Quarterly report pursuant to Section 13 or 15(d)

Geographic Information (Details)

v2.4.0.6
Geographic Information (Details) (USD $)
 3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Dec. 31, 2011
Revenues from External Customers and Long-Lived Assets [Line Items]          
Assets $ 660,675,789 $ 660,579,017 $ 660,675,789 $ 660,579,017 $ 645,597,467
Revenue 164,099,905 165,481,943 310,673,274 311,901,712  
United States [Member]
          
Revenues from External Customers and Long-Lived Assets [Line Items]          
Assets 601,812,574   601,812,574   576,695,791
Revenue 150,823,316 137,725,505 278,257,725 259,343,735  
Canada [Member]
          
Revenues from External Customers and Long-Lived Assets [Line Items]          
Assets 58,479,009   58,479,009   68,321,537
Revenue 10,656,174 27,118,981 28,291,806 51,827,380  
Other [Member]
          
Revenues from External Customers and Long-Lived Assets [Line Items]          
Assets 384,206   384,206   580,139
Revenue $ 2,620,415 $ 637,457 $ 4,123,743 $ 730,597