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Income Taxes	6 Months Ended
	Jun. 30, 2018
Income Tax Disclosure [Abstract]
Income Taxes	(8) Income Taxes The Company’s effective tax rate was approximately 52% and 28% for the three months ended June 30, 2017 and 2018, respectively, and approximately 25% and 57% for the six months ended June 30, 2017 and 2018, respectively. These rates differ from the federal statutory rate of 35% and 21% in 2017 and 2018, respectively, due to the effect of state income taxes and certain expenses that are not deductible for tax purposes. The effective tax rate for the six months ended June 30, 2018 also reflects a $1.2 million increase due to the change in fair value of contingent consideration during that time period. The effective tax rate for the three and six months ended June 30, 2017 also reflects a $0.9 million increase and a $2.0 million decrease due to the change in fair value of contingent consideration during the three and six months ended June 30, 2017, respectively.

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- Definition

The entire disclosure for income taxes. Disclosures may include net deferred tax liability or asset recognized in an enterprise's statement of financial position, net change during the year in the total valuation allowance, approximate tax effect of each type of temporary difference and carryforward that gives rise to a significant portion of deferred tax liabilities and deferred tax assets, utilization of a tax carryback, and tax uncertainties information.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-URI http://asc.fasb.org/topic&trid=2144680

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