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Derivative Instruments and Hedging Activities (Tables)
 9 Months Ended
Sep. 30, 2017
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 September 30, 2017 and December 31, 2016 (in thousands):
 
 
Notional Amount
 
Fair Value at September 30, 2017 (USD)
 
Fair Value at December 31, 2016 (USD)
 
 
September 30, 2017
 
December 31, 2016
 
Other Assets
 
Other Noncurrent Liabilities
 
Other Assets
 
Other Noncurrent Liabilities
Interest rate swap agreements
 
 
 
 
 
 
 
 
USD denominated
 
$
590,000

 
$
590,000

 
$
15,054

 
$
—

 
$
16,421

 
$
—

Cross currency swap agreements
 
 
 
 
 
 
 
 
USD/euro
 
$
410,511

 
$
422,408

 
2,184

 
52,068

 
1,486

 
3,128

 Total cash flow hedges
 
$
17,238

 
$
52,068

 
$
17,907

 
$
3,128