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Derivative financial instruments (Tables)
 6 Months Ended
Jun. 30, 2014
Derivative Instruments and Hedging Activities Disclosure [Abstract]  
Interest rate swaps
Information regarding interest rate swaps as of June 30, 2014 was as follows:
 
 
Notional amount
 
Fair value of interest rate swaps
 
Increase (decrease) in debt due to fair value adjustment
 
Balance sheet caption including interest rate swaps
Fair value hedge related to long-term debt due in 2014
 
$
198,000

 
$
1,234

 
$
538

 
Other current assets
Fair value hedge related to long-term debt due in 2020
 
200,000

 
(10,377
)
 
(10,377
)
 
Other non-current liabilities
Total fair value hedges
 
$
398,000

 
$
(9,143
)

$
(9,839
)
 
 

Information regarding interest rate swaps as of December 31, 2013 was as follows:
 
 
Notional amount
 
Fair value of interest rate swaps
 
Increase (decrease) in debt due to fair value adjustment
 
Balance sheet caption including interest rate swaps
Fair value hedge related to long-term debt due in 2014
 
$
198,000

 
$
2,158

 
$
1,569

 
Other current assets
Fair value hedge related to long-term debt due in 2020
 
200,000

 
(16,239
)
 
(16,239
)
 
Other non-current liabilities
Total fair value hedges
 
$
398,000

 
$
(14,081
)
 
$
(14,670
)