Accounting for the Impairment or Disposal of Long-Lived Assets - Impairment (Details) (USD $)	3 Months Ended	9 Months Ended	3 Months Ended	9 Months Ended
	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2012 Northeast Southeastern PA [Member]	Sep. 30, 2011 Central Region [Member]
Impaired Long-Lived Assets Held and Used [Line Items]
Impairment charges	$ 0	$ 2,323,524	$ 1,729,144	$ 4,700,000