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Commitments and Contingencies - Letters of credit (Details) (Letter of Credit, USD $)
6 Months Ended
Jun. 30, 2014
Dec. 31, 2013
Jun. 30, 2014
Restricted cash and cash equivalents
Dec. 31, 2013
Restricted cash and cash equivalents
Jun. 30, 2014
BNP Paribas
Jun. 30, 2014
Citibank
Jun. 30, 2014
J.P. Morgan
Jul. 09, 2014
Subsequent Event [Member]
Citibank
Line of Credit Facility [Line Items]                
Facility $ 300,000,000       $ 100,000,000 $ 150,000,000 $ 50,000,000 $ 250,000,000
Notice period (Unused Facility Portion)         60 days 90 days 60 days  
Letters of credit outstanding 128,000,000 127,300,000            
Letters of credit outstanding as percentage of total facility 42.70% 42.40%            
Cash and cash equivalents pledged as security     $ 128,400,000 $ 100,600,000