Condensed Consolidated Statement of Shareholders' Equity (Deficit) - USD ($) $ in Thousands	Total	Common Stock	Capital in Excess of Par Value	Retained Deficit	Accumulated Other Comprehensive Loss
Increase (Decrease) in Stockholders' Equity (Deficit) [Roll Forward]
Cumulative-effect adjustment for the adoption of ASU 2017-12	$ 0			$ 275	$ (275)
Balance, shares at Dec. 31, 2017		22,018,010
Balance, value at Dec. 31, 2017	66,894	$ 220	$ 333,011	(161,165)	(105,172)
Increase (Decrease) in Stockholders' Equity (Deficit) [Roll Forward]
Net income (loss)	(2,961)			(2,961)
Other comprehensive income (loss)	6,558				6,558
Stock compensation expense	270		270
Dividends	(2,595)			(2,595)
Stock withheld for employee taxes	(203)		(203)
Stock issued, shares		63,582
Stock issued, value	92	$ 1	91
Balance, shares at Mar. 31, 2018		22,081,592
Balance, value at Mar. 31, 2018	68,055	$ 221	333,169	(166,446)	(98,889)
Balance, shares at Dec. 31, 2017		22,018,010
Balance, value at Dec. 31, 2017	66,894	$ 220	333,011	(161,165)	(105,172)
Increase (Decrease) in Stockholders' Equity (Deficit) [Roll Forward]
Net income (loss)	1,027
Other comprehensive income (loss)	2,517
Balance, shares at Jun. 30, 2018		22,132,408
Balance, value at Jun. 30, 2018	69,122	$ 221	334,289	(162,458)	(102,930)
Balance, shares at Mar. 31, 2018		22,081,592
Balance, value at Mar. 31, 2018	68,055	$ 221	333,169	(166,446)	(98,889)
Increase (Decrease) in Stockholders' Equity (Deficit) [Roll Forward]
Net income (loss)	3,988			3,988
Other comprehensive income (loss)	(4,041)				(4,041)
Stock compensation expense	1,131		1,131
Stock withheld for employee taxes	(11)		(11)
Stock issued, shares		50,816
Stock issued, value	0	$ 0	0
Balance, shares at Jun. 30, 2018		22,132,408
Balance, value at Jun. 30, 2018	69,122	$ 221	334,289	(162,458)	(102,930)
Balance, shares at Dec. 31, 2018		22,157,220
Balance, value at Dec. 31, 2018	49,893	$ 222	335,517	(171,441)	(114,405)
Increase (Decrease) in Stockholders' Equity (Deficit) [Roll Forward]
Net income (loss)	(4,542)			(4,542)
Other comprehensive income (loss)	(2,303)				(2,303)
Stock compensation expense	937		937
Stock withheld for employee taxes	(317)		(317)
Stock issued, shares		116,348
Stock issued, value	(7)	$ 1	(8)
Balance, shares at Mar. 31, 2019		22,273,568
Balance, value at Mar. 31, 2019	43,661	$ 223	336,129	(175,983)	(116,708)
Balance, shares at Dec. 31, 2018		22,157,220
Balance, value at Dec. 31, 2018	49,893	$ 222	335,517	(171,441)	(114,405)
Increase (Decrease) in Stockholders' Equity (Deficit) [Roll Forward]
Net income (loss)	(48,309)
Other comprehensive income (loss)	(5,894)
Balance, shares at Jun. 30, 2019		22,347,086
Balance, value at Jun. 30, 2019	(2,671)	$ 223	337,155	(219,750)	(120,299)
Balance, shares at Mar. 31, 2019		22,273,568
Balance, value at Mar. 31, 2019	43,661	$ 223	336,129	(175,983)	(116,708)
Increase (Decrease) in Stockholders' Equity (Deficit) [Roll Forward]
Net income (loss)	(43,767)			(43,767)
Other comprehensive income (loss)	(3,591)				(3,591)
Stock compensation expense	1,117		1,117
Stock withheld for employee taxes	(92)		(92)
Stock issued, shares		73,518
Stock issued, value	1	$ 0	1
Balance, shares at Jun. 30, 2019		22,347,086
Balance, value at Jun. 30, 2019	$ (2,671)	$ 223	$ 337,155	$ (219,750)	$ (120,299)