Basis of Consolidation Policy Additional Information (Details)	3 Months Ended	6 Months Ended
	Jun. 30, 2013	Jun. 30, 2013
Maximum [Member]
Ownership Interest to be Held for Consolidation [Line Items]
Ownership Interest To Use Equity Method		50.00%
Ownership Interest To Use Cost Method		20.00%
Minimum [Member]
Ownership Interest to be Held for Consolidation [Line Items]
Ownership Interest to be Held for Consolidation	50.00%	50.00%
Ownership Interest to be Held for Consolidation - Noncontrolling Interests	50.00%	50.00%