Income Taxes, Deferred Tax Asset Valuation Adjustments (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2021		Dec. 31, 2020		Dec. 31, 2019
Valuation Allowance [Roll Forward]
Recognition of valuation allowance on foreign tax credit carryforwards		$ 11,900				$ 9,800
Deferred Tax Asset Valuation Allowance [Member]
Valuation Allowance [Roll Forward]
Beginning balance		67,340		$ 77,042		68,697
Additions charged to cost and expenses		12,674	[1]	2,154	[2]	10,913	[3]
Decreases		0	[4]	(12,100)	[5]	(3,343)	[6]
Adjustments	[7]	172		244		775
Ending balance		$ 80,186		$ 67,340		$ 77,042

[1] Increase in valuation is due primarily to $11.9 million that was recorded on the foreign tax credit carryforward due to the disposal of the Companies Grow Tech segment. The additional amount is due to net operating losses in foreign markets.

[2] Increase in valuation is due primarily to net operating losses in foreign markets. 

[3] Increase in valuation is due primarily to $9.8 million that was recorded on the foreign tax credit carryforward. The additional amount is due to net operating losses in foreign markets. 

[4] No decreases in 2021.

[5] The decrease was due to the utilization of prior year foreign tax credits that had previously had a valuation allowance recorded against the asset.

[6] The decrease was due primarily to the utilization of foreign tax credits, and expiration of foreign net operating losses.

[7] Represents the net currency effects of translating valuation allowances at current rates of exchange.