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Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Cash flows from operating activities    
Net income $ 34,090 $ 12,229
Adjustment to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 33,793 34,735
Amortization of contract acquisition costs 488 758
Amortization of debt issuance costs 735 494
Imputed interest expense and fair value adjustments to contingent consideration (555) 5,128
Provision for doubtful accounts   257
(Gain) loss on disposal of assets 34 35
Impairment losses 3,569 1,120
Impairment of equity investment   15,632
Gain (adjustment) on bargain purchase of a business   (685)
Non-cash loss on assets held for sale reclassified to assets held and used   2,000
Deferred income taxes (2,724) (2,327)
Excess tax benefit from equity-based awards (557) (274)
Equity-based compensation expense 6,534 6,183
(Gain) loss on foreign currency derivatives (232) 149
Changes in assets and liabilities, net of acquisitions:    
Accounts receivable 27,688 65,698
Prepaids and other assets 13,103 (37)
Accounts payable and accrued expenses 62,770 (9,943)
Deferred revenue and other liabilities (57,470) (26,446)
Net cash provided by operating activities 121,266 104,706
Cash flows from investing activities    
Proceeds from sale of long-live assets 327 8
Purchases of property, plant and equipment (28,428) (16,883)
Investments in non-marketable equity investments   (2,119)
Acquisitions, net of cash acquired of zero and $4.5 million, respectively   (2,002)
Net cash used in investing activities (28,101) (20,996)
Cash flows from financing activities    
Proceeds from line of credit 540,200 1,093,800
Payments on line of credit (594,200) (1,148,800)
Payments on other debt (7,016) (2,841)
Payments of contingent consideration and hold back payments to acquisitions (5,902) (785)
Dividends paid to shareholders (13,864) (12,414)
Payments to noncontrolling interest (2,250) (1,125)
Capital contribution from noncontrolling interest 3,362  
Tax payments related to issuance of restricted stock units (3,223) (2,287)
Payments of debt issuance costs (1,819) (35)
Net cash (used in) provided by financing activities (84,712) (74,487)
Effect of exchange rate changes on cash, cash equivalents and restricted cash 239 (12,400)
Increase (decrease) in cash, cash equivalents and restricted cash 8,692 (3,177)
Cash, cash equivalents and restricted cash, beginning of period 78,237 74,437
Cash, cash equivalents and restricted cash, end of period 86,929 71,260
Supplemental disclosures    
Cash paid for interest 6,844 8,593
Cash paid for income taxes 19,445 20,213
Non-cash investing and financing activities    
Acquisition of long lived assets through capital leases 1,318 7,539
Acquisition of equipment through increase in accounts payable, net $ 221 $ 248