CONSOLIDATED STATEMENTS OF EQUITY - USD ($) shares in Thousands, $ in Thousands	Common Shares	AOCI	Total
Balance at Dec. 31, 2018	$ 175,213	$ 37,697	$ 212,910
Balance (in shares) at Dec. 31, 2018	5,882
Net (loss) income	$ 2,882	0	2,882
Other comprehensive gain (loss)	0	(3,140)	(3,140)
Common shares (restricted and deferred) issued under employee and non-employee director share plans	$ 82	0	82
Common shares (restricted and deferred) issued under employee and non-employee director share plans (in shares)	2
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 (loss) income			26,101
Balance at Jun. 30, 2019	$ 201,212	13,414	214,626
Balance (in shares) at Jun. 30, 2019	5,887
Cumulative Effect of New Accounting Principle in Period of Adoption	$ (267)	0	(267)
Balance at Mar. 31, 2019	$ 177,910	34,557	212,467
Balance (in shares) at Mar. 31, 2019	5,884
Net (loss) income	$ 23,219	0	23,219
Other comprehensive gain (loss)	0	(21,143)	(21,143)
Common shares (restricted and deferred) issued under employee and non-employee director share plans	$ 83	0	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
Balance at Dec. 31, 2019	$ 273,492	7,633	281,125
Balance (in shares) at Dec. 31, 2019	5,805
Net (loss) income	$ (3,058)	0	(3,058)
Other comprehensive gain (loss)	0	(453)	(453)
Common shares (restricted and deferred) issued under employee and non-employee director share plans	$ 96	0	96
Common shares (restricted and deferred) issued under employee and non-employee director share plans (in shares)	3
Common share repurchases	$ (41)	0	(41)
Common share repurchases (in shares)	(1)
Balance at Mar. 31, 2020	$ 270,489	7,180	277,669
Balance (in shares) at Mar. 31, 2020	5,807
Balance at Dec. 31, 2019	$ 273,492	7,633	281,125
Balance (in shares) at Dec. 31, 2019	5,805
Net (loss) income			(6,566)
Balance at Jun. 30, 2020	$ 267,078	7,409	274,487
Balance (in shares) at Jun. 30, 2020	5,811
Balance at Mar. 31, 2020	$ 270,489	7,180	277,669
Balance (in shares) at Mar. 31, 2020	5,807
Net (loss) income	$ (3,508)	0	(3,508)
Other comprehensive gain (loss)	0	229	229
Common shares (restricted and deferred) issued under employee and non-employee director share plans	$ 97	0	97
Common shares (restricted and deferred) issued under employee and non-employee director share plans (in shares)	4
Balance at Jun. 30, 2020	$ 267,078	$ 7,409	$ 274,487
Balance (in shares) at Jun. 30, 2020	5,811