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Financial Instruments
6 Months Ended
Jun. 30, 2018
Fair Value Disclosures [Abstract]  
Financial Instruments
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.  
The fair values of financial instruments not included in this table are estimated to be equal to their carrying values as of June 30, 2018 and December 31, 2017.
We determine the fair value of our long-term debt primarily based on quoted market prices for our 6% senior notes due 2022 (the “2022 Notes”) as of June 30, 2018 and December 31, 2017. The fair value of our borrowings on our senior secured bank revolving credit facility (“Credit Facility”) approximates the carrying amount. The fair value of our long-term debt is classified within Level 2 of the fair value hierarchy because it is traded in less active markets.
We estimate the fair value of acquisition-related contingent consideration using a probability-weighted discounted cash flow model. This fair value estimate represents a Level 3 measurement as it is based on significant inputs not observed in the market and reflect our own assumptions. The significant unobservable inputs used in the fair value measurements of our acquisition-related contingent consideration are our measures of the future profitability and related cash flows and discount rates. The fair value of the contingent consideration is reassessed at each reporting period by the Company based on additional information as it becomes available.
Any change in the fair value of an acquisition’s contingent consideration liability results in a remeasurement gain or loss that is recorded in “Selling, general and administrative expenses” on the Condensed Consolidated Statements of Comprehensive Income. During the six months ended June 30, 2018 there was no change in the estimated fair value of future expected contingent consideration payments. During the six months ended June 30, 2017, we recorded a remeasurement loss of $0.7 million.