Fair Value Measurement Schedule Of Estimated Fair Value Hierarchy Of Investments And Related Impairments Recognized (Details) (USD $)	6 Months Ended	12 Months Ended
	Jun. 30, 2013	Dec. 31, 2012
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total cost method investments, Total at Estimated Fair Value	$ 31,486	$ 36,406
Total cost method investments, Impairment Losses	(34,070)	(6,504)
Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total cost method investments, Total at Estimated Fair Value	0	0
Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total cost method investments, Total at Estimated Fair Value	0	0
Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total cost method investments, Total at Estimated Fair Value	31,486	36,406
Cost Method Investments
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Valuation Method	Fair Value	Fair Value
Impaired	Yes	Yes
Total cost method investments, Total at Estimated Fair Value	31,486	36,406
Total cost method investments, Impairment Losses	(34,070)	(6,504)
Cost Method Investments | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total cost method investments, Total at Estimated Fair Value	0	0
Cost Method Investments | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total cost method investments, Total at Estimated Fair Value	0	0
Cost Method Investments | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total cost method investments, Total at Estimated Fair Value	$ 31,486	$ 36,406