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Income Taxes - Income Tax Rate Reconciliation (Details)
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Reconciliation of federal statutory tax rate with effective tax rate      
Federal statutory tax rate 21.00% 21.00% 35.00%
Impact of one-time deemed repatriation 0.00% 6.20% 11.30%
Impact on deferred taxes for changes in tax rates 20.50% (3.30%) (188.50%)
Additional deferred tax adjustments 0.00% (1.50%) 0.00%
State income taxes, net of federal income tax benefit (19.20%) 3.70% 3.30%
Foreign rates varying from federal statutory tax rate 3.10% 0.10% (4.20%)
Tax contingencies 15.70% (0.90%) 0.10%
Tax credits 11.30% 0.20% (0.10%)
Other permanent book-tax differences (8.60%) 0.80% 0.20%
Other, net 1.10% 0.00% 0.00%
Effective tax rate 44.90% 26.30% (142.90%)