Condensed Consolidated Statement of Equity (unaudited) - 6 months ended Jun. 30, 2017 - 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, 2016	$ 4,609	$ 139,970	$ (31,562)	$ (1,958)	$ 536,771	$ 1,011	$ 648,841
Balance (in shares) at Dec. 31, 2016	23,046
Net income	$ 0	0	0	0	29,540	(101)	29,439
Other comprehensive income	0	0	3,560	0	0	0	3,560
Change in ownership percentage of subsidiary	0	0	0	0	0	41	41
Dividends declared	0	5	0	0	(4,618)	0	(4,613)
Stock-based compensation	$ 0	1,200	0	0	0	0	1,200
Stock-based compensation (in shares)	0
Stock issued under incentive plans	$ 5	(5)	0	0	0	0	0
Stock issued under incentive plans (in shares)	23
Withholding tax paid upon vesting of RSUs	$ 0	(501)	0	0	0	0	(501)
SERP transactions, net	0	162	0	(3)	0	0	159
Other	0	0	0	0	0	183	183
Balance at Jun. 30, 2017	$ 4,614	$ 140,831	$ (28,002)	$ (1,961)	$ 561,693	$ 1,134	$ 678,309
Balance (in shares) at Jun. 30, 2017	23,069