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Quarterly Consolidated Financial Data (Unaudited) (Details) - USD ($)
 3 Months Ended 12 Months Ended
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Quarterly Consolidated Financial Data (Unaudited)                      
Operating revenues $ 27,670,000 $ 40,448,000 $ 36,158,000 $ 49,880,000 $ 37,418,000 $ 45,108,000 $ 31,640,000 $ 42,366,000 $ 154,156,000 $ 156,532,000 $ 137,640,000
Loss from operations (11,862,000) (5,234,000) (6,291,000) (1,640,000) (6,022,000) (4,299,000) (15,504,000) (12,139,000) (25,027,000) (37,964,000) (47,488,000)
Net loss $ (11,816,000) $ (5,171,000) $ (5,711,000) $ (1,709,000) $ (4,788,000) $ (2,922,000) $ (14,928,000) $ (9,152,000) $ (24,407,000) $ (31,790,000) $ (38,333,000)
Basic loss per share of common stock $ (0.51) $ (0.23) $ (0.25) $ (0.07) $ (0.21) $ (0.13) $ (0.66) $ (0.40) $ (1.07) $ (1.40) $ (1.69)
Diluted loss per share of common stock $ (0.51) $ (0.23) $ (0.25) $ (0.07) $ (0.21) $ (0.13) $ (0.66) $ (0.40) $ (1.07) $ (1.40) $ (1.69)