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Borrowings (Repurchase Agreements) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Dec. 31, 2015
Debt Instrument [Line Items]
Borrowing Balance	$ 1,072,716	$ 1,371,534
Securities Sold under Agreements to Repurchase [Member]
Debt Instrument [Line Items]
Borrowing Balance	$ 634,500	$ 932,500
Weighted Average Coupon	2.67%
Securities Sold under Agreements to Repurchase [Member] | Due date: 12 8 2016 [Member]
Debt Instrument [Line Items]
Borrowing Balance	$ 170,000
Weighted Average Coupon	1.50%
Settlement Date	Dec. 06, 2012
Investment Repurchase Agreement, Repurchase Date	Dec. 08, 2016
Securities Sold under Agreements to Repurchase [Member] | Due date: 3 2 2016 [Member]
Debt Instrument [Line Items]
Borrowing Balance	$ 232,000
Weighted Average Coupon	4.78%
Settlement Date	Mar. 02, 2007
Investment Repurchase Agreement, Repurchase Date	Mar. 02, 2017
Securities Sold under Agreements to Repurchase [Member] | Due date: 4 29 2018 [Member]
Debt Instrument [Line Items]
Borrowing Balance	$ 232,500
Weighted Average Coupon	1.42%
Settlement Date	Dec. 10, 2012
Investment Repurchase Agreement, Repurchase Date	Apr. 29, 2018

X

- Definition

Date the repurchase agreement was made.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Article 12
-Section 12
-Footnote 2

+ Details

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- Definition

Date the repurchase will be made.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Article 12
-Section 12
-Footnote 2

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- Definition

Sum of the carrying values as of the balance sheet date of all debt, including all short-term borrowings, long-term debt, and capital lease obligations.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03.13,16)
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03.16)
-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

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Weighted average interest rate of debt outstanding.

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