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Income Taxes	3 Months Ended
	Mar. 31, 2018
Income Tax Disclosure [Abstract]
Income Taxes	(8) Income Taxes The Company’s effective tax rate was approximately (5.9)% and (13.7)% for the three months ended March 31, 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 three months ended March 31, 2018 also reflects a $1.2 million increase due to the change in fair value of contingent consideration. The effective tax rate for the three months ended March 31, 2017 also reflects a $3.0 million decrease due to the change in fair value of contingent consideration.

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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://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-URI http://asc.fasb.org/topic&trid=2144680

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