Summary of Significant Accounting Policies (Narrative) (Details)	12 Months Ended
	Dec. 31, 2013
Equipment and office facilities [Member] | Minimum [Member]
Significant Accounting Policies [Line Items]
Estimated useful life, Property, Plant and Equipment	5 years
Equipment and office facilities [Member] | Maximum [Member]
Significant Accounting Policies [Line Items]
Estimated useful life, Property, Plant and Equipment	10 years
Buildings [Member] | Minimum [Member]
Significant Accounting Policies [Line Items]
Estimated useful life, Property, Plant and Equipment	20 years
Buildings [Member] | Maximum [Member]
Significant Accounting Policies [Line Items]
Estimated useful life, Property, Plant and Equipment	40 years
Software [Member] | Minimum [Member]
Significant Accounting Policies [Line Items]
Estimated useful life, Software and certain costs incurred for purchasing or developing software	3 years
Software [Member] | Maximum [Member]
Significant Accounting Policies [Line Items]
Estimated useful life, Software and certain costs incurred for purchasing or developing software	5 years