Employee Benefit Plans (Expected long-term return by asset category) (Details)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012
Expected Long Term Return [Abstract]
Expected long-term return	5.90%	5.60%
Assets allocation [Abstract]
Assets allocation	100.00%
Cash and Cash Equivalents [Member]
Expected Long Term Return [Abstract]
Expected long-term return	0.50%
Assets allocation [Abstract]
Assets allocation	2.00%
Equity Securities [Member]
Expected Long Term Return [Abstract]
Expected long-term return	7.30%
Assets allocation [Abstract]
Assets allocation	47.00%
Debt Securities [Member]
Expected Long Term Return [Abstract]
Expected long-term return	4.10%
Assets allocation [Abstract]
Assets allocation	39.00%
Target Return Funds [Member]
Expected Long Term Return [Abstract]
Expected long-term return	7.30%
Assets allocation [Abstract]
Assets allocation	12.00%