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Fair Value Measurements (Tables)
 12 Months Ended
Dec. 31, 2017
Fair Value Disclosures [Abstract]  
Summary of Estimated Fair Values of Financial Assets and Liabilities Measured on a Recurring Basis
The table which follows summarizes the estimated fair value of the Company’s financial assets and liabilities measured on a recurring basis:

Fair Value Measurements
 
December 31, 2017
 
December 31, 2016
Financial Liabilities:
(amounts in thousands)
(Level 1)
 
 
 
Deferred compensation
$
1,467

 
$
1,472

(Level 3)
 

 
 

Convertible Notes derivative liability
$
—

 
$
27,532

Contingent purchase price liabilities
$
5,368

 
$
5,603
Fair Value, Liabilities Measured on recurring Basis, Unobservable Input Reconciliation
The table which follows reconciles the opening balances to the closing balances for fair value measurements categorized within Level 3 of the fair value hierarchy:
 
Contingent Purchase
 
Convertible Notes
 
Price Liabilities (a)
 
Derivative Liability
 
(amounts in thousands)
 
 
 
 
December 31, 2015
$
3,686

 
$
33,337

Additions
1,300

 
—

Payments
(152
)
 
—

Accretion expense
887

 
—

Valuation gain for the period
(118
)
 
(5,805
)
December 31, 2016
5,603

 
27,532

Payments/Settlements
(280
)
 
(25,951
)
Accretion expense
967

 
—

Valuation gain for the period
(922
)
 
(1,581
)
December 31, 2017
$
5,368

 
$
—

_______________

(a) Related to the Mediscan acquisition on October 30, 2015 and the USR acquisition on December 1, 2016. See Note 3 - Acquisitions. Valuation gain and accretion expense is included as acquisition-related contingent consideration on the consolidated statements of operations.
Carrying Amounts and Estimated Fair Values of Significant Financial Instrument that were not Measured at Fair Value
The following table represents the carrying amounts and estimated fair value of the Company’s significant financial instruments that were not measured at fair value:
 
December 31, 2017
 
December 31, 2016
Carrying
Amount
 
Fair
Value
 
Carrying
Amount
 
Fair
Value
 
(amounts in thousands)
Financial Liabilities:
 
 
 
 
 
 
 
(Level 2)
 

 
 

 
 

 
 

Term Loan, net
$
99,134

 
$
100,500

 
$
39,137

 
$
41,500

Convertible Notes, net
$
—

 
$
—

 
$
20,331

 
$
27,250