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CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY (Unaudited) - USD ($) $ in Thousands	Common Stock [Member]	Capital in Excess of Par Value [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Treasury Stock [Member]	Total
Balance at Dec. 31, 2015	$ 47,872	$ 93,247	$ 291,481	$ (6,474)	$ (34,147)	$ 391,979
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net earnings	0	0	52,078	0	0	52,078
Other comprehensive income (loss), net of tax	0	0	0	160	0	160
Cash dividends paid	0	0	(11,566)	0	0	(11,566)
Purchase of treasury stock	0	0	0	0	(377)	(377)
Stock-based compensation and related tax benefits	0	3,544	0	0	700	4,244
Employee Stock Ownership Plan	0	455	0	0	1,566	2,021
Balance at Sep. 30, 2016	47,872	97,246	331,993	(6,314)	(32,258)	438,539
Balance at Jun. 30, 2016				(6,231)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net earnings						20,630
Other comprehensive income (loss), net of tax						(83)
Balance at Sep. 30, 2016	$ 47,872	$ 97,246	$ 331,993	$ (6,314)	$ (32,258)	$ 438,539

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This element represents the amount of recognized equity-based compensation during the period, that is, the amount recognized as expense in the income statement (or as asset if compensation is capitalized). Alternate captions include the words "stock-based compensation".

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Value of shares committed to be released under an Employee Stock Ownership Plan (ESOP).

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Amount of paid and unpaid common stock dividends declared with the form of settlement in cash.

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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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No definition available.

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

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Amount after tax of other comprehensive income (loss) attributable to parent entity.

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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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Equity impact of the cost of common and preferred stock that were repurchased during the period. Recorded using the cost method.

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