Consolidated Condensed Schedule Of Investments (Repurchase Agreements) - USD ($) $ in Thousands		3 Months Ended		12 Months Ended
		Mar. 31, 2016		Dec. 31, 2015
Schedule of Investments [Line Items]
Fair value repurchase agreements	[1]	$ 127,468		$ 105,700
Repurchase agreements, cost		126,867		105,329
Repurchase Agreements [Member]
Schedule of Investments [Line Items]
Fair value repurchase agreements		$ 127,468	[2],[3]	$ 105,700	[4],[5]
Investment owned as a percentage of equity		18.34%	[2],[3],[6]	14.30%	[4],[5],[7]
Repurchase agreements, cost		$ 126,867	[2],[3]	$ 105,329	[4],[5]
Repurchase Agreements [Member] | Barclays Capital Inc. Collateralized By Par Value $15,673 Sovereign Government Bond, Coupon 0.25% Maturity Date 2014-18 [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount	[2],[3]	16,085
Securities collateralized by par value	[2],[3]	$ 15,673
Coupon rate on underlying collateral	[2],[3]	0.25%
Maturity date of securities	[2],[3]	2018-04
Rate	[2],[3]	(0.60%)
Investments maturity date	[2],[3]	2016-04
Fair value repurchase agreements	[2],[3]	$ 16,085
Repurchase Agreements [Member] | Bank of America Securities Collateralized By Par Value $15,000 U.S. Treasury Note Coupon 2.00% Maturity Date 2025-02 [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount		15,244	[2],[3]	14,756	[4],[5]
Securities collateralized by par value		$ 15,000	[2],[3]	$ 15,000	[4],[5]
Coupon rate on underlying collateral		2.00%	[2],[3]	2.00%	[4],[5]
Maturity date of securities		2025-02	[2],[3]	2025-02	[4],[5]
Rate		0.40%	[2],[3]	0.35%	[4],[5]
Investments maturity date		2016-04	[2],[3]	2016-01	[4],[5]
Fair value repurchase agreements		$ 15,244	[2],[3]	$ 14,756	[4],[5]
Repurchase Agreements [Member] | Merrill Lynch International Collateralized By Par Value $13,503 Sovereign Government Bond Coupon 0.25% Maturity Date 2020-11 [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount	[2],[3]	13,850
Securities collateralized by par value	[2],[3]	$ 13,503
Coupon rate on underlying collateral	[2],[3]	0.25%
Maturity date of securities	[2],[3]	2020-11
Rate	[2],[3]	(0.56%)
Investments maturity date	[2],[3]	2016-04
Fair value repurchase agreements	[2],[3]	$ 13,850
Repurchase Agreements [Member] | Barclays Capital Inc. Collateralized By Par Value $8,920 Sovereign Government Bond, Coupon 1.15% Maturity Date 2020-07 [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount	[2],[3]	9,456
Securities collateralized by par value	[2],[3]	$ 8,920
Coupon rate on underlying collateral	[2],[3]	1.15%
Maturity date of securities	[2],[3]	2020-07
Rate	[2],[3]	(0.95%)
Investments maturity date	[2],[3]	2016-04
Fair value repurchase agreements	[2],[3]	$ 9,456
Repurchase Agreements [Member] | Deutsche Bank Securities Collateralized By Par Value $8,920 Sovereign Government Bond Coupon 0.65% Maturity Date 2020-11 [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount	[2],[3]	9,147
Securities collateralized by par value	[2],[3]	$ 8,920
Coupon rate on underlying collateral	[2],[3]	0.65%
Maturity date of securities	[2],[3]	2020-11
Rate	[2],[3]	(0.50%)
Investments maturity date	[2],[3]	2016-04
Fair value repurchase agreements	[2],[3]	$ 9,147
Repurchase Agreements [Member] | Barclays Capital Inc. Collateralized By Par Value $7,396 Sovereign Government Bond, Coupon 2.75% Maturity Date 2019-04 [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount	[2],[3]	8,329
Securities collateralized by par value	[2],[3]	$ 7,396
Coupon rate on underlying collateral	[2],[3]	2.75%
