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	$ 60,865	$ 39,566
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	49,626	75,429
Amortization of debt issuance costs	1,930	534
Deferred income taxes	(51,439)	(42,150)
Provision for credit losses	292	22,436
Provision for service credits	8,719	17,197
Stock-based compensation expense (benefit)	3,892	(5,484)
Other components of net periodic pension (benefit) cost	(725)	1,137
Loss on termination of leaseback obligations	3,409	0
(Gain) loss on disposal/write-off of fixed assets and capitalized software	(44)	3,491
Impairment charges	3,611	18,230
Non-cash (gain) loss from remeasurement of indemnification asset	(844)	4,418
Loss on foreign currency exchange rates	640	0
Other, net	(17)	0
Changes in working capital items, excluding acquisitions:
Accounts receivable	70,491	(28,791)
Contract assets	2,402	(2,050)
Prepaid expenses and other assets	(7,567)	3,177
Accounts payable and accrued liabilities	(51,133)	(67,064)
Accrued income taxes, net	3,258	64,821
Operating lease liability	(2,407)	(3,482)
Contract liabilities	(13,157)	(3,544)
Net cash provided by operating activities	81,802	97,871
Cash Flows from Investing Activities
Additions to fixed assets and capitalized software	(14,315)	(12,975)
Proceeds from the sale of building and fixed assets	63	1,502
Acquisition of a business, net of cash acquired	(174,190)	0
Net cash (used in) investing activities	(188,442)	(11,473)
Cash Flows from Financing Activities
Proceeds from New Term Loan	418,070	0
Proceeds from New Term Loan, related party	260,930	0
Proceeds from ABL Facility	545,809	606,455
Payments of ABL Facility	(567,025)	(596,969)
Purchase of treasury stock	0	(30,626)
Other	3,305	(191)
Net cash provided by (used in) financing activities	123,479	(86,721)
Effect of exchange rate changes on cash and cash equivalents	(819)	0
Increase (decrease) in cash and cash equivalents and restricted cash	16,020	(323)
Cash and cash equivalents and restricted cash, beginning of period	2,406	1,912
Cash and cash equivalents and restricted cash, end of period	18,426	1,589
Supplemental Information
Interest expense	37,608	39,671
Cash paid for income taxes, net	38,411	11,902
Senior Term Loan, related party, net
Cash Flows from Financing Activities
Repayments of term loan	(335,821)	(45,090)
Repayments of term loan, related party	(113,789)	(20,300)
New Term Loan
Cash Flows from Financing Activities
Repayments of term loan	(62,089)	0
Repayments of term loan, related party	$ (25,911)	$ 0