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

Stockholder's Equity - Roll Forward Activity (Details)

v3.19.3.a.u2
Stockholder's Equity - Roll Forward Activity (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
Accumulated Other Comprehensive Income (Loss), 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)  
Reclassifications of unrealized loss on derivatives into Net loss, net of income tax of $0                   1,496,000 5,424,000 7,262,000  
Other comprehensive (loss) 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 (loss) on derivatives recognized through Accumulated other comprehensive income (loss), income tax         0 0 0     0 0 0  
Reclassifications of unrealized loss on derivatives into Net loss, income tax                   0 0 0  
Accounting Standards Update 2017-12                          
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]                          
Impact of adoption of ASU 2017-12                         605,000
Accumulated Other Comprehensive Income (Loss)                          
Accumulated Other Comprehensive Income (Loss), 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)
Other comprehensive (loss) 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)  
Accumulated Other Comprehensive Income (Loss) | Accounting Standards Update 2017-12                          
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]                          
Impact of adoption of ASU 2017-12                         $ 605,000