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UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Cash flows from operating activities:    
Net income $ 23,838 $ 4,299
Adjustments to reconcile net income to cash provided by (used in) operating activities:    
Stock-based compensation 4,975 4,109
Depreciation and amortization 16,181 18,104
Impairment and other losses 875 19,001
Adjustment to deferred acquisition consideration 17,297 (2,288)
Deferred income taxes 39 2,114
Foreign exchange and other (8,219) (4,578)
Changes in working capital:    
Accounts receivable (51,950) 88,039
Expenditures billable to clients (6,241) 10,707
Prepaid expenses and other current assets (7,622) (4,363)
Accounts payable, accruals and other liabilities (13,615) (127,188)
Acquisition related payments (23,440) (6,215)
Advance billings 58,291 (35,422)
Net cash provided by (used in) operating activities 10,409 (33,681)
Cash flows from investing activities:    
Capital expenditures (15,381) (3,690)
Proceeds from sale of assets 7,080 19,616
Acquisitions, net of cash acquired 0 (729)
Other (1,273) (554)
Net cash provided by (used in) investing activities (9,574) 14,643
Repayment of borrowing under revolving credit facility    
Repayment of borrowing under revolving credit facility (291,913) (251,328)
Proceeds from revolving credit facility 380,515 313,828
Acquisition related payments (21,435) (30,885)
Distributions to noncontrolling interests and other (20,269) (11,050)
Repurchase of Bonds 0 21,999
Net cash provided by (used in) financing activities 46,898 (1,434)
Effect of exchange rate changes on cash and cash equivalents (210) (981)
Net increase in cash and cash equivalents 47,523 (21,453)
Cash and cash equivalents at beginning of period 60,757 106,933
Cash and cash equivalents at end of period 108,280 85,480
Supplemental disclosures:    
Cash income taxes paid 7,901 2,566
Cash interest paid $ 32,806 $ 28,736