Consolidated Statement Of Changes In Equity - USD ($) $ in Thousands		Total		Parent [Member]	Noncontrolling Interest [Member]
Stockholders' Equity Attributable to Parent at Dec. 31, 2015				$ 732,049
Stockholders' Equity Attributable to Noncontrolling Interest at Dec. 31, 2015					$ 6,903
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest at Dec. 31, 2015		$ 738,952
CHANGE IN SHAREHOLDERS’ EQUITY RESULTING FROM OPERATIONS
Net investment income		11,822
Net realized gain (loss) on investments, financial derivatives, and foreign currency transactions		(11,940)
Change in net unrealized gain (loss) on investments, financial derivatives, and foreign currency translation		(23,068)
Net Income (Loss) Attributable to Parent		(23,200)		(23,200)
Net Income (Loss) Attributable to Noncontrolling Interest		14			14
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest		(23,186)
CHANGE IN EQUITY RESULTING FROM TRANSACTIONS
Contributions from non-controlling interests		684			684
Dividends	[1]	(16,872)	[2]	(16,766)	(106)
Distributions to non-controlling interest		(1,922)			(1,922)
Adjustment to non-controlling interest		0		(4)	4
Shares repurchased		(2,834)		(2,834)
Share-based LTIP awards		100		99	1
Net increase (decrease) in equity from transactions		(20,844)		(19,505)	(1,339)
Net increase (decrease) in equity		(44,030)		(42,705)	(1,325)
Stockholders' Equity Attributable to Parent at Mar. 31, 2016				689,344
Stockholders' Equity Attributable to Noncontrolling Interest at Mar. 31, 2016					5,578
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest at Mar. 31, 2016		694,922
Stockholders' Equity Attributable to Parent at Dec. 31, 2016		637,661		637,661
Stockholders' Equity Attributable to Noncontrolling Interest at Dec. 31, 2016		7,116			7,116
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest at Dec. 31, 2016		644,777
CHANGE IN SHAREHOLDERS’ EQUITY RESULTING FROM OPERATIONS
Net investment income		11,775
Net realized gain (loss) on investments, financial derivatives, and foreign currency transactions		(831)
Change in net unrealized gain (loss) on investments, financial derivatives, and foreign currency translation		4,786
Net Income (Loss) Attributable to Parent		15,278		15,278
Net Income (Loss) Attributable to Noncontrolling Interest		452			452
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest		15,730
CHANGE IN EQUITY RESULTING FROM TRANSACTIONS
Contributions from non-controlling interests		10,922			10,922
Dividends	[1]	(14,821)	[2]	(14,726)	(95)
Distributions to non-controlling interest		(195)			(195)
Adjustment to non-controlling interest		0		(3)	3
Shares repurchased		(2,052)		(2,052)
Share-based LTIP awards		94		93	1
Net increase (decrease) in equity from transactions		(6,052)		(16,688)	10,636
Net increase (decrease) in equity		9,678		(1,410)	11,088
Stockholders' Equity Attributable to Parent at Mar. 31, 2017		636,251		$ 636,251
Stockholders' Equity Attributable to Noncontrolling Interest at Mar. 31, 2017		18,204			$ 18,204
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest at Mar. 31, 2017		$ 654,455

[1] For the three month periods ended March 31, 2017 and 2016, dividends totaling $0.45 and $0.50 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.