Concentration, Credit and Other Risks (Narrative) (Details)	12 Months Ended
	Dec. 31, 2015
Concentration, Credit And Other Risks 1	10.00%
Concentration, Credit And Other Risks 2	10.00%
Concentration, Credit And Other Risks 3	10.00%
Concentration, Credit And Other Risks 4	10.00%
Concentration, Credit And Other Risks 5	10.00%
Concentration, Credit And Other Risks 6	10.00%
Concentration, Credit And Other Risks 7	10.00%
Concentration, Credit And Other Risks 8	10.00%
Concentration, Credit And Other Risks 9	10.00%
Concentration, Credit And Other Risks 10	10.00%