Income Taxes (Effective Income Tax Rate Reconciliation) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Income Tax Contingency [Line Items]
Federal statutory provision	$ (85,366)	$ 8,375	$ (1,558)
State and local income taxes	(5,173)	(1,612)	(336)
Impact of foreign operations taxed at rates other than the U.S. statutory rate	2,646	3,349	(2,220)
Accrual/release of uncertain tax amounts related to foreign operations	(2,829)	(2,753)	(7,288)
U.S. tax impacts of foreign income in the U.S.	1,099	1,089	4,441
CARES Act carryback benefit	0	0	(2,270)
Tax credits	(1,683)	(850)	(500)
Unrealized stock compensation benefits	574	572	(505)
Goodwill impairment	68,557	0	0
Borderfree tax basis differences	0	(5,610)	0
Other, net	1,300	380	(686)
(Benefit) provision for income taxes	(20,875)	2,940	(10,922)
Tax resolution, benefit		1,000
Tax return true-up, benefit		1,000
Deferred rate charge (benefit)		2,000	(5,000)
Valuation allowance, charge		1,000
Sale of business, charge (benefit)		(5,000)	6,000
Officer compensation, charge	$ 1,000
Reorganization, benefit			3,000
Disposal Group, Disposed of by Sale, Not Discontinued Operations
Income Tax Contingency [Line Items]
Sale of business, charge (benefit)		$ (1,000)	$ 3,000