CONSOLIDATED STATEMENTS OF EQUITY - USD ($) shares in Thousands, $ in Thousands	Common Stock [Member]	Additional Paid-in-Capital [Member]	Accumulated Other Comprehensive Loss [Member]	Company Shares Held by SERP [Member]	Retained Earnings [Member]	Non-Controlling Interest [Member]	Total
Balance at Dec. 31, 2015	$ 4,598	$ 137,883	$ (23,564)	$ (1,778)	$ 490,933	$ 1,786	$ 609,858
Balance (in shares) at Dec. 31, 2015	22,988
Net income (loss)					55,159	(171)	54,988
Dividends		9			(9,226)		(9,217)
Other comprehensive income (loss)			(7,998)				(7,998)
Change in ownership percentage of subsidiary						(1,322)	(1,322)
Stock-based compensation	$ 1	2,935					2,936
Stock-based compensation (in shares)	5
RSU vesting	$ 10	(10)					0
RSU vesting (in shares)	53
Withholding tax on vested RSUs		(1,024)					(1,024)
Sale of Company stock held by SERP, net		27		(180)			(153)
Other						718	718
Balance at Dec. 31, 2016	$ 4,609	139,970	(31,562)	(1,958)	536,771	1,011	648,841
Balance (in shares) at Dec. 31, 2016	23,046
Cumulative effect of adopting ASU No. 2016-09		150			(95)		55
Net income (loss)					37,795	(205)	37,590
Dividends		10			(9,236)		(9,226)
Other comprehensive income (loss)			7,319				7,319
Change in ownership percentage of subsidiary						(43)	(43)
Stock-based compensation		2,172					2,172
Stock-based compensation (in shares)	1
RSU vesting	$ 5	(5)					0
RSU vesting (in shares)	23
Withholding tax on vested RSUs		(507)					(507)
Sale of Company stock held by SERP, net		291		(2)			289
Other						330	330
Balance at Dec. 31, 2017	$ 4,614	141,931	(24,243)	(1,960)	565,330	1,093	$ 686,765
Balance (in shares) at Dec. 31, 2017	23,070						23,070
Net income (loss)					(60,449)	(295)	$ (60,744)
Dividends		11			(9,636)		(9,625)
Other comprehensive income (loss)			(9,640)				(9,640)
Change in ownership percentage of subsidiary						(159)	(159)
Stock-based compensation		2,815					2,815
Stock-based compensation (in shares)	2
RSU vesting	$ 5	(5)					0
RSU vesting (in shares)	23
Withholding tax on vested RSUs		(432)					(432)
Sale of Company stock held by SERP, net		303		74			377
Repurchase of Company stock	$ (116)	(24,022)					(24,138)
Repurchase of Company stock (in shares)	(582)
Other						71	71
Balance at Dec. 31, 2018	$ 4,503	$ 120,601	$ (33,883)	$ (1,886)	$ 495,245	$ 710	$ 585,290
Balance (in shares) at Dec. 31, 2018	22,513						22,513