Employee Benefit Plans (Periodic Benefit Expense Net) (Details) (USD $) In Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010
Employee Benefit Plans [Abstract]
Service cost	$ 729	$ 511	$ 3,742	$ 1,322
Interest cost	301	337	952	1,148
Expected return on assets	(742)	(248)	(2,370)	(3,191)
Prior service costs	158	160	509	535
Settlement loss	2,887	894	2,887	2,486
Curtailment charges	326		2,039	1,347
Net periodic expense	$ 3,659	$ 1,654	$ 7,759	$ 3,647