Maturity date of securities	[2],[3]	2019-04
Rate	[2],[3]	(0.60%)
Investments maturity date	[2],[3]	2016-04
Fair value repurchase agreements	[2],[3]	$ 8,329
Repurchase Agreements [Member] | Bank of America Securities Collateralized By Par Value $8,030 U.S. Treasury Bond Coupon 2.50% Maturity Date 2046-02 [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount	[2],[3]	7,829
Securities collateralized by par value	[2],[3]	$ 8,030
Coupon rate on underlying collateral	[2],[3]	2.50%
Maturity date of securities	[2],[3]	2046-02
Rate	[2],[3]	0.15%
Investments maturity date	[2],[3]	2016-04
Fair value repurchase agreements	[2],[3]	$ 7,829
Repurchase Agreements [Member] | Bank of America Securities Collateralized By Par Value $5,238 U.S. Treasury Note, Coupon 2.25% Maturity Date 2025-11 [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount	[2],[3]	5,461
Securities collateralized by par value	[2],[3]	$ 5,238
Coupon rate on underlying collateral	[2],[3]	2.25%
Maturity date of securities	[2],[3]	2025-11
Rate	[2],[3]	0.40%
Investments maturity date	[2],[3]	2016-04
Fair value repurchase agreements	[2],[3]	$ 5,461
Repurchase Agreements [Member] | Bank of America Securities Collateralized By Par Value $5,000 U.S. Treasury Note, Coupon 1.25% Maturity Date 2018-10 [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount		5,063	[2],[3]	5,000	[4],[5]
Securities collateralized by par value		$ 5,000	[2],[3]	$ 5,000	[4],[5]
Coupon rate on underlying collateral		1.25%	[2],[3]	1.25%	[4],[5]
Maturity date of securities		2018-10	[2],[3]	2018-10	[4],[5]
Rate		0.40%	[2],[3]	0.30%	[4],[5]
Investments maturity date		2016-04	[2],[3]	2016-01	[4],[5]
Fair value repurchase agreements		$ 5,063	[2],[3]	$ 5,000	[4],[5]
Repurchase Agreements [Member] | Bank of America Securities Collateralized by Par Value $4,524 U.S. Treasury Note, Coupon 1.63%, Maturity Date 2026-02 [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount	[2],[3]	4,456
Securities collateralized by par value	[2],[3]	$ 4,524
Coupon rate on underlying collateral	[2],[3]	1.63%
Maturity date of securities	[2],[3]	2026-02
Rate	[2],[3]	(0.25%)
Investments maturity date	[2],[3]	2016-04
Fair value repurchase agreements	[2],[3]	$ 4,456
Repurchase Agreements [Member] | Bank of America Securities Collateralized By Par Value $4,000 U.S. Treasury Note, Coupon 1.63% Maturity Date 2020-06 [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount		4,070	[2],[3]	3,980	[4],[5]
Securities collateralized by par value		$ 4,000	[2],[3]	$ 4,000	[4],[5]
Coupon rate on underlying collateral		1.63%	[2],[3]	1.63%	[4],[5]
Maturity date of securities		2020-06	[2],[3]	2020-06	[4],[5]
Rate		0.40%	[2],[3]	0.40%	[4],[5]
Investments maturity date		2016-04	[2],[3]	2016-01	[4],[5]
Fair value repurchase agreements		$ 4,070	[2],[3]	$ 3,980	[4],[5]
Repurchase Agreements [Member] | Bank of America Securities Collateralized By Par Value $4,000 U.S. Treasury Note, Coupon 1.50% Maturity Date 2020-05 [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount		4,055	[2],[3]	3,965	[4],[5]
Securities collateralized by par value		$ 4,000	[2],[3]	$ 4,000	[4],[5]
Coupon rate on underlying collateral		1.50%	[2],[3]	1.50%	[4],[5]
Maturity date of securities		2020-05	[2],[3]	2020-05	[4],[5]
Rate		0.40%	[2],[3]	0.40%	[4],[5]
Investments maturity date		2016-04	[2],[3]	2016-01	[4],[5]
Fair value repurchase agreements		$ 4,055	[2],[3]	$ 3,965	[4],[5]
