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Commitments and Contingencies - Letters of credit (Details) (USD $)
9 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2014
Letter of Credit
Dec. 31, 2013
Letter of Credit
Sep. 30, 2014
Letter of Credit
Restricted cash and cash equivalents
Dec. 31, 2013
Letter of Credit
Restricted cash and cash equivalents
Sep. 30, 2014
Letter of Credit
BNP Paribas
Sep. 30, 2014
Letter of Credit
Citibank
Jul. 09, 2014
Letter of Credit
Citibank
Jul. 08, 2014
Letter of Credit
Citibank
Sep. 30, 2014
Letter of Credit
J.P. Morgan
Line of Credit Facility [Line Items]                    
Facility   $ 400,000,000       $ 100,000,000 $ 250,000,000 $ 250,000,000 $ 150,000,000 $ 50,000,000
Notice period (Unused Facility Portion)           60 days 90 days     60 days
Letters of credit outstanding   160,100,000 127,300,000              
Letters of credit outstanding as percentage of total facility   40.00% 42.40%              
Cash and cash equivalents pledged as security       160,600,000 100,600,000          
Unfunded capital commitment $ 5,500,000