CONSOLIDATED STATEMENTS OF EQUITY - USD ($) shares in Thousands, $ in Thousands	Common Stock [Member]	AOCI [Member]	Parent [Member]	Noncontrolling Interest [Member]	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					29,726
Balance at Sep. 30, 2018	$ 142,562	50,985	193,547		193,547
Balance (in shares) at Sep. 30, 2018	5,830
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
Net income	$ 8,624		8,624		8,624
Other comprehensive (loss) income		(3,375)	(3,375)		(3,375)
Options exercised (value)	$ 4,057		4,057		4,057
Options exercised (shares)	158
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
Options tendered for payment of withholding taxes, value	$ (1,751)		(1,751)		(1,751)
Options tendered for payment of withholding taxes, shares	(72)
Common share repurchases	$ (772)		(772)		(772)
Common share repurchases (in shares)	(28)
Balance at Sep. 30, 2018	$ 142,562	50,985	$ 193,547		193,547
Balance (in shares) at Sep. 30, 2018	5,830
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					31,677
Balance at Sep. 30, 2019	$ 206,854	12,741			219,595
Balance (in shares) at Sep. 30, 2019	5,889
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
Net income	$ 5,576				5,576
Other comprehensive (loss) income		(673)			(673)
Common shares (restricted and deferred) issued under employee and non-employee director share plans	$ 66				66
Common shares (restricted and deferred) issued under employee and non-employee director share plans (in shares)	2
Balance at Sep. 30, 2019	$ 206,854	$ 12,741			$ 219,595
Balance (in shares) at Sep. 30, 2019	5,889