Income Taxes (Narrative) (Details) - USD ($)	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Income Taxes [Line Items]
Income Tax Expense (Benefit), Continuing Operations, Adjustment of Deferred Tax (Asset) Liability		$ 17,200,000
State and local taxes, net of U.S. Federal tax	$ (331,000)	2,238,000	$ 15,366,000
Deferred state income tax asset	61,826,000	63,050,000
Deferred tax assets with respect to U.S. Federal income tax loss carryforwards	64,310,000	69,509,000
Deferred tax assets with respect to non U.S. income tax loss carryforwards	19,937,000	18,877,000
Valuation Allowance, Amount	62,816,000	57,603,000
Deferred income tax liabilities related to undistributed earnings of investments in non-U.S. subsidiaries	2,084,000	2,001,000
Income taxes receivable	9,313,000	32,744,000
Accounts payable and accrued liabilities	563,005,000	583,629,000
Interest accrued related to unrecognized tax benefits	300,000
Penalties accrued related to unrecognized tax benefits	0
State [Member]
Income Taxes [Line Items]
Income tax loss carryforwards to expire	1,049,700,000
Deferred state income tax asset	61,800,000
Valuation allowance related to operating loss carryforwards	41,600,000
Non-U.S.deferred tax asset related to capital loss carryforwards	36,000	107,000
Valuation Allowance, Amount	43,200,000
Unrecognized tax benefit that would impact the effective tax rate	2,000,000
State [Member] | Leaf Group [Member]
Income Taxes [Line Items]
Income tax loss carryforwards to expire		115,400,000
U.S. Federal [Member]
Income Taxes [Line Items]
Income tax loss carryforwards obtained as a result of prior stock acqusitions	306,200,000
Deferred tax assets with respect to U.S. Federal income tax loss carryforwards	64,300,000
Foreign tax credit carryforwards	1,300,000
Deferred tax assets with respect to U.S. Federal foreign tax credit carryforwards	1,271,000	970,000
Tax Credit Carryforward, Valuation Allowance	1,300,000
Unrecognized tax benefit that would impact the effective tax rate	1,900,000
Federal tax impact of unrecognized tax benefits that would impact the effective tax rate	400,000
U.S. Federal [Member] | Leaf Group [Member]
Income Taxes [Line Items]
Income tax loss carryforwards obtained as a result of prior stock acqusitions		262,500,000
non-U.S. [Member]
Income Taxes [Line Items]
Tax loss carryforwards as a result of operating losses and prior stock acquisitions	91,100,000
Deferred tax assets with respect to non U.S. income tax loss carryforwards	19,900,000
Valuation allowance against the deferred tax assets recorded for the tax losses carryforward	14,400,000
Tax loss carryforwards from operating losses and prior stock acquisitions that can be carried forward indefinitely	50,700,000
Non-U.S.deferred tax asset related to capital loss carryforwards	3,458,000	$ 3,707,000
Valuation Allowance, Amount	18,200,000
non-U.S. [Member] | Through 2027 [Member]
Income Taxes [Line Items]
Tax loss carryforwards subject to expiration	26,000,000
non-U.S. [Member] | After 2027 [Member]
Income Taxes [Line Items]
Tax loss carryforwards subject to expiration	14,400,000
Capital loss carryforward [Member] | non-U.S. [Member]
Income Taxes [Line Items]
Carryforward amount	11,500,000
Valuation Allowance, Amount	$ 3,500,000