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CONSOLIDATED STATEMENTS OF EARNINGS (USD $)
 3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
CONSOLIDATED STATEMENTS OF EARNINGS        
Revenue $ 21,115,045 $ 41,834,680 $ 115,806,689 $ 139,264,045
Cost and expenses        
Cost of services 18,492,618 30,918,343 90,011,820 94,477,345
Selling, general and administrative 2,391,946 2,134,408 7,226,433 6,484,735
Depreciation and amortization expense 6,057,092 6,685,698 19,110,476 18,591,209
Total cost and expenses 26,941,656 39,738,449 116,348,729 119,553,289
Income (loss) from operations (5,826,611) 2,096,231 (542,040) 19,710,756
Interest expense 275,509 350,366 903,667 873,004
Income (loss) before income taxes (6,102,120) 1,745,865 (1,445,707) 18,837,752
Income tax expense (benefit) (2,150,433) 634,223 158,537 7,315,971
NET INCOME (LOSS) $ (3,951,687) $ 1,111,642 $ (1,604,244) $ 11,521,781
Earnings per common share:        
Basic (in dollars per share) $ (0.18) $ 0.05 $ (0.07) $ 0.54
Diluted (in dollars per share) $ (0.18) $ 0.05 $ (0.07) $ 0.53
Weighted average number of common shares outstanding:        
Basic (in shares) 21,832,831 21,594,401 21,805,692 21,455,601
Diluted (in shares) 21,832,831 21,922,926 21,805,692 21,855,940