Consolidated Statements of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014
Cash flows from operating activities
Net income	$ 35,528	$ 39,433
Adjustment to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	31,043	27,259
Amortization of contract acquisition costs	537	657
Amortization of debt issuance costs	356	349
Imputed interest expense and fair value adjustments to contingent consideration	(123)	(3,710)
Provision for doubtful accounts	406	219
Gain on disposal of assets	(69)	0
Deferred income taxes	(341)	5,035
Excess tax benefit from equity-based awards	(409)	(1,050)
Equity-based compensation expense	5,278	5,881
Loss (gain) on foreign currency derivatives	2,600	(2,955)
Changes in assets and liabilities, net of acquisitions:
Accounts receivable	9,191	(9,238)
Prepaids and other assets	790	(631)
Accounts payable and accrued expenses	13,282	(22,965)
Deferred revenue and other liabilities	(12,556)	(6,654)
Net cash provided by operating activities	85,513	31,630
Cash flows from investing activities
Proceeds from sale of long lived assets	116	135
Purchases of property, plant and equipment, net of acquisitions	(29,505)	(34,483)
Investments in non-marketable equity investments	(9,000)	0
Acquisitions, net of cash acquired of zero and $812, respectively	(1,775)	(8,732)
Net cash used in investing activities	(40,164)	(43,080)
Cash flows from financing activities
Proceeds from line of credit	1,185,200	1,001,500
Payments on line of credit	(1,170,200)
Proceeds from other debt	0	0
Payments on other debt	(1,720)	(3,127)
Payments of contingent consideration related to acquisitions	(11,883)	(8,547)
Dividends paid to shareholders	(8,710)	0
Dividends distributed to noncontrolling interest	(2,657)	(3,713)
Proceeds from exercise of stock options	432	313
Excess tax benefit from equity-based awards	409	1,050
Purchase of treasury stock	(12,254)	(37,049)
Payments of debt issuance costs	(35)	0
Net cash used in financing activities	(21,418)	(51,073)
Effect of exchange rate changes on cash and cash equivalents	(7,405)	2,284
(Decrease) increase in cash and cash equivalents	16,526	(60,239)
Cash and cash equivalents, beginning of period	77,316	158,017
Cash and cash equivalents, end of period	93,842	97,778
Supplemental disclosures
Cash paid for interest	2,693	2,670
Cash paid for income taxes	7,761	7,486
Non-cash investing and financing activities
Acquisition of equipment through increase in accounts payable	2,625	1,420
Acquisition of long lived assets through capital leases	$ 5,353	$ 0