Employee Benefit Plans Defined Benefit Plan - Asset Allocation (Details) (Qualified Pension)	Dec. 31, 2014
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Asset allocation for Company's qualified plan assets	100.00%
Cash and cash equivalents
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Asset allocation for Company's qualified plan assets	0.40%	[1]
Equity securities
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Asset allocation for Company's qualified plan assets	68.30%	[2]
Fixed income securities
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Asset allocation for Company's qualified plan assets	31.30%
Represented Employees
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Asset allocation for Company's qualified plan assets	100.00%
Represented Employees | Cash and cash equivalents
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Asset allocation for Company's qualified plan assets	0.40%	[1]
Represented Employees | Equity securities
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Asset allocation for Company's qualified plan assets	74.90%	[2]
Represented Employees | Fixed income securities
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Asset allocation for Company's qualified plan assets	24.70%
Non-represented Employees
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Asset allocation for Company's qualified plan assets	100.00%
Non-represented Employees | Cash and cash equivalents
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Asset allocation for Company's qualified plan assets	0.60%	[1]
Non-represented Employees | Equity securities
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Asset allocation for Company's qualified plan assets	31.30%	[2]
Non-represented Employees | Fixed income securities
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Asset allocation for Company's qualified plan assets	68.10%

[1] Cash and cash equivalents at December 31, 2014 include amounts pending settlement from the purchase or sale of equity or fixed income securities.

[2] Equity securities at December 31, 2014 include amounts held in hedged equity funds which primarily invest using a "fund of funds" strategy in multiple other equity funds.