Employee Benefits Plans (Net Periodic Pension Cost (Credit) And Other Amounts Recognized In Other Comprehensive Loss (Income)) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Employee Benefit Plans [Abstract]
Service cost	$ 3,059	$ 1,864	$ 1,445
Interest cost	1,225	1,479	4,823
Expected return on assets	(3,038)	(4,243)	(9,434)
Prior service costs	649	695	709
Amortization of loss			1,015
Settlement loss	3,698	2,791	46,042
One-time charge in connection with an increase in benefits for certain participants	1,401
Curtailment charges	2,173	1,346
Net periodic pension cost	9,167	3,932	44,600
Prior service (cost) credit	(769)	(282)	(710)
Loss (gain)	(2,531)	(2,368)	(44,202)
Total recognized in other comprehensive loss (income)	(3,300)	(2,650)	(44,912)
Total recognized in net periodic pension cost and other comprehensive loss (income)	$ 5,867	$ 1,282	$ (312)