Offsetting Assets and Liabilities (Details) $ in Thousands	12 Months Ended
Dec. 31, 2017 USD ($) counterparty	Dec. 31, 2016 USD ($)
Derivative hedging instruments, at fair value
Gross Amounts of Recognized Assets	$ 679	$ 233
Gross Amounts Offset in the Consolidated Balance Sheets	0	0
Net Amounts of Assets Presented in the Consolidated Balance Sheets	679	233
Gross Amounts Not Offset in the Consolidated Balance Sheets
Financial Instruments	(679)	(233)
Cash Collateral Received	0	0
Net Amount	0	0
Swaps, at fair value
Gross Amounts of Recognized Liabilities	0	46,954
Gross Amounts Offset in the Consolidated Balance Sheets	0	0
Net Amounts of Liabilities Presented in the Consolidated Balance Sheets	0	46,954
Gross Amounts Not Offset in the Consolidated Balance Sheets
Financial Instruments	0	0
Cash Collateral Pledged	0	(46,954)
Net Amount	0	0
Repurchase agreements and other advances
Gross Amounts of Recognized Liabilities	6,614,907	8,687,478
Gross Amounts Offset in the Consolidated Balance Sheets	0	0
Net Amounts of Liabilities Presented in the Consolidated Balance Sheets	6,614,907	8,687,478
Gross Amounts Not Offset in the Consolidated Balance Sheets
Financial Instruments	(6,608,005)	(8,682,864)
Cash Collateral Pledged	(6,902)	(4,614)
Net Amount	0	0
Total
Gross Amounts of Recognized Liabilities	6,614,907	8,734,432
Gross Amounts Offset in the Consolidated Balance Sheets	0	0
Net Amounts of Liabilities Presented in the Consolidated Balance Sheets	6,614,907	8,734,432
Gross Amounts Not Offset in the Consolidated Balance Sheets
Financial Instruments	(6,608,005)	(8,682,864)
Cash Collateral Pledged	(6,902)	(51,568)
Net Amount	0	0
Additional disclosures
Derivatives, excess collateral	6,400	6,900
Fair value of securities pledged against the swaps	21,800	32,500
Fair value of securities pledged against the repurchase agreements	8,100,000	10,500,000
Unamortized debt issuance expense	$ 206	210
Number of repurchase agreement counterparties with unconditional right of setoff \| counterparty	1
Swaps
Derivative hedging instruments, at fair value
Gross Amounts of Recognized Assets	$ 679	233
Gross Amounts Offset in the Consolidated Balance Sheets	0	0
Net Amounts of Assets Presented in the Consolidated Balance Sheets	679	233
Gross Amounts Not Offset in the Consolidated Balance Sheets
Financial Instruments	(679)	(233)
Cash Collateral Received	0	0
Net Amount	$ 0	$ 0

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- Definition

The remaining balance of debt issuance expenses that were capitalized and are being amortized against income over the lives of the respective bond issues. This does not include the amounts capitalized as part of the cost of the utility plant or asset.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.17)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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