CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Parenthetical) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Net gains on cash flow hedging instruments, deferred income taxes	$ 242	$ (2,107)	$ (653)	$ (3,849)
Pension liability adjustments, deferred income taxes	1,514	(3,691)	189	(2,744)
Unrealized gain (loss) on marketable securities, deferred income taxes	$ (1)	$ 7	$ (2)	$ 9