Retirement Plans (Weighted-Average Asset Allocation for the Defined Benefit Cash Balance Plan) (Details) |
Dec. 31, 2015 |
Dec. 31, 2014 |
|---|---|---|
| Defined Benefit Plan Disclosure [Line Items] | ||
| Defined benefit plan, actual plan asset allocations | 100.00% | 100.00% |
| Debt Securities [Member] | ||
| Defined Benefit Plan Disclosure [Line Items] | ||
| Defined benefit plan, actual plan asset allocations | 33.00% | 33.00% |
| Equity Securities [Member] | ||
| Defined Benefit Plan Disclosure [Line Items] | ||
| Defined benefit plan, actual plan asset allocations | 64.00% | 64.00% |
| Other Liabilities [Member] | ||
| Defined Benefit Plan Disclosure [Line Items] | ||
| Defined benefit plan, actual plan asset allocations | 3.00% | 3.00% |