Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Cash Flows from Operating Activities
Net income	$ 101,577	$ 149,221	$ 35,504
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	105,473	146,523	206,270
Amortization of debt issuance costs	4,919	1,068	1,123
Deferred income taxes	(20,438)	(147,329)	(25,118)
Provision for credit losses	8,031	32,077	30,092
Provision for service credits	11,363	32,550	25,467
Stock-based compensation expense (benefit)	8,094	(2,895)	14,119
Other components of net periodic pension (benefit) cost	(14,829)	42,236	53,161
Loss on termination of leaseback obligations	3,409	0	6,375
(Gain) loss on disposal/write-off of fixed assets and capitalized software	(5,536)	3,544	5,942
Impairment charges	3,611	24,911	5,670
(Gain) loss from remeasurement of indemnification asset	(1)	5,443	4,093
Other, net	304	0	0
Changes in working capital items, excluding acquisitions:
Accounts receivable	74,368	41,382	16,457
Contract assets	5,628	369	1,515
Prepaid expenses and other assets	6,084	472	5,676
Accounts payable and accrued liabilities	(125,883)	(86,161)	(64,868)
Operating lease liability	(3,370)	(4,006)	(10,587)
Contract liabilities	7,767	(5,737)	(6,391)
Settlement of stock option liability	0	(896)	(33,901)
Net cash provided by operating activities	170,571	232,772	270,599
Cash Flows from Investing Activities
Additions to fixed assets and capitalized software	(26,849)	(27,757)	(26,065)
Proceeds from the sale of assets	6,836	1,546	847
Acquisition of a business, net of cash acquired	(175,370)	0	(147)
Other	(1,192)	0	0
Net cash (used in) investing activities	(196,575)	(26,211)	(25,365)
Cash Flows from Financing Activities
Proceeds from ABL Facility	1,046,249	1,143,700	1,142,717
Payments of ABL Facility	(1,085,558)	(1,169,446)	(1,184,310)
Purchase of treasury stock	0	(30,626)	(437,962)
Proceeds from exercise of stock options	7,047	11,241	439
Proceeds from exercise of stock warrants	13,920	0	0
Proceeds from private placement	0	445	0
Payments of lease obligations	(10,532)	(411)	(1,226)
Other	(3,428)	(580)	(774)
Net cash provided by (used in) financing activities	39,088	(206,067)	(277,491)
Effect of exchange rate changes on cash and cash equivalents	(1,933)	0	0
Increase (decrease) in cash and cash equivalents and restricted cash	11,151	494	(32,257)
Cash and cash equivalents and restricted cash, beginning of period	2,406	1,912	34,169
Cash and cash equivalents and restricted cash, end of period	13,557	2,406	1,912
Supplemental Information
Cash paid for interest	66,737	72,931	81,543
Cash paid for income taxes, net	63,893	24,799	38,091
New Term Loan
Cash Flows from Financing Activities
Proceeds from New Term Loan	418,070	0	0
Proceeds from related party debt	260,930	0	0
Repayments of term loan	(110,215)	0	0
Repayments of term loan, related party	(47,785)	0	0
Senior Term Loan
Cash Flows from Financing Activities
Proceeds from New Term Loan	0	0	193,625
Proceeds from related party debt	0	0	225,000
Repayments of term loan	(335,821)	(113,747)	(148,256)
Repayments of term loan, related party	$ (113,789)	$ (46,643)	$ (66,744)