General form of registration statement for all companies including face-amount certificate companies

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 ($)
1 Months Ended 2 Months Ended 3 Months Ended 8 Months Ended 9 Months Ended 12 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
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Jan. 01, 2018
AOCI Attributable to Parent, Net of Tax [Roll Forward]                          
Beginning Balance $ 379,400,000 $ (678,864,000) $ (623,775,000) $ (588,975,000) $ (167,695,000) $ 68,220,000 $ 102,736,000 $ (588,975,000) $ 102,736,000 $ 102,736,000 $ 214,945,000 $ 201,065,000  
Adjusted balance at January 1, 2018                         $ 80,016,000
Unrealized gain on derivatives recognized through Accumulated other comprehensive income (loss), net of income tax of $0         3,165,000 5,096,000 13,668,000     12,882,000 (3,842,000) (2,673,000)  
Fresh start adjustment [1]   (6,668,000)                      
Net period Other comprehensive income 0 0 (472,000) (468,000) 3,269,000 5,521,000 14,406,000 (940,000) 23,196,000 14,378,000 1,582,000 4,589,000  
Ending Balance 368,593,000 379,400,000 (678,864,000) (623,775,000) (202,907,000) (167,695,000) 68,220,000 379,400,000 (202,907,000) (588,975,000) 102,736,000 214,945,000  
Unrealized gain on derivatives recognized through Accumulated other comprehensive income (loss), tax         0 0 0     0 0 0  
Accounting Standards Update 2017-12                          
AOCI Attributable to Parent, Net of Tax [Roll Forward]                          
Impact of adoption of ASU 2017-12                         605,000
AOCI Attributable to Parent                          
AOCI Attributable to Parent, Net of Tax [Roll Forward]                          
Beginning Balance 0 6,668,000 7,140,000 7,608,000 13,157,000 7,636,000 (7,375,000) 7,608,000 (7,375,000) (7,375,000) (8,957,000) (13,546,000)  
Adjusted balance at January 1, 2018                         (6,770,000)
Net period Other comprehensive income     (472,000) (468,000) 3,269,000 5,521,000 14,406,000     14,378,000 1,582,000 4,589,000  
Ending Balance $ 0 $ 0 6,668,000 7,140,000 16,426,000 13,157,000 7,636,000 $ 0 $ 16,426,000 $ 7,608,000 $ (7,375,000) $ (8,957,000)  
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                         $ 605,000
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     (472,000) [2] (468,000) [2] 104,000 [3] 425,000 [3] 738,000 [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.