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Derivative Instruments and Hedging Activities (Tables)
 12 Months Ended
Dec. 31, 2015
Derivative Instruments and Hedging Activities Disclosure [Abstract]  
Schedule of Cash Flow Hedges
The following table summarizes the notional amounts and fair values of our designated cash flow hedges as of December 31, 2015 and 2014 (in thousands):
 
 
Notional Amount
 
Fair Value at December 31, 2015 (USD)
 
Fair Value at December 31, 2014 (USD)
 
 
December 31, 2015
 
December 31, 2014
 
Other Accrued Expenses
 
Other Noncurrent Liabilities
 
Other Accrued Expenses
 
Other Noncurrent Liabilities
Interest rate swap agreements
 
 
 
 
 
 
 
 
USD denominated
 
$
170,000

 
$
420,000

 
$
858

 
$
—

 
$
2,691

 
$
1,615

GBP denominated
 
£
50,000

 
£
50,000

 
465

 
—

 
—

 
893

CAD denominated
 
C$
25,000

 
C$
25,000

 
24

 
—

 
—

 
19

Total cash flow hedges
 
$
1,347


$
—

 
$
2,691

 
$
2,527