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Consolidated Statements of Equity (USD $) In Thousands	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Total
Balances at Dec. 31, 2011	$ 5,128	$ 2,544	$ 223,136	$ (16,044)	$ 214,764us-gaap_StockholdersEquity
Net income			28,203		28,203us-gaap_NetIncomeLoss
Other comprehensive loss				(238)	(238)
Issuance of treasury shares	2	149	27		178
Cash dividends - a share			(8,188)		(8,188)us-gaap_DividendsCommonStockCash
Balances at Dec. 31, 2012	5,130	2,693	243,178	(16,282)	234,719us-gaap_StockholdersEquity
Net income			30,104		30,104us-gaap_NetIncomeLoss
Other comprehensive loss				7,821	7,821
Issuance of treasury shares	1	129	28		158
Cash dividends - a share			(8,662)		(8,662)us-gaap_DividendsCommonStockCash
Balances at Dec. 31, 2013	5,131	2,822	264,648	(8,461)	264,140us-gaap_StockholdersEquity
Net income			36,141		36,141us-gaap_NetIncomeLoss
Other comprehensive loss				(8,865)	(8,865)
Issuance of treasury shares	2	237	27		266
Cash dividends - a share			(9,715)		(9,715)us-gaap_DividendsCommonStockCash
Balances at Dec. 31, 2014	$ 5,133	$ 3,059	$ 291,101	$ (17,326)	$ 281,967us-gaap_StockholdersEquity

The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

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- Definition

Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which are attributable to the parent. The amount of the economic entity's stockholders' equity attributable to the parent excludes the amount of stockholders' equity which is allocable to that ownership interest in subsidiary equity which is not attributable to the parent (noncontrolling interest, minority interest). This excludes temporary equity and is sometimes called permanent equity.

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