Income Taxes (Narrative) (Details) - USD ($)	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
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	2,238,000	$ 15,366,000	$ (4,064,000)
Deferred state income tax asset	63,050,000	53,499,000
Deferred tax assets with respect to U.S. Federal income tax loss carryforwards	69,509,000	18,272,000
Deferred tax assets with respect to non U.S. income tax loss carryforwards	18,877,000	15,802,000
Valuation Allowance, Amount	57,603,000	47,217,000
Deferred income tax liabilities related to undistributed earnings of investments in non-U.S. subsidiaries	2,001,000	1,866,000
Income taxes receivable	32,744,000	29,313,000
Accounts payable and accrued liabilities	583,629,000	520,236,000
Interest accrued related to unrecognized tax benefits	0
Penalties accrued related to unrecognized tax benefits	0
Cable ONE [Member]
Income Taxes [Line Items]
Income taxes receivable	15,900,000
Accounts payable and accrued liabilities	15,900,000
State [Member]
Income Taxes [Line Items]
Income tax loss carryforwards to expire	1,026,100,000
Deferred state income tax asset	63,100,000
Valuation allowance related to operating loss carryforwards	35,400,000
Non-U.S.deferred tax asset related to capital loss carryforwards	107,000	289,000
Valuation Allowance, Amount	37,500,000
Unrecognized tax benefit that would impact the effective tax rate	1,300,000
State [Member] | Leaf Group [Member]
Income Taxes [Line Items]
Income tax loss carryforwards to expire	115,400,000
State [Member] | Graham Healthcare Group [Member]
Income Taxes [Line Items]
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount	1,800,000
U.S. Federal [Member]
Income Taxes [Line Items]
Income tax loss carryforwards obtained as a result of prior stock acqusitions	331,000,000
Deferred tax assets with respect to U.S. Federal income tax loss carryforwards	69,500,000
Foreign tax credit carryforwards	1,000,000
Deferred tax assets with respect to U.S. Federal foreign tax credit carryforwards	970,000	992,000
Tax Credit Carryforward, Valuation Allowance	1,000,000
Unrecognized tax benefit that would impact the effective tax rate	1,800,000
Federal tax impact of unrecognized tax benefits that would impact the effective tax rate	300,000
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	87,100,000
Deferred tax assets with respect to non U.S. income tax loss carryforwards	18,900,000
Valuation allowance against the deferred tax assets recorded for the tax losses carryforward	14,900,000
Tax loss carryforwards from operating losses and prior stock acquisitions that can be carried forward indefinitely	44,200,000
Non-U.S.deferred tax asset related to capital loss carryforwards	3,707,000	$ 3,925,000
Valuation Allowance, Amount	19,100,000
non-U.S. [Member] | Through 2026 [Member]
Income Taxes [Line Items]
Tax loss carryforwards subject to expiration	12,200,000
non-U.S. [Member] | After 2026 [Member]
Income Taxes [Line Items]
Tax loss carryforwards subject to expiration	30,700,000
Capital loss carryforward [Member] | non-U.S. [Member]
Income Taxes [Line Items]
Carryforward amount	12,400,000
Valuation Allowance, Amount	$ 3,700,000