Summary of Significant Accounting Policies Deconsolidation of Subsidiary (Details) (USD $)	12 Months Ended
	Dec. 31, 2012
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]
Consideration from third party deconsolidation of subsidiary	$ 400,000
Deconsolidation of noncontrolling interests	40,086,000
Noncontrolling Interests
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]
Deconsolidation of noncontrolling interests	$ 40,086,000