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Quarterly Financial Data (Impact of Error Correction on Calculation of Diluted Earnings Per Share) (Details) - USD ($) | 3 Months Ended | 6 Months Ended | 9 Months Ended | 12 Months Ended
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Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Jun. 30, 2014 | Sep. 30, 2014 | Dec. 31, 2015 | Dec. 31, 2014
Earnings Per Share, Basic | $ (0.54) | $ (0.30) | $ 1.27 | $ (3.49) | $ (0.25) | $ 3.87 | $ 2.56 | $ (3.18) | $ 0.47 | $ 4.37 | $ (1.99) | $ 4.21
Earnings Per Share, Diluted | $ (0.54) | $ (0.30) | $ (0.33) | $ (3.49) | $ (0.44) | $ (0.86) | $ (0.63) | $ (3.18) | $ (1.06) | $ (1.96) | $ (1.99) | $ (2.33)
Net income (loss), basic | $ (3,180,000) | $ (1,724,000) | $ 7,225,000 | $ (14,831,000) | $ (994,000) | $ 14,493,000 | $ 9,389,000 | $ (11,621,000) | $ 1,732,000 | $ 16,115,000 | $ (10,794,000) | $ 15,757,000
Net income (loss), diluted |  |  | $ (2,482,000) |  |  | $ (4,966,000) | $ (3,742,000) |  | $ (6,277,000) | $ (11,509,000) | $ (10,794,000) | $ (13,717,000)
Weighted average number of shares of common stock outstanding - diluted |  |  | 7,545,487 |  |  | 5,786,904 | 5,906,025 |  | 5,928,818 | 5,884,263 | 5,411,204 | 5,886,730
Scenario, Previously Reported [Member] |  |  |  |  |  |  |  |  |  |  |  |
Earnings Per Share, Basic |  |  | $ 1.58 |  |  | $ 5.58 | $ 3.69 |  | $ 0.53 | $ 6.19 |  | $ 5.82
Earnings Per Share, Diluted |  |  | $ 1.17 |  |  | $ 3.30 | $ 2.09 |  | $ 0.30 | $ 3.53 |  | $ 3.37
Net income (loss), basic |  |  | $ 8,941,000 |  |  | $ 20,884,000 | $ 13,555,000 |  | $ 1,934,000 | $ 22,818,000 |  | $ 21,824,000
Weighted average number of shares of common stock outstanding - diluted |  |  | 7,658,556 |  |  | 6,319,802 | 6,497,619 |  | 6,514,181 | 6,472,093 |  | 6,472,093
Restatement Adjustment [Member] |  |  |  |  |  |  |  |  |  |  |  |
Earnings Per Share, Basic |  |  | $ (0.31) |  |  | $ (1.71) | $ (1.13) |  | $ (0.06) | $ (1.82) |  | $ (1.61)
Earnings Per Share, Diluted |  |  | $ (1.50) |  |  | $ (4.16) | $ (2.72) |  | $ (1.36) | $ (5.49) |  | $ (5.70)
Net income (loss), basic |  |  | $ (1,716,000) |  |  | $ (6,391,000) | $ (4,166,000) |  | $ (202,000) | $ (6,703,000) |  | $ (6,067,000)
Net income (loss), diluted |  |  | $ (9,707,000) |  |  | $ (19,459,000) | $ (13,131,000) |  | $ (8,009,000) | $ (27,624,000) |  | $ (29,474,000)
Weighted average number of shares of common stock outstanding - diluted |  |  | (113,069) |  |  | (532,898) | (591,594) |  | (585,363) | (587,830) |  | (585,363)
Series B Convertible Preferred Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |
Weighted average number of shares of common stock outstanding - diluted |  |  |  |  |  |  |  |  |  |  |  | 1,748,288

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