Consolidated Statement Of Changes In Equity (USD $) In Thousands, unless otherwise specified		Total		Parent [Member]	Noncontrolling Interest [Member]
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest at Dec. 31, 2012		$ 506,355
Stockholders' Equity Attributable to Noncontrolling Interest at Dec. 31, 2012					0
Stockholders' Equity Attributable to Parent at Dec. 31, 2012				506,355
CHANGE IN SHAREHOLDERS’ EQUITY RESULTING FROM OPERATIONS
Net investment income		10,569
Net realized gain (loss) on investments, financial derivatives, and foreign currency transactions		12,592
Total Net Unrealized Gain Loss On Investments, Financial derivatives, and Foreign currency translation		17,585
Net Income (Loss) Attributable to Parent		40,335		40,335
Net Income (Loss) Attributable to Noncontrolling Interest		411			411
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest		40,746
CHANGE IN EQUITY RESULTING FROM TRANSACTIONS
Shares issued in connection with incentive fee payment		734		734
Noncontrolling Interest, Increase from Sale of Parent Equity Interest		4,664			4,664
Dividends	[1]	(31,939)	[2]	(31,617)	(322)
Distributions to non-controlling interest		0			0
Adjustments to non-controlling interests		0		0	0
Share-based LTIP awards		42		41	1
Net increase (decrease) in equity from transactions		(26,499)		(30,842)	4,343
Net increase in equity		14,247		9,493	4,754
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest at Mar. 31, 2013		520,602
Stockholders' Equity Attributable to Noncontrolling Interest at Mar. 31, 2013					4,754
Stockholders' Equity Attributable to Parent at Mar. 31, 2013				515,848
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest at Dec. 31, 2013		626,049
Stockholders' Equity Attributable to Noncontrolling Interest at Dec. 31, 2013		5,648			5,648
Stockholders' Equity Attributable to Parent at Dec. 31, 2013		620,401		620,401
CHANGE IN SHAREHOLDERS’ EQUITY RESULTING FROM OPERATIONS
Net investment income		14,081
Net realized gain (loss) on investments, financial derivatives, and foreign currency transactions		11,408
Total Net Unrealized Gain Loss On Investments, Financial derivatives, and Foreign currency translation		(2,651)
Net Income (Loss) Attributable to Parent		22,635		22,635
Net Income (Loss) Attributable to Noncontrolling Interest		203			203
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest		22,838
CHANGE IN EQUITY RESULTING FROM TRANSACTIONS
Shares issued in connection with incentive fee payment		309		309
Noncontrolling Interest, Increase from Sale of Parent Equity Interest		1,001			1,001
Dividends	[1]	(20,070)	[2]	(19,907)	(163)
Distributions to non-controlling interest		(114)			(114)
Adjustments to non-controlling interests		0		(497)	497
Share-based LTIP awards		63		62	1
Net increase (decrease) in equity from transactions		(18,811)		(20,033)	1,222
Net increase in equity		4,027		2,602	1,425
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest at Mar. 31, 2014		630,076
Stockholders' Equity Attributable to Noncontrolling Interest at Mar. 31, 2014		7,073			7,073
Stockholders' Equity Attributable to Parent at Mar. 31, 2014		$ 623,003		$ 623,003

[1] For the three month periods ended March 31, 2014 and 2013, dividends totaling $0.77 and $1.52, respectively, per common share and convertible unit outstanding, were declared and paid.

[2] The Company pays quarterly dividends in arrears, so a portion of the dividends paid in each calendar year relate to the prior year's earnings.