Condensed Consolidated Statements of Comprehensive Income (USD $) In Thousands, unless otherwise specified	3 Months Ended
Mar. 31, 2013	Mar. 31, 2012
Statement of Other Comprehensive Income [Abstract]
Net earnings	$ 16,632	$ 19,741
Unrealized gains (losses) on securities:
Net unrealized holding gains arising during period	(1,125)	7,752
Net unrealized liquidity gains (losses)	138	(24)
Reclassification adjustment for net amounts included in net earnings	(1,359)	(1,040)
Amortization of net unrealized (gains) losses related to transferred securities	0	1
Net unrealized gains (losses) on securities	(2,346)	6,689
Foreign currency translation adjustments	590	386
Benefit plans:
Amortization of net prior service cost and net gain (loss)	381	223
Other comprehensive income	(1,375)	7,298
Comprehensive income	$ 15,257	$ 27,039

The change in equity [net assets] of a business enterprise during a period from transactions and other events and circumstances from non-owner sources which are attributable to the reporting entity. It includes all changes in equity during a period except those resulting from investments by owners and distributions to owners, but excludes any and all transactions which are directly or indirectly attributable to that ownership interest in subsidiary equity which is not attributable to the parent.

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