Annual report pursuant to Section 13 and 15(d)

Summary of Significant Accounting Policies Summary of Significant Accounting Policies - Comrehensive Income Restatement (Details)

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Summary of Significant Accounting Policies Summary of Significant Accounting Policies - Comrehensive Income Restatement (Details) (USD $)
 3 Months Ended 12 Months Ended
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2011
Sep. 30, 2011
Jun. 30, 2011
Mar. 31, 2011
Dec. 31, 2010
Sep. 30, 2010
Jun. 30, 2010
Mar. 31, 2010
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Statements of Comprehensive Income Data:                              
Net income $ 5,094 $ 6,712 $ 4,819 $ 1,735 $ 8,443 $ 11,023 $ 8,390 $ 5,557 $ 8,883 $ 11,300 $ 6,554 $ 778 $ 18,360,133 $ 33,412,933 $ 27,513,666
Other comprehensive income (loss):                              
Unrealized (loss) gain from interest rate hedge, net of tax                         (666,563) (3,135,402) 278,571
Foreign currency translation adjustment                         722,072 (970,884) 1,653,430
Total other comprehensive income (loss)                         55,509 (4,106,286) 1,932,001
Comprehensive income                         18,415,642 29,306,647 29,445,667
As Reported
                              
Statements of Comprehensive Income Data:                              
Net income   6,771 5,169 1,505 8,248 12,359 8,832 5,288 7,700 12,041 7,708 1,278   34,726,520 28,726,116
Other comprehensive income (loss):                              
Unrealized (loss) gain from interest rate hedge, net of tax                           (4,448,989) (933,879)
Foreign currency translation adjustment                           (970,884) 1,653,430
Total other comprehensive income (loss)                           (5,419,873) 719,551
Comprehensive income                           29,306,647 29,445,667
Adjustment
                              
Statements of Comprehensive Income Data:                              
Net income   (59) (350) 230 195 (1,336) (442) 269 1,183 (741) (1,154) (500)   (1,313,587) (1,212,450)
Other comprehensive income (loss):                              
Unrealized (loss) gain from interest rate hedge, net of tax                           1,313,587 1,212,450
Foreign currency translation adjustment                           0 0
Total other comprehensive income (loss)                           1,313,587 1,212,450
Comprehensive income                           $ 0 $ 0