UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019	Dec. 31, 2018
Cash flows from operating activities:
Net loss	$ 2,508	$ 7,333	$ 4,302	$ 7,649
Adjustments to reconcile net income to cash used in operating activities:
Stock-based compensation	1,039	3,634	4,109	6,606
Depreciation and amortization			18,105	19,501
Impairment and other losses	18,839	0	19,000	0	$ 8,599	$ 87,204
Adjustment to deferred acquisition consideration			(2,288)	(5,570)
Deferred income taxes			2,114	2,835
Foreign exchange and other			(4,578)	(6,721)
Changes in working capital:
Accounts receivable			88,039	(21,570)
Expenditures billable to clients			10,707	1,763
Prepaid expenses and other current assets			(4,363)	(3,345)
Accounts payable, accruals and other current liabilities			(127,188)	(66,343)
Acquisition related payments			(6,215)	(4,376)
Advance billings			(35,422)	29,334
Net cash used in operating activities			(33,678)	(40,237)
Cash flows from investing activities:
Capital expenditures	(2,144)	(4,317)	(3,690)	(7,923)
Proceeds from sale of assets			19,616	23,050
Acquisitions, net of cash acquired			(729)	(5,130)
Other investments			(554)	(179)
Net cash provided by investing activities			14,643	9,818
Cash flows from financing activities:
Acquisition related payments			(30,885)	(24,219)
Other			(11,050)	(8,091)
Repurchase of Senior Notes			(21,999)	0
Net cash provided by (used in) financing activities			(1,434)	25,712
Effect of exchange rate changes on cash, cash equivalents, and cash held in trusts			(981)	4
Net decrease in cash and cash equivalents, including cash classified within current assets held for sale			(21,450)	(4,703)
Change in cash and cash equivalents held in trusts classified within held for sale			0	(3,307)
Change in cash and cash equivalents classified within assets held for sale			0	4,441
Net decrease in cash and cash equivalents			(21,450)	(3,569)
Cash and cash equivalents at beginning of period			106,933	30,873	30,873
Cash and cash equivalents at end of period	$ 85,483	$ 27,304	85,483	27,304	$ 106,933	$ 30,873
Supplemental disclosures:
Cash income taxes paid			2,566	3,494
Cash interest paid			28,736	31,643
Wells Fargo Capital Finance, LLC | Revolving Credit Facility
Cash flows from financing activities:
Repayments of borrowings under revolving credit facility			(251,328)	(834,538)
Proceeds from borrowings under revolving credit facility			313,828	793,940
Series 4 Convertible Preferred Stock
Cash flows from financing activities:
Proceeds from issuance of common and convertible preference shares, net of issuance costs			$ 0	$ 98,620