Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Cash flows from operating activities
Net income	$ 20,476	$ 5,932
Adjustment to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	16,743	17,924
Amortization of contract acquisition costs	253	362
Amortization of debt issuance costs	556	247
Imputed interest expense and fair value adjustments to contingent consideration	1,364	2,011
Provision for doubtful accounts		124
(Gain) loss on disposal of assets	7	18
Impairment losses	1,506	1,120
Impairment of equity investment		15,632
Gain (adjustment) on bargain purchase of a business		(685)
Deferred income taxes	(2,358)	(972)
Excess tax benefit from equity-based awards	(320)	(227)
Equity-based compensation expense	3,168	3,609
(Gain) loss on foreign currency derivatives	(42)	725
Changes in assets and liabilities, net of acquisitions:
Accounts receivable	18,580	41,197
Prepaids and other assets	5,869	2,337
Accounts payable and accrued expenses	25,616	2,720
Deferred revenue and other liabilities	(11,455)	(24,687)
Net cash provided by operating activities	79,963	67,387
Cash flows from investing activities
Proceeds from sale of long-live assets	15	4
Purchases of property, plant and equipment	(13,200)	(7,508)
Investments in non-marketable equity investments		(2,119)
Acquisitions, net of cash acquired of zero and zero, respectively		(460)
Net cash used in investing activities	(13,185)	(10,083)
Cash flows from financing activities
Proceeds from line of credit	253,600	630,800
Payments on line of credit	(293,600)	(672,300)
Payments on other debt	(4,498)	(1,563)
Payments of contingent consideration and hold back payments to acquisitions	(5,537)	(399)
Payments to noncontrolling interest	(900)	(945)
Capital contribution from noncontrolling interest	1,330
Tax payments related to issuance of restricted stock units	(1,773)	(1,722)
Payments of debt issuance costs	(1,729)
Net cash (used in) provided by financing activities	(53,107)	(46,129)
Effect of exchange rate changes on cash, cash equivalents and restricted cash	(469)	(4,018)
Increase (decrease) in cash, cash equivalents and restricted cash	13,202	7,157
Cash, cash equivalents and restricted cash, beginning of period	78,237	74,437
Cash, cash equivalents and restricted cash, end of period	91,439	81,594
Supplemental disclosures
Cash paid for interest	3,360	4,201
Cash paid for income taxes	2,476	4,143
Non-cash investing and financing activities
Acquisition of long lived assets through capital leases	3,617	4,048
Acquisition of equipment through increase in accounts payable, net	1,780	(372)
Dividends declared but not paid	$ 13,864	$ 12,414