CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Parenthetical) (USD $) In Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME
Net gains (losses) on cash flow hedging instruments, deferred income taxes	$ (225)	$ (3,648)	$ (1,742)	$ (3,198)
Reclassification adjustment for losses on cash flow hedging instruments included in net income, deferred income taxes	0	(10)	0	(10)
Pension liability adjustments, deferred income taxes	(1,158)	(1,231)	947	(11,095)
Unrealized gain (loss) on marketable securities, deferred income taxes	2	6	2	1
Reclassification adjustment for gain on marketable securities, deferred income taxes			$ 0	$ 1