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Income Taxes
3 Months Ended
Mar. 31, 2019
Income Tax Disclosure [Abstract]  
Income Taxes
(10)
Income Taxes
 
The Company’s effective tax rate was (13.7)% and 31.9% for the three months ended March 31, 2018 and 2019, respectively. These rates differ from the federal statutory rate of 21% due to the effect of state income taxes and certain expenses that are not deductible for tax purposes. The effective tax rate for the three months ended March 31, 2018 also reflects a $1.2 million increase due to the change in fair value of contingent consideration during that time period.