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Fair Value of Financial Instruments (Tables)
12 Months Ended
Dec. 31, 2012
Fair Value Disclosures [Abstract]  
Carrying value and fair value of variable rate long-term debt
 
 
As of December 31,
 
 
2012
 
2011
 
 
Carrying
Value
 
Fair
Value
 
Carrying
Value
 
Fair
Value
Variable-rate long-term debt
 
$
592,422

 
$
592,422

 
$
573,984

 
$
573,984