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Accounting for Derivatives (Tables)
 9 Months Ended
Sep. 30, 2015
Derivative Instruments and Hedging Activities Disclosure [Abstract]  
Effect of derivative instruments on consolidated financial position
 
September 30, 2015
 
Balance Sheet Location
Fair Value
Asset (Liability)
Derivatives designated as hedging instruments:
 
 

Interest rate swaps
Accrued liabilities
$
(5,976
)
Interest rate swaps
Other long-term liabilities
(5,012
)
Total derivatives
 
$
(10,988
)

 
December 31, 2014
 
Balance Sheet Location
Fair Value
Asset (Liability)
Derivatives designated as hedging instruments:
 
 

Interest rate swaps
Intangible and other assets, net
$
712

Interest rate swaps
Accrued liabilities
(4,958
)
Interest rate swaps
Other long-term liabilities
(150
)
Total derivatives
 
$
(4,396
)
Effect of derivative instruments on results of operations
 
Pre-tax Gain (Loss)
Recognized in Other
Comprehensive
Income (Loss) on
Derivatives
 
Location of Pre-tax
Gain (Loss)
Reclassified from
Accumulated Other
Comprehensive
Income (Loss) into
Income (Loss)
 
Pre-tax Gain (Loss)
Reclassified from
Accumulated Other
Comprehensive
Income (Loss) into
Income (Loss)
Derivatives designated as cash flow hedges:
 

 
 
 
 

Interest rate swaps
 

 
 
 
 

Three months ended September 30, 2015
$
(6,100
)
 
Interest expense
 
$
(2,006
)
Three months ended September 30, 2014
846

 
Interest expense
 
(1,414
)
Nine months ended September 30, 2015
(12,098
)
 
Interest expense
 
(5,697
)
Nine months ended September 30, 2014
(2,283
)
 
Interest expense
 
(3,917
)