Offsetting Assets and Liabilities (Details) $ in Thousands	6 Months Ended
Jun. 30, 2018 USD ($) counterparty	Dec. 31, 2017 USD ($)
Swaps, at fair value
Gross Amounts of Recognized Assets	$ 11,183	$ 679
Gross Amounts Offset in the Consolidated Balance Sheets	0	0
Net Amounts of Assets Presented in the Consolidated Balance Sheets	11,183	679
Gross Amounts Not Offset in the Consolidated Balance Sheets
Financial Instruments	(11,183)	(679)
Cash Collateral Received	0	0
Net Amount	0	0
Swaps, at fair value
Gross Amounts of Recognized Liabilities	0	0
Gross Amounts Offset in the Consolidated Balance Sheets	0	0
Net Amounts of Liabilities Presented in the Consolidated Balance Sheets	0	0
Gross Amounts Not Offset in the Consolidated Balance Sheets
Financial Instruments	0	0
Cash Collateral Pledged	0	0
Net Amount	0	0
Repurchase agreements
Gross Amounts of Recognized Liabilities	5,892,281	6,614,907
Gross Amounts Offset in the Consolidated Balance Sheets	0	0
Net Amounts of Liabilities Presented in the Consolidated Balance Sheets	5,892,281	6,614,907
Gross Amounts Not Offset in the Consolidated Balance Sheets
Financial Instruments	(5,888,983)	(6,608,005)
Cash Collateral Pledged	(3,298)	(6,902)
Net Amount	0	0
Total
Gross Amounts of Recognized Liabilities	5,892,281	6,614,907
Gross Amounts Offset in the Consolidated Balance Sheets	0	0
Net Amounts of Liabilities Presented in the Consolidated Balance Sheets	5,892,281	6,614,907
Gross Amounts Not Offset in the Consolidated Balance Sheet
Financial Instruments	(5,888,983)	(6,608,005)
Cash Collateral Pledged	(3,298)	(6,902)
Net Amount	0	0
Additional disclosures
Fair value of securities pledged against the swaps	3,100	21,800
Fair value of financial instruments pledged against the repurchase agreements and other advances	7,200,000	8,100,000
Unamortized debt issuance expense	$ 53	206
Number of repurchase agreement counterparties with unconditional right of setoff \| counterparty	1
Swaps, at fair value
Swaps, at fair value
Gross Amounts of Recognized Assets	$ 11,183	679
Gross Amounts Offset in the Consolidated Balance Sheets	0	0
Net Amounts of Assets Presented in the Consolidated Balance Sheets	11,183	679
Gross Amounts Not Offset in the Consolidated Balance Sheets
Financial Instruments	(11,183)	(679)
Cash Collateral Received	0	0
Net Amount	$ 0	$ 0

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-Subparagraph (SX 210.5-02.17)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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