Note 9. Income Taxes Effective Tax Rate Reconciliation (Details)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Income Tax Disclosure [Abstract]
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent	21.00%	21.00%	21.00%	35.00%
Effective Income Tax Rate Reconciliation, Prior Year Income Taxes, Percent	36.50%	0.00%	0.00%
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Impairment Losses, Percent	(3.50%)	0.00%	0.00%
Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Percent	1.10%	2.20%	2.30%
Effective Income Tax Rate Reconciliation, Tax Credit, Foreign, Percent	(0.20%)	1.20%	2.90%
Effective Tax Rate Reconciliation, Executive Compensation Limitations	(0.30%)	1.20%	0.90%
Effective Tax Rate Reconciliation, Interest Expense Limitations	0.20%	1.00%	1.30%
Effective Income Tax Rate Reconciliation, Noncontrolling Interest Income (Loss), Percent	0.10%	0.10%	(0.50%)
Effective Tax Rate Reconciliation, Changes in Laws and Apportionment	(1.20%)	4.30%	5.20%
Effective Income Tax Rate Reconciliation, Change in Deferred Tax Assets Valuation Allowance, Percent	0.50%	0.00%	1.60%
Effective Income Tax Rate Reconciliation, Tax Expense (Benefit), Share-based Payment Arrangement, Percent	0.00%	(0.80%)	(1.40%)
Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Percent	0.00%	0.00%	(3.90%)
Effective Income Tax Rate Reconciliation, Other Adjustments, Percent	0.10%	0.40%	(1.30%)
Effective Income Tax Rate Reconciliation, Percent	54.30%	30.60%	28.10%