Annual report pursuant to Section 13 and 15(d)

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Schedule of receivables and other assets (Details 7)

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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Schedule of receivables and other assets (Details 7) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Accounting Policies [Abstract]    
Accounts receivable, net $ 7,369us-gaap_AccountsReceivableNet $ 8,230us-gaap_AccountsReceivableNet
Derivative assets   43,662us-gaap_DerivativeAssets
Prepaid expenses 6,639us-gaap_PrepaidExpenseCurrentAndNoncurrent 5,937us-gaap_PrepaidExpenseCurrentAndNoncurrent
Interest receivable 2,324us-gaap_InterestReceivable 4,667us-gaap_InterestReceivable
Deposits 7,339us-gaap_DepositAssets 8,537us-gaap_DepositAssets
Inventory 4,964us-gaap_InventoryNet 4,891us-gaap_InventoryNet
Miscellaneous assets, net 6,939us-gaap_OtherAssetsMiscellaneous 8,242us-gaap_OtherAssetsMiscellaneous
Receivables and other assets $ 35,574us-gaap_OtherAssets $ 84,166us-gaap_OtherAssets