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Fair Value Measurements
12 Months Ended
Dec. 31, 2017
Fair Value Disclosures [Abstract]  
Fair Value Measurements
Fair Value Measurements
 
The carrying values of cash and cash equivalents, accounts receivable, accounts payable and accrued payroll and contractor professional pay approximate their fair value based on their short-term nature. Long-term debt recorded in the Company’s consolidated balance sheets at December 31, 2017 was $575.2 million (net of $12.8 million of unamortized deferred loan costs, see “Note 7. Long-Term Debt”). The fair value of the term B loan was determined using Level 1 inputs (quoted prices in active markets for identical liabilities) from the fair value hierarchy. The fair value of the term B loan was $591.7 million as of December 31, 2017.

Certain acquisitions included obligations to pay contingent consideration in cash if specific performance targets were met. There were no remaining contingent consideration obligations as of December 31, 2016. The following table summarizes the changes in the balance of contingent consideration for the year ended December 31, 2016 (in thousands):

Balance at beginning of year
 
$
(20,981
)
Additions for acquisitions
 

Payments on contingent consideration
 
21,594

Fair value adjustments
 
(613
)
Balance at end of year
 
$


 
Certain assets and liabilities, such as goodwill and trademarks, are not measured at fair value on an ongoing basis but are subject to fair value adjustments in certain circumstances (e.g., when there is evidence of impairment). For 2017 and 2016, no fair value adjustments were required for non-financial assets or liabilities.