term loan	(30,000)	(171,000)
Proceeds from senior credit facility	383,929	457,959
Repayments of senior credit facility	(446,248)	(353,520)
Payments of capital lease obligations	(940)	(1,381)
Payments for repurchase of mandatory convertible preferred stock	(9,570)
Payments for repurchase of common stock		(37,693)
Proceeds from issuance of common stock	3,503	22,310
Dividends paid on mandatory convertible preferred stock	(9,364)	(10,106)
Payments to noncontrolling interests		(4,997)
Net cash used in financing activities	(124,104)	(108,421)
Effect of exchange rate changes on cash and cash equivalents	1,375	(211)
Net change in cash and cash equivalents	2,834	(9,979)
Cash and cash equivalents at beginning of period	44,189	55,634
Cash and cash equivalents at end of period	47,023	45,655
NON-CASH ACTIVITIES:
Issuances of obligations for acquisitions	$ 13,945	$ 13,013