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Fair Value Measurements
6 Months Ended
Jun. 30, 2017
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 and calculate the estimated fair value of our fixed rate debt using a discounted cash flow methodology. Using 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, 2017, this debt had maturity dates between December 31, 2017 and December 31, 2050. There were no changes to our valuation techniques during the six-month period ended June 30, 2017.

A summary of the aggregate carrying values and fair values of our long-term fixed interest rate debt is as follows (in thousands):
 
 
June 30, 2017
 
December 31, 2016
Carrying value
 
$
370,768

 
$
286,660

Fair value
 
368,142

 
293,522