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Income Taxes (Federal Tax Rate Reconciliation) (Details)
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Income Tax Disclosure [Abstract]      
Federal statutory rate 21.00% 35.00% 35.00%
State income taxes, net 14.10% (2.80%) 2.90%
Foreign tax rate differential 12.10% (10.00%) (3.30%)
Permanent differences 8.30% (8.90%) 6.90%
Valuation allowance (17.50%) (48.60%) (13.00%)
Benefit from intraperiod tax allocation under ASC 740 0.00% 73.50% 0.00%
Net change in unrecognized tax benefits (0.90%) 0.50% (10.20%)
Other, net (primarily prior year return to provision) (1.60%) 1.60% (5.70%)
Effective tax rate 35.50% 40.30% 12.60%