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UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Cash flows from operating activities:    
Net loss $ (22,568) $ 3,784
Adjustments to reconcile net loss to cash used in operating activities:    
Stock-based compensation 10,640 10,490
Depreciation 14,642 11,558
Amortization of intangibles 9,436 10,106
Amortization of deferred finance charges 1,605 1,480
Other asset impairment 2,317 0
Adjustment to deferred acquisition consideration (2,479) 15,792
Acquisition-related contingent consideration payment (23,894) (24,459)
Deferred income tax (9,494) 6,962
Loss on sale of assets (955) (63)
(Earnings) losses of non-consolidated affiliates (58) (502)
Other non-current assets and liabilities (1,114) (1,454)
Foreign exchange 12,128 (6,865)
Changes in working capital:    
Accounts receivable 19,181 (67,889)
Expenditures billable to clients (27,935) (9,223)
Prepaid expenses and other current assets (12,732) 6,511
Accounts payable, accruals and other liabilities (60,015) 13,332
Advance billings 29,582 29,714
Net cash used in operating activities (61,713) (726)
Cash flows used in investing activities:    
Capital expenditures (9,689) (21,156)
Deposits 0 (1,261)
Other investments 867 (465)
Net cash used in investing activities (36,121) (22,882)
Cash flows (used in) provided by financing activities:    
Acquisition related payments (29,172) (40,662)
Repayment of long-term debt (141) (224)
Purchase of shares (493) (630)
Distributions to noncontrolling interests (8,927) (3,840)
Payment of dividends (168) (169)
Net cash provided by financing activities 76,343 17,128
Effect of exchange rate changes on cash and cash equivalents 311 (1,094)
Decrease in cash and cash equivalents (21,180) (7,574)
Cash and cash equivalents at beginning of period 46,179 27,921
Cash and cash equivalents at end of period 24,999 20,347
Supplemental disclosures:    
Cash income taxes paid 2,626 3,423
Cash interest paid 31,414 31,566
Change in cash held in trusts 43,284 185
Non-cash transactions:    
Capital leases 701 545
Dividends payable 286 569
Payments to Acquire Businesses, Net of Cash Acquired 27,299 0
Wells Fargo Capital Finance, LLC | Revolving Credit Facility    
Cash flows (used in) provided by financing activities:    
Repayments of revolving credit agreement (782,600) (791,609)
Proceeds from revolving credit agreement 897,844 763,846
Series 4 Convertible Preferred Stock    
Cash flows (used in) provided by financing activities:    
Proceeds from issuance of convertible preference shares 0 95,000
Convertible Preferred Stock    
Cash flows (used in) provided by financing activities:    
Convertible preference shares issuance costs 0 (4,584)
Common Class A [Member] | Common Stock    
Non-cash transactions:    
Stock Issued During Period, Value, Acquisitions $ 7,030  
Deferred acquisition consideration settled through issuance of shares   $ 28,727