Summary of Significant Accounting Policies (Details Textual) (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2011
Summary of Significant Accounting Policies (Textual) [Abstract]
Net Decrease in cash used in financing activities	$ 73,694
Net cash used in financing activities before revision	4,720,976
Net cash used in financing activities after revision	4,647,282
Cash provided by operating activities before revision	2,885,089
Cash provided by operating activities after revision	$ 2,811,395