Employee Benefit Plans Projected Benefit Obligation (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011		Dec. 31, 2010		Dec. 31, 2009
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value on plan assets, end of year	$ 55,102		$ 57,011
Other Postretirement Benefit Plans, Defined Benefit [Member]
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Accumulated postretirement benefit obligation, beginning of year	8,345	[1]	9,132
Service cost	201		190		211
Interest cost	428		441		485
Benefit payments	(363)		(406)
Experiencet (gains) loss	(305)		(796)
Defined Benefit Plan Change In Assumptions	1,345		(216)
Accumulated postretirement benefit obligation, end of year	9,651	[1]	8,345	[1]	9,132
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value on plan assets, beginning of year	105		110
Employer contributions	333		401
Actual return on assets	0		0
Benefit payments	(363)		(406)
Fair value on plan assets, end of year	75		105		110
Pension Plans, Defined Benefit [Member]
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Projected benefit obligation, beginning of year	63,460	[1]	61,997
Service cost	60	[2]	104	[2]	153	[2]
Interest cost	3,412		3,367		3,282
Benefit payments	(2,309)		(2,490)
Experiencet (gains) loss	(220)		370
Change Due to Change In Assumptions	12,652		112
Projected benefit obligation, end of year	77,055	[1]	63,460	[1]	61,997
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value on plan assets, beginning of year	57,011		54,597
Actual return on assets	400		4,904
Benefit payments	(2,309)		(2,490)
Fair value on plan assets, end of year	$ 55,102		$ 57,011		$ 54,597

[1] As a result of the Pension Plan’s curtailment, the accumulated benefit obligation is equal to the projected benefit obligation as of December 31, 2011 and 2010.

[2] Pension plan service cost for all years presented was related to administrative costs associated with the plan and not due to the accrual of additional participant benefits.