Pension, Postretirement And Postemployment Benefits (Details Textual) (USD $)	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Pension Postretirement and Postemployment Benefits (Textual) [Abstract]
Contribution to defined contribution plans	$ 22,900,000	$ 13,600,000
Pension Plans, Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Net actuarial loss included in accumulated other comprehensive income (loss)	(12,100,000)	(6,700,000)	(6,300,000)
Prior service costs relating to pension costs included in accumulated other comprehensive income (loss)	0	0	0
Transition obligation related to pension cost included in accumulated other comprehensive income (loss)	0	0	0
Amount expected to recognize as a components of net periodic benefit costs	1,000,000
Equity securities investment target allocation percentage	55.00%
Debt securities investment target allocation percentage	45.00%
Contribution to defined benefit pool pension plan	1,312,000	439,000
Expected Contribution to defined benefit pool pension plan in 2011	1,500,000
Defined benefit plan terminated, obligation	(10,307,000)	(5,409,000)
Other Postretirement Benefit Plans, Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan terminated, obligation	$ 200,000	$ 200,000