Quarterly report pursuant to Section 13 or 15(d)

Stockholder's Equity - Summary of Accumulated Other Comprehensive Income (Loss) (Details)

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Stockholder's Equity - Summary of Accumulated Other Comprehensive Income (Loss) (Details) - USD ($)
$ in Thousands
1 Months Ended 2 Months Ended 3 Months Ended 8 Months Ended 9 Months Ended
Sep. 30, 2019
Aug. 31, 2019
Jun. 30, 2019
Mar. 31, 2019
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Aug. 31, 2019
Sep. 30, 2018
Jan. 01, 2018
AOCI Attributable to Parent, Net of Tax [Roll Forward]                    
Beginning Balance $ 379,400 $ (678,864) $ (623,775) $ (588,975) $ (167,695) $ 68,220 $ 102,736 $ (588,975) $ 102,736  
Adjusted balance at January 1, 2018                   $ 80,016
Unrealized gain on derivatives recognized through Accumulated other comprehensive income (loss), net of income tax of $0         3,165 5,096 13,668      
Fresh start adjustment [1]   (6,668)                
Net period Other comprehensive income 0 0 (472) (468) 3,269 5,521 14,406 (940) 23,196  
Ending Balance 368,593 379,400 (678,864) (623,775) (202,907) (167,695) 68,220 379,400 (202,907)  
Unrealized gain on derivatives recognized through Accumulated other comprehensive income (loss), tax         0 0 0      
Accounting Standards Update 2017-12                    
AOCI Attributable to Parent, Net of Tax [Roll Forward]                    
Impact of adoption of ASU 2017-12                   605
AOCI Attributable to Parent                    
AOCI Attributable to Parent, Net of Tax [Roll Forward]                    
Beginning Balance 0 6,668 7,140 7,608 13,157 7,636 (7,375) 7,608 (7,375)  
Adjusted balance at January 1, 2018                   (6,770)
Net period Other comprehensive income     (472) (468) 3,269 5,521 14,406      
Ending Balance $ 0 $ 0 6,668 7,140 16,426 13,157 7,636 $ 0 $ 16,426  
AOCI Attributable to Parent | Accounting Standards Update 2017-12                    
AOCI Attributable to Parent, Net of Tax [Roll Forward]                    
Impact of adoption of ASU 2017-12                   $ 605
Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent                    
AOCI Attributable to Parent, Net of Tax [Roll Forward]                    
Reclassifications of unrealized loss on derivatives into Net loss, net of income tax of $0     (472) [2] (468) [2] 104 [3] 425 [3] 738 [3]      
Reclassifications of unrealized loss on derivatives into Net loss, tax     $ 0 $ 0 $ 0 $ 0 $ 0      
[1] The remaining amount recognized in Accumulated other comprehensive income (loss) was evaluated to have no fair value upon the application of fresh start accounting pursuant to the Plan. See note 3, Fresh Start Accounting for further information.
[2] Amounts reclassified into Net loss are included in Interest expense on the condensed consolidated statements of operations. See note 7, Derivatives for further information.
[3] Amounts reclassified into Net loss are included in Interest expense on the condensed consolidated statements of operations.