CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Parenthetical) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Other comprehensive income (loss):
Reclassification adjustment for write-down of marketable securities included in net earnings, tax	$ 348	$ 0	$ 0
Reclassification adjustment for gain on sale of marketable securities included in net earnings (loss), tax	0	(45)	0
Unrealized holding losses on marketable securities arising during the period, tax	(154)	(310)	280
Change in unfunded SERP liability, tax	$ (210)	$ (306)	$ (294)

Tax effect of the increase (decrease) in the value of the projected benefit obligation and the (increase) decrease in the value of the plan assets resulting from experience different from that assumed or from a change in an actuarial assumption that has not been recognized in net periodic benefit cost.

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Tax effect of the income statement impact of the reclassification adjustment for unrealized gain (loss) realized upon the sale of available-for-sale securities.

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- Definition

Tax effect of the income statement impact of the reclassification adjustment for unrealized (losses) realized upon the write-down of available-for-sale securities.

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- Definition

Tax effect of unrealized holding gain (loss) before reclassification adjustments and transfers on available-for-sale securities.

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