Repurchase Agreements [Member] | Bank of America Securities Collateralized By Par Value $4,000 U.S. Treasury Note, Coupon 1.38% Maturity Date 2020-03 [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount		4,050	[2],[3]	3,960	[4],[5]
Securities collateralized by par value		$ 4,000	[2],[3]	$ 4,000	[4],[5]
Coupon rate on underlying collateral		1.38%	[2],[3]	1.38%	[4],[5]
Maturity date of securities		2020-03	[2],[3]	2020-03	[4],[5]
Rate		0.40%	[2],[3]	0.40%	[4],[5]
Investments maturity date		2016-04	[2],[3]	2016-01	[4],[5]
Fair value repurchase agreements		$ 4,050	[2],[3]	$ 3,960	[4],[5]
Repurchase Agreements [Member] | Bank of America Securities Collateralized by Par Value $3,776 U.S. Treasury Note, Coupon 1.38%, Maturity Date 2021-01 [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount	[2],[3]	3,804
Securities collateralized by par value	[2],[3]	$ 3,776
Coupon rate on underlying collateral	[2],[3]	1.38%
Maturity date of securities	[2],[3]	2021-01
Rate	[2],[3]	0.20%
Investments maturity date	[2],[3]	2016-04
Fair value repurchase agreements	[2],[3]	$ 3,804
Repurchase Agreements [Member] | Bank of America Securities Collateralized by Par Value $3,400 U.S. Treasury Note, Coupon 1.63%, Maturity Date 2020-11 [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount	[2],[3]	3,464
Securities collateralized by par value	[2],[3]	$ 3,400
Coupon rate on underlying collateral	[2],[3]	1.63%
Maturity date of securities	[2],[3]	2020-11
Rate	[2],[3]	0.40%
Investments maturity date	[2],[3]	2016-04
Fair value repurchase agreements	[2],[3]	$ 3,464
Repurchase Agreements [Member] | Bank of America Securities Collateralized by Par Value $3,200 U.S. Treasury Note, Coupon 2.25% Maturity Date 2024-11 [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount		3,340	[2],[3]	3,204	[4],[5]
Securities collateralized by par value		$ 3,200	[2],[3]	$ 3,200	[4],[5]
Coupon rate on underlying collateral		2.25%	[2],[3]	2.25%	[4],[5]
Maturity date of securities		2024-11	[2],[3]	2024-11	[4],[5]
Rate		0.40%	[2],[3]	0.40%	[4],[5]
Investments maturity date		2016-04	[2],[3]	2016-01	[4],[5]
Fair value repurchase agreements		$ 3,340	[2],[3]	$ 3,204	[4],[5]
Repurchase Agreements [Member] | Bank of America Securities Collateralized By Par Value $2,000 U.S. Treasury Note Coupon 2.00% Maturity Date 2022-07 [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount		2,055	[2],[3]	2,008	[4],[5]
Securities collateralized by par value		$ 2,000	[2],[3]	$ 2,000	[4],[5]
Coupon rate on underlying collateral		2.00%	[2],[3]	2.00%	[4],[5]
Maturity date of securities		2022-07	[2],[3]	2022-07	[4],[5]
Rate		0.40%	[2],[3]	0.35%	[4],[5]
Investments maturity date		2016-04	[2],[3]	2016-01	[4],[5]
Fair value repurchase agreements		$ 2,055	[2],[3]	$ 2,008	[4],[5]
Repurchase Agreements [Member] | Bank of America Securities Collateralized By Par Value $2,000 U.S. Treasury Note Coupon 1.25% Maturity Date 2020-01 [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount		2,008	[2],[3]	1,978	[4],[5]
Securities collateralized by par value		$ 2,000	[2],[3]	$ 2,000	[4],[5]
Coupon rate on underlying collateral		1.25%	[2],[3]	1.25%	[4],[5]
Maturity date of securities		2020-01	[2],[3]	2020-01	[4],[5]
Rate		0.40%	[2],[3]	0.25%	[4],[5]
Investments maturity date		2016-04	[2],[3]	2016-01	[4],[5]
Fair value repurchase agreements		$ 2,008	[2],[3]	$ 1,977	[4],[5]
Repurchase Agreements [Member] | Bank of America Securities Collateralized by Par Value $1,942 U.S. Treasury Note, Coupon 1.13%, Maturity Date 2021-02 [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount	[2],[3]	1,932
