Quarterly report pursuant to Section 13 or 15(d)

Basis of Presentation and Significant Accounting Policies Offsetting Assets and Liabilities (Details)

v3.4.0.3
Basis of Presentation and Significant Accounting Policies Offsetting Assets and Liabilities (Details) - USD ($)
$ in Thousands
Mar. 31, 2016
Dec. 31, 2015
Derivative Financial Instruments, Assets [Member]    
Offsetting Assets and Liabilities [Line Items]    
Gross Amount of Recognized Assets (Liabilities) $ 311,134 $ 325,755
Gross Amounts Offset on the Balance Sheet (113,287) (54,246)
Net Amount of Assets (Liabilities) Presented on the Balance Sheet 197,847 271,509
Gross Amounts of Financial Instruments Not Offset on the Balance Sheet (77,038) (7,285)
Gross Amounts of Cash Collateral Not Offset on the Balance Sheet 0 0
Net Amount After Deducting Gross Amounts Not Offset on the Balance Sheet From Net Amount of Assets (Liabilities) Presented on the Balance Sheet 120,809 264,224
Assets [Member]    
Offsetting Assets and Liabilities [Line Items]    
Gross Amount of Recognized Assets (Liabilities) 311,134 325,755
Gross Amounts Offset on the Balance Sheet (113,287) (54,246)
Net Amount of Assets (Liabilities) Presented on the Balance Sheet 197,847 271,509
Gross Amounts of Financial Instruments Not Offset on the Balance Sheet (77,038) (7,285)
Gross Amounts of Cash Collateral Not Offset on the Balance Sheet 0 0
Net Amount After Deducting Gross Amounts Not Offset on the Balance Sheet From Net Amount of Assets (Liabilities) Presented on the Balance Sheet 120,809 264,224
Securities Loaned or Sold under Agreements to Repurchase [Member]    
Offsetting Assets and Liabilities [Line Items]    
Gross Amount of Recognized Assets (Liabilities) (6,189,852) (5,008,274)
Gross Amounts Offset on the Balance Sheet 0 0
Net Amount of Assets (Liabilities) Presented on the Balance Sheet (6,189,852) (5,008,274)
Gross Amounts of Financial Instruments Not Offset on the Balance Sheet 6,189,852 5,008,274
Gross Amounts of Cash Collateral Not Offset on the Balance Sheet 0 0
Net Amount After Deducting Gross Amounts Not Offset on the Balance Sheet From Net Amount of Assets (Liabilities) Presented on the Balance Sheet 0 0
Derivative Financial Instruments, Liabilities [Member]    
Offsetting Assets and Liabilities [Line Items]    
Gross Amount of Recognized Assets (Liabilities) (190,325) (61,531)
Gross Amounts Offset on the Balance Sheet 113,287 54,246
Net Amount of Assets (Liabilities) Presented on the Balance Sheet (77,038) (7,285)
Gross Amounts of Financial Instruments Not Offset on the Balance Sheet 77,038 7,285
Gross Amounts of Cash Collateral Not Offset on the Balance Sheet 0 0
Net Amount After Deducting Gross Amounts Not Offset on the Balance Sheet From Net Amount of Assets (Liabilities) Presented on the Balance Sheet 0 0
Liability [Member]    
Offsetting Assets and Liabilities [Line Items]    
Gross Amount of Recognized Assets (Liabilities) (6,380,177) (5,069,805)
Gross Amounts Offset on the Balance Sheet 113,287 54,246
Net Amount of Assets (Liabilities) Presented on the Balance Sheet (6,266,890) (5,015,559)
Gross Amounts of Financial Instruments Not Offset on the Balance Sheet 6,266,890 5,015,559
Gross Amounts of Cash Collateral Not Offset on the Balance Sheet 0 0
Net Amount After Deducting Gross Amounts Not Offset on the Balance Sheet From Net Amount of Assets (Liabilities) Presented on the Balance Sheet $ 0 $ 0