CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Cash flows from operating activities:
Net income	$ 109,001,000	$ 152,913,000	$ 212,967,000
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	51,811,000	79,754,000	80,970,000
Amortization of financing costs and discounts	442,000	1,217,000	1,428,000
Non-cash operating lease costs	4,396,000	5,602,000	7,867,000
Share-based compensation	2,459,000	5,623,000	3,796,000
Provision for doubtful accounts	7,194,000	10,133,000	10,214,000
Deferred income taxes	7,155,000	13,256,000	(56,125,000)
Loss (gain) on sale of businesses	21,797,000	(17,122,000)	0
Lease asset impairments and other charges	9,149,000	0	0
Changes in fair value of contingent consideration	642,000	(161,000)	607,000
Foreign currency remeasurement loss (gain)	181,000	(35,142,000)	0
Goodwill impairment on business	32,629,000	0	0
Loss on extinguishment of debt	0	37,969,000	0
Decrease (increase) in:
Accounts receivable	(2,788,000)	(4,909,000)	(11,272,000)
Prepaid expenses and other current assets	(12,049,000)	717,000	(9,137,000)
Other assets	(3,260,000)	731,000	(3,191,000)
Increase (decrease) in:
Accounts payable and accrued expenses	5,831,000	(13,369,000)	3,674,000
Income taxes payable	(230,000)	(1,269,000)	(5,424,000)
Deferred revenue	(1,797,000)	(2,401,000)	1,080,000
Operating lease liabilities	(5,197,000)	(3,345,000)	(7,685,000)
Liability for uncertain tax positions	(1,730,000)	8,438,000	(453,000)
Other long-term liabilities	8,039,000	154,000	(2,614,000)
Net cash provided by operating activities	233,675,000	238,789,000	226,702,000
Cash flows from investing activities:
Purchases of property and equipment	(32,998,000)	(32,463,000)	(22,943,000)
Proceeds from sale of assets	0	507,000	0
Acquisition of businesses, net of cash received	(56,838,000)	(50,208,000)	(281,552,000)
Proceeds from sale of businesses, net of cash divested	48,876,000	24,353,000	0
Purchases of intangible assets	(1,511,000)	(3,110,000)	0
Net cash used in investing activities	(42,471,000)	(60,921,000)	(304,495,000)
Cash flows from financing activities:
Payment of debt	(593,000)	(650,000,000)	0
Debt extinguishment costs	0	(29,250,000)	0
Proceeds from line of credit	0	0	185,000,000
Repayment of line of credit	0	0	(185,000,000)
Issuance of long-term debt	305,000,000	0	0
Debt issuance costs	(10,849,000)	0	0
Issuance of common stock under employee stock purchase plan	519,000	0	0
Notes payable from related parties	0	(819,000)	(952,000)
Deferred payments for acquisitions	(6,267,000)	(6,571,000)	(750,000)
Contributions from Former Parent	21,238,000	508,938,000	64,922,000
Distribution to Former Parent - Separation	(290,282,000)	0	0
Distribution of non-fax cash to Former Parent	(266,539,000)	0	0
Other	0	(1,387,000)	(1,915,000)
Net cash (used in) provided by financing activities	(247,773,000)	(179,089,000)	61,305,000
Effect of exchange rate changes on cash and cash equivalents	(4,842,000)	6,635,000	2,253,000
Net change in cash and cash equivalents	(61,411,000)	5,414,000	(14,235,000)
Cash and cash equivalents at beginning of year	128,189,000	122,775,000	137,010,000
Cash and cash equivalents at end of year	66,778,000	128,189,000	122,775,000
Less cash and cash equivalents at end of year, discontinued operations	0	61,979,000	71,634,000
Cash and cash equivalents at end of year, continuing operations	$ 66,778,000	$ 66,210,000	$ 51,141,000