Securities collateralized by par value	[2],[3]	$ 1,942
Coupon rate on underlying collateral	[2],[3]	1.13%
Maturity date of securities	[2],[3]	2021-02
Rate	[2],[3]	(0.05%)
Investments maturity date	[2],[3]	2016-04
Fair value repurchase agreements	[2],[3]	$ 1,932
Repurchase Agreements [Member] | Deutsche Bank Securities Collateralized by Par Value $1,868 Sovereign Government Bond, Coupon 4.00%, Maturity Date 2016-09 [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount	[2],[3]	1,931
Securities collateralized by par value	[2],[3]	$ 1,868
Coupon rate on underlying collateral	[2],[3]	4.00%
Maturity date of securities	[2],[3]	2016-09
Rate	[2],[3]	0.44%
Investments maturity date	[2],[3]	2016-04
Fair value repurchase agreements	[2],[3]	$ 1,931
Repurchase Agreements [Member] | RBC Capital Markets LLC Collateralized by Par Value $571 Exchange-Traded Corporate Debt, Coupon 3.90%, Maturity Date 2021-08 [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount	[2],[3]	654
Securities collateralized by par value	[2],[3]	$ 571
Coupon rate on underlying collateral	[2],[3]	3.90%
Maturity date of securities	[2],[3]	2021-08
Rate	[2],[3]	0.05%
Investments maturity date	[2],[3]	2016-04
Fair value repurchase agreements	[2],[3]	$ 654
Repurchase Agreements [Member] | CS First Boston Collateralized by Par Value $572 Exchange-Traded Corporate Debt, Coupon 0.88%, Maturity Date 2021-05 [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount	[2],[3]	623
Securities collateralized by par value	[2],[3]	$ 572
Coupon rate on underlying collateral	[2],[3]	0.88%
Maturity date of securities	[2],[3]	2021-05
Rate	[2],[3]	0.00%
Investments maturity date	[2],[3]	2016-04
Fair value repurchase agreements	[2],[3]	$ 623
Repurchase Agreements [Member] | RBC Capital Markets LLC Collateralized by Par Value $571 Exchange-Traded Corporate Debt, Coupon 0.13%, Maturity Date 2022-06 [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount	[2],[3]	562
Securities collateralized by par value	[2],[3]	$ 571
Coupon rate on underlying collateral	[2],[3]	0.13%
Maturity date of securities	[2],[3]	2022-06
Rate	[2],[3]	(0.25%)
Investments maturity date	[2],[3]	2016-04
Fair value repurchase agreements	[2],[3]	$ 562
Repurchase Agreements [Member] | Bank of America Securities Collateralized by Par Value $19,570 U.S. Treasury Note, Coupon 1.63% Maturity Date 2020-11 [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount	[4],[5]			19,472
Securities collateralized by par value	[4],[5]			$ 19,570
Coupon rate on underlying collateral	[4],[5]			1.63%
Maturity date of securities	[4],[5]			2020-11
Rate	[4],[5]			(0.25%)
Investments maturity date	[4],[5]			2016-01
Fair value repurchase agreements	[4],[5]			$ 19,472
Repurchase Agreements [Member] | Barclays Capital Inc. Collateralized by Par Value $14,941 Sovereign Government Bond, Coupon 0.25% Maturity Date 2018-04 [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount	[4],[5]			15,296
Securities collateralized by par value	[4],[5]			$ 14,941
Coupon rate on underlying collateral	[4],[5]			0.25%
Maturity date of securities	[4],[5]			2018-04
Rate	[4],[5]			(0.48%)
Investments maturity date	[4],[5]			2016-01
Fair value repurchase agreements	[4],[5]			$ 15,295
Repurchase Agreements [Member] | Deutsche Bank Securities Collateralized By Par Value $13,200 U.S. Treasury Note Coupon 2.25% Maturity Date 2025-11 [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount	[4],[5]			13,200
Securities collateralized by par value	[4],[5]			$ 13,200
