Schedule II (Valuation and Qualifying Accounts) (Details) - USD ($)		12 Months Ended
		Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Doubtful Accounts
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at Beginning of Period		$ 18,377,000	$ 11,578,000	$ 6,233,000
Charged to Costs and Expenses		(6,022,000)	5,244,000	3,000,000
Deductions		0	0	0
Other*	[1]	112,000	1,555,000	2,345,000
Balance at End of Period		12,467,000	18,377,000	11,578,000
Deferred Tax Asset Valuation
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at Beginning of Period		1,971,000	1,828,000	1,537,000
Charged to Costs and Expenses		37,000	143,000	291,000
Deductions		0	0	0
Other		0	0	0
Balance at End of Period		$ 2,008,000	$ 1,971,000	$ 1,828,000

[1] Other represents doubtful account reserves released or recorded as part of net revenues for estimated customer disallowances.