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Condensed Consolidated Statements of Comprehensive Income (unaudited) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Condensed Consolidated Statements of Comprehensive Income (unaudited) [Abstract]
Net earnings	$ 9,972	$ 9,572	$ 19,240	$ 18,484
Other comprehensive income (loss), net of tax:
Net foreign currency translation adjustment	(792)	217	(409)	818
Net change in postretirement benefit plan, net of taxes of $1 and $1 for the three months ended June 30, 2012 and 2011, and $3 and $1 for the six months ended June 30, 2012 and 2011	(4)	(1)	(12)	(3)
Other comprehensive (loss) income	(796)	216	(421)	815
Comprehensive income	$ 9,176	$ 9,788	$ 18,819	$ 19,299

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- Definition

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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