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Valuation Fair Value, Other Financial Instruments (Details) - USD ($)
$ in Thousands

Sep. 30, 2018

Dec. 31, 2017

Sep. 30, 2017

^[1]

Dec. 31, 2016

^[1]

Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]

Cash and cash equivalents

$ 41,016

$ 56,117

$ 50,271

$ 33,504

Due from brokers

27,044

26,754

Reverse repurchase agreements

^[2]

26,769

81,461

Repurchase agreements

^[2]

1,500,632

1,597,206

Due to brokers

8,298

489

Estimate of Fair Value Measurement [Member]

Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]

Cash and Cash Equivalents

41,016

56,117

Due from brokers

27,044

26,754

Reverse repurchase agreements

26,769

81,461

Repurchase agreements

1,500,632

1,597,206

Due to brokers

8,298

489

Reported Value Measurement [Member]

Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]

Cash and cash equivalents

41,016

56,117

Due from brokers

27,044

26,754

Reverse repurchase agreements

26,769

81,461

Repurchase agreements

1,500,632

1,597,206

Due to brokers

$ 8,298

$ 489

[1]	Conformed to current period presentation.
[2]	In the Company's Consolidated Balance Sheet, all balances associated with the repurchase agreements and financial derivatives are presented on a gross basis.

X

- Definition

The amount of cash held with a broker or counterparty as collateral/margin for investment or derivative security positions. In addition this amount can also include amounts owed to the Company for opened or closed derivative positions.

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The amount of cash owed to a broker or counterparty which was received by the Company as collateral/margin for investment or derivative security positions. In addition this amount can also include amounts owed to the broker or counterparty for opened or closed derivative positions.

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