Pension Plan (Details) - Weighted average asset allocations by asset category	Dec. 31, 2013	Dec. 31, 2012
Pension Plan (Details) - Weighted average asset allocations by asset category [Line Items]
Total pension plan assets	100.00%	100.00%
Guaranteed. Investment Contracts [Member]
Pension Plan (Details) - Weighted average asset allocations by asset category [Line Items]
Total pension plan assets	22.90%	31.80%
Mutual Stock Funds [Member]
Pension Plan (Details) - Weighted average asset allocations by asset category [Line Items]
Total pension plan assets	19.40%	17.20%
Equity And Index Funds [Member]
Pension Plan (Details) - Weighted average asset allocations by asset category [Line Items]
Total pension plan assets	57.70%	51.00%