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Financial Instruments (Tables)
 6 Months Ended
Jun. 30, 2018
Fair Value Disclosures [Abstract]  
Schedule of Carrying and Estimated Fair Value of Other Financial Instruments
The following table presents the carrying amounts and estimated fair values of our financial instruments by hierarchy level as of June 30, 2018 and December 31, 2017.

 
June 30, 2018
 
 
 
Hierarchy Level
 
Carrying
Amount
 
Level 1
 
Level 2
 
Level 3
Liabilities
 
 
 
 
 
 
 
Acquisition-related contingent consideration, including
current portion (1)
$
2,960

 
$
—

 
$
—

 
$
2,960

Long-term debt
375,000

 
—

 
381,750

 
—

Total
$
377,960

 
$
—

 
$
381,750

 
$
2,960

 
December 31, 2017
 
 
 
Hierarchy Level
 
Carrying
Amount
 
Level 1
 
Level 2
 
Level 3
Liabilities
 
 
 
 
 
 
 
Acquisition-related contingent consideration, including
current portion (1)
$
3,750

 
$
—

 
$
—

 
$
3,750

Long-term debt
400,000

 
—

 
409,000

 
—

Total
$
403,750

 
$
—

 
$
409,000

 
$
3,750

 
(1) 
The short-term portion is included in “Accounts payable, accrued expenses and other,” and the long-term portion is included in “Other liabilities” on the Condensed Consolidated Balance Sheets.