Condensed Consolidated Statement of Equity (unaudited) - 9 months ended Sep. 30, 2018 - 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, 2017	$ 4,614	$ 141,931	$ (24,243)	$ (1,960)	$ 565,330	$ 1,093	$ 686,765
Balance (in shares) at Dec. 31, 2017	23,070
Net loss	$ 0	0	0	0	(13,411)	(238)	(13,649)
Other comprehensive loss	0	0	(7,780)	0	0	0	(7,780)
Change in ownership percentage of subsidiary	0	0	0	0	0	(120)	(120)
Dividends declared	0	8	0	0	(7,157)	0	(7,149)
Stock buy-back program	$ (59)	(13,855)	0	0	0	0	$ (13,914)
Stock buy-back program (in shares)	(296)						(297)
Stock-based compensation	$ 0	2,301	0	0	0	0	$ 2,301
Stock issued under incentive plans	$ 5	(5)	0	0	0	0	0
Stock issued under incentive plans (in shares)	24
Withholding tax paid upon vesting of RSUs	$ 0	(432)	0	0	0	0	(432)
SERP transactions, net	0	218	0	28	0	0	246
Other	0	0	0	0	(1)	7	6
Balance at Sep. 30, 2018	$ 4,560	$ 130,166	$ (32,023)	$ (1,932)	$ 544,761	$ 742	$ 646,274
Balance (in shares) at Sep. 30, 2018	22,798