CONSOLIDATED STATEMENTS OF EQUITY - USD ($) shares in Thousands, $ in Thousands	Common Stock	AOCI	Parent [Member]	Noncontrolling Interest in Consolidated Funds and Ventures (“CFVs”)	Total
Balance at Dec. 31, 2017	$ 96,420	$ 41,153	$ 137,573	$ 89,529	$ 227,102
Balance (in shares) at Dec. 31, 2017	5,617
Net income	$ 18,340		18,340		18,340
Other comprehensive (loss) income		9,160	9,160		9,160
Purchases of shares in a subsidiary (including price adjustments on prior purchases)	(73)		(73)		(73)
Common shares (restricted and deferred) issued under employee and non-employee director share plans	$ 82		82		82
Common shares (restricted and deferred) issued under employee and non-employee director share plans (in shares)	3
Net change due to deconsolidation				(89,529)	(89,529)
Cumulative change due to change in accounting principle	$ 9,206		9,206		9,206
Common shares issued	$ 4,125		4,125		4,125
Common shares issued (in shares)	125
Balance at Mar. 31, 2018	$ 128,100	50,313	178,413		178,413
Balance (in shares) at Mar. 31, 2018	5,745
Balance at Dec. 31, 2017	$ 96,420	41,153	137,573	89,529	227,102
Balance (in shares) at Dec. 31, 2017	5,617
Net income					21,102
Balance at Jun. 30, 2018	$ 132,322	54,360	186,682		186,682
Balance (in shares) at Jun. 30, 2018	5,769
Balance at Dec. 31, 2017	$ 96,420	41,153	137,573	$ 89,529	227,102
Balance (in shares) at Dec. 31, 2017	5,617
Balance at Dec. 31, 2018	$ 175,213	37,697			212,910
Balance (in shares) at Dec. 31, 2018	5,882
Balance at Mar. 31, 2018	$ 128,100	50,313	178,413		178,413
Balance (in shares) at Mar. 31, 2018	5,745
Net income	$ 2,762		2,762		2,762
Other comprehensive (loss) income		4,047	4,047		4,047
Options exercised (value)	$ 784		784		784
Options exercised (shares)	30
Common shares (restricted and deferred) issued under employee and non-employee director share plans	$ 82		82		82
Common shares (restricted and deferred) issued under employee and non-employee director share plans (in shares)	3
Common shares issued	$ 4,250		4,250		4,250
Common shares issued (in shares)	125
Options tendered for payment of withholding taxes, value	$ (315)		(315)		(315)
Options tendered for payment of withholding taxes, shares	(13)
Common share repurchases	$ (3,341)		(3,341)		(3,341)
Common share repurchases (in shares)	(121)
Balance at Jun. 30, 2018	$ 132,322	54,360	$ 186,682		186,682
Balance (in shares) at Jun. 30, 2018	5,769
Balance at Dec. 31, 2018	$ 175,213	37,697			212,910
Balance (in shares) at Dec. 31, 2018	5,882
Net income	$ 2,882				2,882
Other comprehensive (loss) income		(3,140)			(3,140)
Common shares (restricted and deferred) issued under employee and non-employee director share plans	$ 82				82
Common shares (restricted and deferred) issued under employee and non-employee director share plans (in shares)	2
Cumulative change due to change in accounting principle	$ (267)				(267)
Balance at Mar. 31, 2019	$ 177,910	34,557			212,467
Balance (in shares) at Mar. 31, 2019	5,884
Balance at Dec. 31, 2018	$ 175,213	37,697			212,910
Balance (in shares) at Dec. 31, 2018	5,882
Net income					26,101
Balance at Jun. 30, 2019	$ 201,212	13,414			214,626
Balance (in shares) at Jun. 30, 2019	5,887
Balance at Mar. 31, 2019	$ 177,910	34,557			212,467
Balance (in shares) at Mar. 31, 2019	5,884
Net income	$ 23,219				23,219
Other comprehensive (loss) income		(21,143)			(21,143)
Common shares (restricted and deferred) issued under employee and non-employee director share plans	$ 83				83
Common shares (restricted and deferred) issued under employee and non-employee director share plans (in shares)	3
Balance at Jun. 30, 2019	$ 201,212	$ 13,414			$ 214,626
Balance (in shares) at Jun. 30, 2019	5,887