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Fair Value (Tables)
 12 Months Ended
Dec. 31, 2015
Fair Value Disclosures [Abstract]  
Carrying value and fair value of variable rate long-term debt
The following table reflects the carrying value and fair value of our variable-rate long-term debt (in thousands):
 
 
As of December 31,
 
 
2015
 
2014
 
 
Carrying
Value
 
Fair
Value
 
Carrying
Value
 
Fair
Value
Variable-rate long-term debt
 
$
817,000

 
$
817,000

 
$
735,000

 
$
735,000