Employee and Retiree Benefit Plans (Benefit Payments, Reflected Expected Future Service as Appropriate which are Expected to be Paid in Future Years from Assets of Plans or by Company) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014
Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
2015	$ 33,516
2016	34,212
2017	35,144
2018	36,439
2019	37,671
2020-2024	208,294
Other Postretirement Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
2015	6,349
2016	6,573
2017	6,730
2018	6,943
2019	7,225
2020-2024	$ 40,535

Employee and Retiree Benefit Plans (Benefit Payments, Reflected Expected Future Service as Appropriate which are Expected to be Paid in Future Years from Assets of Plans or by Company) (Details) (USD $)
In Thousands, unless otherwise specified

Dec. 31, 2014

Defined Benefit Plan Disclosure [Line Items]

2015