Coupon rate on underlying collateral	[4],[5]			2.25%
Maturity date of securities	[4],[5]			2025-11
Rate	[4],[5]			(1.00%)
Investments maturity date	[4],[5]			2016-01
Fair value repurchase agreements	[4],[5]			$ 13,200
Repurchase Agreements [Member] | Bank of America Securities Collateralized By Par Value $8,250 U.S. Treasury Note, Coupon 1.75% Maturity Date 2020-12 [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount	[4],[5]			8,240
Securities collateralized by par value	[4],[5]			$ 8,250
Coupon rate on underlying collateral	[4],[5]			1.75%
Maturity date of securities	[4],[5]			2020-12
Rate	[4],[5]			0.40%
Investments maturity date	[4],[5]			2016-01
Fair value repurchase agreements	[4],[5]			$ 8,240
Repurchase Agreements [Member] | Barclays Capital Inc. Collateralized By Par Value $7.050 Sovereign Government Bond, Coupon 2.75% Maturity Date 2019-04 [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount	[4],[5]			7,905
Securities collateralized by par value	[4],[5]			$ 7,050
Coupon rate on underlying collateral	[4],[5]			2.75%
Maturity date of securities	[4],[5]			2019-04
Rate	[4],[5]			(0.48%)
Investments maturity date	[4],[5]			2016-01
Fair value repurchase agreements	[4],[5]			$ 7,905
Repurchase Agreements [Member] | RBC Capital Markets LLC Collateralized By Par Value $1,916 Sovereign Government Bond, Coupon 4.00% Maturity Date 2016-09 [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount	[4],[5]			1,985
Securities collateralized by par value	[4],[5]			$ 1,916
Coupon rate on underlying collateral	[4],[5]			4.00%
Maturity date of securities	[4],[5]			2016-09
Rate	[4],[5]			0.38%
Investments maturity date	[4],[5]			2016-01
Fair value repurchase agreements	[4],[5]			$ 1,985
Repurchase Agreements [Member] | CS First Boston Collateralized By Par Value $560 Exchange-Traded Corporate Debt Coupon 10.00% Maturity Date 2020-06 [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount	[4],[5]			417
Securities collateralized by par value	[4],[5]			$ 560
Coupon rate on underlying collateral	[4],[5]			10.00%
Maturity date of securities	[4],[5]			2020-06
Rate	[4],[5]			(3.25%)
Investments maturity date	[4],[5]			2016-01
Fair value repurchase agreements	[4],[5]			$ 417
Repurchase Agreements [Member] | RBC Capital Markets LLC Collateralized By Par Value $560 Exchange-Traded Corporate Debt Coupon 11.00% Maturity Date 2020-03 [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount	[4],[5]			336
Securities collateralized by par value	[4],[5]			$ 560
Coupon rate on underlying collateral	[4],[5]			11.00%
Maturity date of securities	[4],[5]			2020-03
Rate	[4],[5]			(0.75%)
Investments maturity date	[4],[5]			2016-01
Fair value repurchase agreements	[4],[5]			$ 336

[1] In the Company's Consolidated Statement of Assets, Liabilities, and Equity, all balances associated with repurchase agreements, reverse repurchase agreements, and financial derivatives are presented on a gross basis.

[2] In general, securities received pursuant to repurchase agreements were delivered to counterparties in short sale transactions.

[3] See Note 2 and Note 3 in Notes to Consolidated Financial Statements.

[4] In general, securities received pursuant to repurchase agreements were delivered to counterparties in short sale transactions.

[5] See Note 2 and Note 3 in Notes to Consolidated Financial Statements.

[6] Classification percentages are based on Total Equity.

[7] Classification percentages are based on Total Equity.