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Derivatives - Summary of Derivatives Designated as Cash Flow Hedges (Details)

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Derivatives - Summary of Derivatives Designated as Cash Flow Hedges (Details) - USD ($)
$ in Thousands
1 Months Ended 2 Months Ended 3 Months Ended 8 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2019
Aug. 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
Derivative Instruments, Gain (Loss) [Line Items]                    
Effective portion of gain recognized in Accumulated other comprehensive income (loss)     $ 3,165 $ 5,096 $ 13,668     $ 12,882 $ (3,842) $ (2,673)
Effective portion of loss reclassified from Accumulated other comprehensive income (loss) into Net income (loss)               1,496 5,424 7,262
Interest Rate Swap | Cash flow hedge                    
Derivative Instruments, Gain (Loss) [Line Items]                    
Effective portion of gain recognized in Accumulated other comprehensive income (loss) $ 0 $ 0 3,165     $ 0 $ 21,929 12,882 (3,842) (2,673)
Effective portion of loss reclassified from Accumulated other comprehensive income (loss) into Net income (loss) $ 0 [1] $ 0 [1] $ (104) [1]     $ (940) $ (1,267) $ 1,496 $ 5,424 $ 7,262
[1] Amounts are included in Interest expense in the unaudited condensed consolidated statements of operations and comprehensive income (loss).