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Fair Value of Financial Instruments (Tables)
6 Months Ended
Jun. 30, 2015
Fair Value Disclosures [Abstract]  
Fair value of certain financial assets and liabilities and other financial instruments
The fair value of certain financial assets and liabilities and other financial instruments as of June 30, 2015 and December 31, 2014, in thousands, is as follows:
 
June 30, 2015
 
December 31, 2014
 
Carrying
Amount
 
Fair Value
 
Carrying
Amount
 
Fair Value
Debt
$
1,097,326

 
$
1,022,723

 
$
1,038,330

 
$
1,059,988