Consolidated Statements of Stockholders' Equity (unaudited) (USD $) In Thousands	Common Stock [Member]	Additional Paid-in-Capital [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Common Stock in Treasury [Member]	Total
Beginning Balance at Dec. 31, 2013	$ 497	$ 574,152	$ 385,787	$ (16,765)	$ (127,102)	$ 816,569us-gaap_StockholdersEquity
Net income	0	0	18,009	0	0	18,009us-gaap_NetIncomeLoss
Cash dividends	0	0	(9,207)	0	0	(9,207)us-gaap_DividendsCash
Net issuance of shares to employee benefit plans and other stock plans, including tax benefit	0	(1,335)	0	0	1,697	362
Stock-based compensation	0	1,254	0	0	0	1,254
Other comprehensive (loss) income	0	0	0	5,215	0	5,215
Ending Balance at Mar. 31, 2014	497	574,071	394,589	(11,550)	(125,405)	832,202us-gaap_StockholdersEquity
Beginning Balance at Dec. 31, 2014	497	576,504	423,956	(17,027)	(119,749)	864,181us-gaap_StockholdersEquity
Net income	0	0	18,166	0	0	18,166us-gaap_NetIncomeLoss
Cash dividends	0	0	(9,282)	0	0	(9,282)us-gaap_DividendsCash
Net issuance of shares to employee benefit plans and other stock plans, including tax benefit	0	(2,564)	0	0	1,509	(1,055)
Stock-based compensation	0	1,988	0	0	0	1,988
Other comprehensive (loss) income	0	0	0	3,496	0	3,496
Ending Balance at Mar. 31, 2015	$ 497	$ 575,928	$ 432,840	$ (13,531)	$ (118,240)	$ 877,494us-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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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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- Definition

Value of stock (or other type of equity) issued during the period as a result of any equity-based compensation plan other than an employee stock ownership plan (ESOP), net of stock value of such awards forfeited. Stock issued could result from the issuance of restricted stock, the exercise of stock options, stock issued under employee stock purchase plans, and/or other employee benefit plans.

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