Comprehensive Income (Loss) Accumulated Other Comprehensive Loss (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Accumulated other comprehensive income (loss) total, period start			$ (32,878)	$ (23,581)
Other comprehensive income (loss), net of tax	(608)	288	(774)	(1,290)
Accumulated other comprehensive income (loss) total, period end	(33,652)	(24,871)	(33,652)	(24,871)
Cash Flow Hedging [Member]
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Accumulated other comprehensive income (loss) total, period start			(13,802)	(12,439)
Other comprehensive income (loss), net of tax			(774)	(1,290)
Accumulated other comprehensive income (loss) total, period end	(14,576)	(13,729)	(14,576)	(13,729)
Accumulated Defined Benefit Plans Adjustment [Member]
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Accumulated other comprehensive income (loss) total, period start			(19,076)	(11,142)
Other comprehensive income (loss), net of tax			0	0
Accumulated other comprehensive income (loss) total, period end	$ (19,076)	$ (11,142)	$ (19,076)	$ (11,142)