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Fair Value Measurements
6 Months Ended
Jun. 30, 2018
Fair Value Disclosures [Abstract]  
Fair Value Measurements
Fair Value Measurements

Fair Value Disclosures for Financial Assets and Liabilities
We determined the carrying value of cash equivalents, accounts receivable, trade payables, accrued liabilities and short-term borrowings approximate their fair values because of the nature of their terms and current market rates of these instruments. We believe the carrying value of our variable rate debt approximates fair value.
 
We have fixed rate debt primarily consisting of amounts outstanding under our senior notes and real estate mortgages. We calculated the estimated fair value of the senior notes using quoted prices for the identical liability (Level 1) and calculated the estimated fair value of the fixed rate real estate mortgages using a discounted cash flow methodology with estimated current interest rates based on a similar risk profile and duration (Level 2). The fixed cash flows are discounted and summed to compute the fair value of the debt. As of June 30, 2018, our real estate mortgages and other debt, which includes capital leases, had maturity dates between September 27, 2019 and December 31, 2050.

There were no changes to our valuation techniques during the six-month period ended June 30, 2018.

A summary of the aggregate carrying values, excluding unamortized debt issuance cost, and fair values of our long-term fixed interest rate debt is as follows (in thousands):
 
 
June 30, 2018
 
December 31, 2017
Carrying value
 
 
 
 
5.25% Senior Notes due 2025
 
$
300,000

 
$
300,000

Real Estate Mortgages and Other Debt
 
451,950

 
376,880

 
 
$
751,950


$
676,880

Fair value
 
 
 
 
5.25% Senior Notes due 2025
 
$
291,750

 
$
312,750

Real Estate Mortgages and Other Debt
 
450,686

 
385,337

 
 
$
742,436

 
$
698,087