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Supplemental Consolidated Financial Statement Information – Impact of Adoption of Topic 606 on Consolidated Statements of Operations and Comprehensive Loss (Details) - USD ($)
 3 Months Ended 12 Months Ended
May 01, 2018
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
Common stock dividend declared, percentage of shares outstanding 5.00%                      
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
Operating costs:                        
Operating expenses                   132,937,000 139,072,000 124,023,000
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)
Income tax benefit                   798,000 5,314,000 5,960,000
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 and diluted loss per share of common stock                     $ (1.40) $ (1.69)
Weighted average equivalent common shares outstanding - assuming dilution                   22,912,217 22,779,377 22,692,139
ASU 2014-09 | As Previously Reported                        
Operating revenues                     $ 157,148,000 $ 133,330,000
Operating costs:                        
Operating expenses                     139,164,000 121,661,000
Loss from operations                     (37,440,000) (49,436,000)
Income tax benefit                       6,449,000
Net loss                     $ (31,266,000) $ (39,792,000)
Basic and diluted loss per share of common stock                     $ (1.44) $ (1.84)
Weighted average equivalent common shares outstanding - assuming dilution                     21,694,645 21,611,562
ASU 2014-09 | Adjustments                        
Operating revenues                     $ (616,000) $ 4,310,000
Operating costs:                        
Operating expenses                     (92,000) 2,362,000
Loss from operations                     (524,000) 1,948,000
Income tax benefit                       (489,000)
Net loss                     $ (524,000) $ 1,459,000
Basic and diluted loss per share of common stock                     $ (0.03) $ 0.07
Stock Dividend Adjustments                        
Operating costs:                        
Basic and diluted loss per share of common stock                     $ 0.07 $ 0.08
Weighted average equivalent common shares outstanding - assuming dilution                     1,084,732 1,080,577