Retirement Plan 3 (Details) (Pension Plan [Member], USD $) In Thousands, unless otherwise specified	Dec. 31, 2011
Pension Plan [Member]
Future Pension Benefit Payments [Line Items]
For the first year	$ 147,108
For the second year	125,404
For the third year	126,052
For the fourth year	128,463
For the fifth year	130,009
For the years ending 12/31/15-12/31/19	666,672
Expected Future Benefit Payments Total	$ 1,323,708