Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Cash Flows from Operating Activities
Net (loss) income	$ 36,506	$ 28,102
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	19,718	37,823
Amortization of debt issuance costs	433	267
Deferred income taxes	(13,249)	(15,911)
Provision for credit losses	2,018	10,588
Provision for service credits	4,528	6,736
Stock-based compensation expense (benefit)	1,971	(6,064)
Other components of net periodic pension cost	(453)	201
Loss on early extinguishment of debt	299	0
Loss on disposal/write-off of fixed assets and capitalized software	15	2,962
Impairment charges	0	98
Non-cash loss from remeasurement of indemnification asset	0	3,801
Gain (loss) on foreign currency exchange rates	835	0
Other, net	6	0
Changes in working capital items, excluding acquisitions:
Accounts receivable	26,846	(8,921)
Contract assets	1,446	(522)
Prepaid expenses and other assets	(10,998)	(4,583)
Accounts payable and accrued liabilities	(67,458)	(33,981)
Accrued income taxes, net	9,597	30,351
Operating lease liability	(403)	(2,620)
Contract liabilities	2,547	(2,685)
Net cash provided by operating activities	14,204	45,642
Cash Flows from Investing Activities
Additions to fixed assets and capitalized software	(3,668)	(9,122)
Proceeds from the sale of building and fixed assets	0	1,502
Acquisition of a business, net of cash acquired	(174,190)	0
Net cash (used in) investing activities	(177,858)	(7,620)
Cash Flows from Financing Activities
Proceeds from New Term Loan	418,070	0
Proceeds from New Term Loan, related party	260,930	0
Payments of Senior Term Loan	(335,821)	(23,445)
Payments of Senior Term Loan, related party	(113,789)	(10,555)
Proceeds from ABL Facility	249,936	329,719
Payments of ABL Facility	(285,492)	(312,624)
Purchase of treasury stock	0	(21,770)
Other	(2,038)	(56)
Net cash provided by (used in) financing activities	191,796	(38,731)
Effect of exchange rate changes on cash and cash equivalents	(707)	0
Increase (decrease) in cash and cash equivalents	27,435	(709)
Cash and cash equivalents, beginning of period	2,406	1,912
Cash and cash equivalents, end of period	29,841	1,203
Supplemental Information
Interest expense	17,286	20,802
Cash paid (received) for income taxes, net	$ 15,753	$ (1,031)