Annual report pursuant to Section 13 and 15(d)

Income Taxes - Narrative (Details)

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Income Taxes - Narrative (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
Tax Credit Carryforward [Line Items]                      
Deferred tax assets, increase in valuation allowance                 $ 42,731,000    
Increase (decrease) in valuation allowance affecting income tax expense                 52,916,000 $ 39,499,000 $ 26,892,000
Net operating loss $ 316,590,000 $ (12,280,000) $ 201,845,000 $ (12,012,000) $ (14,647,000) $ (12,896,000) $ 11,848,000 $ (16,609,000) 494,143,000 (32,304,000) $ (67,649,000)
Operating loss carryforwards, limitation as per IRC 129,521,000               129,521,000    
Alternative minimum tax credit carryforwards 426,000               426,000    
Accrued interest and penalties related to uncertain tax positions 143,000               143,000    
Expected increase in uncertain tax position in next twelve months 0               0    
Expected decrease in uncertain tax position in next twelve months 0               0    
Federal                      
Tax Credit Carryforward [Line Items]                      
Operating loss carryforwards 698,952,000               698,952,000    
Net operating loss                   $ 676,746,000  
State                      
Tax Credit Carryforward [Line Items]                      
Operating loss carryforwards 222,874,000               222,874,000    
Tax credit carryforward $ 783,000               783,000    
Impact of adoption of Topic 606                      
Tax Credit Carryforward [Line Items]                      
Increase (decrease) in valuation allowance affecting income tax expense                 $ (5,945,000)