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Income Taxes - Effective Income Tax Rate Reconciliation (Details)
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Effective Income Tax Rate Reconciliation    
Tax at federal statutory rate (as a percent) 21.00% 35.00%
State income taxes (as a percent) 4.00% 0.50%
Foreign taxes (as a percent) (0.10%) (0.10%)
Deferred tax impact of enacted tax rate and law changes (as a percent) (0.70%) 18.40%
Goodwill impairments (as a percent)   (17.40%)
Tax benefit for U.K. sale 0.175  
Valuation allowance (as a percent) (13.50%) (1.50%)
Unrecognized tax benefits (as a percent) (4.80%) (3.20%)
Tax credits (as a percent) 2.50% 10.80%
Other (as a percent) (3.20%) (0.80%)
Effective income tax rate (as a percent) 22.70% 41.70%