CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (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
Net gains on cash flow hedging instruments, deferred income taxes	$ (680)	$ (225)	$ (895)	$ (1,742)
Pension liability adjustments, deferred income taxes	(2,118)	(1,158)	(1,325)	947
Unrealized gain (loss) on marketable securities, deferred income taxes	$ 3	$ 2	$ (1)	$ 2