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Financial Instruments (Tables)
 12 Months Ended
Dec. 31, 2017
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 other financial instruments by hierarchy level as of December 31, 2017 and 2016.
 
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

 
December 31, 2016
 
 
 
Hierarchy Level
 
Carrying
Amount
 
Level 1
 
Level 2
 
Level 3
Liabilities
 
 
 
 
 
 
 
Acquisition-related contingent consideration, including
current portion (1)
$
5,692

 
$
—

 
$
—

 
$
5,692

Long-term debt
370,000

 
—

 
382,750

 
—

Total
$
375,692

 
$
—

 
$
382,750

 
$
5,692

 
(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 Consolidated Balance Sheets.