Annual report pursuant to Section 13 and 15(d)

Unaudited Quarterly Information (Unaudited) (Details)

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Unaudited Quarterly Information (Unaudited) (Details) (USD $)
3 Months Ended 12 Months Ended
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Quarterly Financial Information Disclosure [Abstract]                      
Net revenues $ 176,134,000 $ 161,649,000 $ 126,253,000 $ 110,136,000 $ 156,591,000 $ 163,906,000 $ 164,100,000 $ 146,573,000 $ 574,171,249 $ 631,170,565 $ 728,200,318
Gross Profit 28,359,000 30,064,000 23,383,000 21,519,000 32,963,000 34,802,000 31,158,000 29,224,000 103,324,539 128,147,277 135,046,147
Net income $ 1,574,000 $ 4,545,000 $ (1,781,000) $ (1,924,000) $ 5,094,000 $ 6,712,000 $ 4,819,000 $ 1,735,000 $ 2,414,187 $ 18,360,133 $ 33,412,933
Net income per share attributable to common shareholders:                      
Basic (in usd per share) $ 0.03 $ 0.10 $ (0.04) $ (0.04) $ 0.11 $ 0.15 $ 0.11 $ 0.04 $ 0.05 $ 0.41 $ 0.78
Diluted (in usd per share) $ 0.03 $ 0.10 $ (0.04) $ (0.04) $ 0.11 $ 0.15 $ 0.10 $ 0.04 $ 0.05 $ 0.40 $ 0.75
Weighted average common shares outstanding:                      
Basic (in shares) 45,819,906 45,621,552 45,465,529 45,327,237 45,116,164 44,788,160 44,541,025 44,145,093 45,560,078 44,649,275 42,587,818
Diluted (in shares) 46,649,171 46,605,360 45,465,529 46,220,748 46,508,767 46,247,239 46,359,323 46,128,417 46,419,199 45,995,463 44,707,132