Annual report pursuant to Section 13 and 15(d)

Restricted Cash (Details)

v3.3.1.900
Restricted Cash (Details) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Restricted Cash and Cash Equivalents Items [Line Items]    
Restricted cash $ 262,562 $ 336,771
Restricted Cash and Cash Equivalents Held for Securities Trading Activity [Member]    
Restricted Cash and Cash Equivalents Items [Line Items]    
Restricted cash 12,550 12,000
Restricted Cash and Cash Equivalents Held for Derivatives Trading Activity [Member]    
Restricted Cash and Cash Equivalents Items [Line Items]    
Restricted cash 130,355 211,989
Restricted Cash and Cash Equivalents Pledged as Restricted Collateral for Borrowings [Member]    
Restricted Cash and Cash Equivalents Items [Line Items]    
Restricted cash 119,310 112,435
Restricted Cash and Cash Equivalents Held by Counterparties [Member]    
Restricted Cash and Cash Equivalents Items [Line Items]    
Restricted cash 262,215 336,424
Restricted Cash and Cash Equivalents for Lease [Member]    
Restricted Cash and Cash Equivalents Items [Line Items]    
Restricted cash $ 347 $ 347