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Derivative Instruments (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Derivative [Line Items]    
Total outstanding derivative contracts $ 381,393 $ 390,924
Outstanding derivative contracts maturity, maximum 1 year 3 months 0 days  
Cash Flow Hedges [Member]
   
Derivative [Line Items]    
Total outstanding derivative contracts 208,446 165,000
Balance Sheet Hedges [Member]
   
Derivative [Line Items]    
Total outstanding derivative contracts $ 172,947 $ 225,924