Retirement Plans (Asset Allocations) (Details)	Dec. 31, 2014	Dec. 31, 2013
Asset category [Abstract]
Weighted average asset allocation (in hundreths)	100.00%	100.00%
Equity Securities [Member]
Asset category [Abstract]
Weighted average asset allocation (in hundreths)	45.00%	42.00%
Alternative Investments [Member]
Asset category [Abstract]
Weighted average asset allocation (in hundreths)	6.00%	13.00%
Debt Securities [Member]
Asset category [Abstract]
Weighted average asset allocation (in hundreths)	47.00%	44.00%
Cash and Cash Equivalents [Member]
Asset category [Abstract]
Weighted average asset allocation (in hundreths)	2.00%	1.00%