Consolidated Statements of Changes in Equity (USD $) In Thousands	Total	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Noncontrolling Interest [Member]
Balance at at Dec. 31, 2011	$ 261,357	$ 12,912	$ 89,725	$ 180,710	$ (28,967)	$ 6,977
Net income	50,240	0	0	47,405	0	2,835
Other Comprehensive Income (Loss), Net of Tax	(13,025)	0	0	0	(12,888)	(137)
Dividends Common Stock	(12,725)	0	0	(12,725)	0	0
Distributions to noncontrolling affiliate shareholders	(1,099)	0	0	0	0	(1,099)
Shares issued upon exercise of stock options and other	(1,194)	102	(1,296)	0	0	0
Shares issued for empoyee stock purchase plan	270	7	263	0	0	0
Equity-based compensation plans	3,807	74	3,733	0	0	0
Excess tax benefit from stock option exercises	2,045	0	2,045	0	0	0
Balance at at Dec. 31, 2012	289,676	13,095	94,470	215,390	(41,855)	8,576
Net income	58,851	0	0	56,339	0	2,512
Adjustment to Prior Period earnings	335	0	0	(335)	0	0
Other Comprehensive Income (Loss), Net of Tax	5,849	0	0	0	7,155	(1,306)
Dividends Common Stock	(13,109)	0	0	(13,109)	0	0
Distributions to noncontrolling affiliate shareholders	(905)	0	0	0	0	(905)
Shares issued upon exercise of stock options and other	(644)	24	(668)	0	0	0
Shares issued for empoyee stock purchase plan	337	6	331	0	0	0
Equity-based compensation plans	4,161	71	4,090	0	0	0
Excess tax benefit from stock option exercises	815	0	815	0	0	0
Balance at at Dec. 31, 2013	344,696	13,196	99,038	258,285	(34,700)	8,877
Net income	58,297	0	0	56,492	0	1,805
Other Comprehensive Income (Loss), Net of Tax	(19,943)	0	0	0	(19,706)	(237)
Dividends Common Stock	(15,253)	0	0	(15,253)	0	0
Distributions to noncontrolling affiliate shareholders	(1,806)	0	0	0	0	(1,806)
Acqusition of Noncontrolling Interest, net	(7,422)	0	(6,443)	0	0	(979)
Shares issued upon exercise of stock options and other	388	19	369	0	0	0
Shares issued for empoyee stock purchase plan	416	6	410	0	0	0
Equity-based compensation plans	5,309	80	5,229	0	0	0
Excess tax benefit from stock option exercises	453	0	453	0	0	0
Balance at at Dec. 31, 2014	$ 365,135	$ 13,301	$ 99,056	$ 299,524	$ (54,406)	$ 7,660