CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) (Unaudited) (Parenthetical) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Other comprehensive (loss) income, tax:
Reclassification adjustment for write-down of marketable securities included in net earnings, tax	$ 181	$ 0	$ 181	$ 0
Reclassification adjustment for gain on sale of marketable securities included in net earnings (loss), tax	0	(45)	0	(45)
Unrealized holding gains on marketable securities arising during the period, tax	(72)	(210)	(59)	(71)
Change in unfunded SERP liability, tax	$ 18	$ 0	$ 35	$ 0