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Quarterly Consolidated Financial Data (Unaudited) (Details) - USD ($) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2015 | Sep. 30, 2014 | Sep. 30, 2013
Quarterly Consolidated Financial Data (Unaudited) |  |  |  |  |  |  |  |  |  |  |  |
Operating revenues | $ 55,130,000 | $ 62,498,000 | $ 43,335,000 | $ 73,722,000 | $ 50,802,000 | $ 62,570,000 | $ 54,166,000 | $ 76,766,000 | $ 68,181,000 | $ 234,685,000 | $ 261,683,000 | $ 305,299,000
(Loss) income from operations | (8,141,000) | (4,662,000) | (18,065,000) | (9,814,000) | (6,984,000) | (6,531,000) | (9,228,000) | 2,822,000 | (4,967,000) | (40,682,000) | (17,904,000) | 20,180,000
Net (loss) income | $ (4,940,000) | $ (2,870,000) | $ (11,877,000) | $ (6,592,000) | $ (4,991,000) | $ (3,882,000) | $ (7,493,000) | $ 1,652,000 | $ (2,897,000) | $ (26,279,000) | $ (12,620,000) | $ 10,480,000
Basic (loss) income per share attributable to common stock | $ (0.23) | $ (0.13) | $ (0.55) | $ (0.37) | $ (0.36) | $ (0.28) | $ (0.54) | $ 0.12 | $ (0.20) | $ (1.27) | $ (0.90) | $ 0.75
Diluted (loss) income per share attributable to common stock | $ (0.23) | $ (0.13) | $ (0.55) | $ (0.37) | $ (0.36) | $ (0.28) | $ (0.54) | $ 0.12 | $ (0.20) | $ (1.27) | $ (0.90) | $ 0.74
Merger conversion factor (in shares) |  |  |  |  |  |  |  |  |  | 1.76 |  |

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