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Derivative Financial Instruments Narrative (Details)
1 Months Ended 12 Months Ended
Jan. 31, 2019
USD ($)
Dec. 31, 2015
USD ($)
Sep. 30, 2019
USD ($)
contracts
Dec. 31, 2018
USD ($)
Sep. 30, 2018
USD ($)
Apr. 30, 2018
USD ($)
Dec. 31, 2017
USD ($)
Net unrealized loss on hedging instruments     $ 207,054,000 $ 196,305,000      
Total debt     987,500,000        
Debt Instrument, interest rate, stated percentage           1.38%  
Secured Debt [Member]              
Total debt     987,500,000 1,037,813,000      
Accumulated Other Comprehensive Income, Net Unrealized Gain (Loss) on Nonderivative Instruments [Member]              
Net unrealized loss on hedging instruments     $ 14,380,000 $ 14,380,000 $ 14,380,000   $ 14,380,000
Number of Counterparties [Member]              
Derivative counterparties     6 5      
Interest Rate Swap [Member]              
Number of interest rate derivatives held   1          
Derivative, notional amount   $ 214,000,000          
Pay fixed interest rate in interest rate swap   1.42%          
Interest rate cash flow hedge gain (loss) to be reclassified during next 12 months, net     $ 300,000        
Interest Rate Cap [Member]              
Number of interest rate derivatives held   3          
Derivative, notional amount   $ 100,000,000          
Interest rate cash flow hedge gain (loss) to be reclassified during next 12 months, net     $ (500,000)        
Derivative purchase price   $ 1,700,000          
Derivative, cap interest rate   2.00%          
Currency Swap [Member]              
Derivative, notional amount           $ 56,000,000.0  
Foreign currency cash flow hedge gain (loss) to be reclassified during next 12 months           $ 1,200,000  
Foreign Exchange Option [Member]              
Derivative, notional amount $ 72,000,000            
Derivative purchase price $ 1,300,000            
Forward Contracts [Member]              
Number of foreign exchange contracts | contracts     50        
Foreign Exchange Contract [Member] | Not Designated as Hedging Instrument [Member] | Minimum [Member]              
Derivative, notional amount     $ 120,000        
Foreign Exchange Contract [Member] | Not Designated as Hedging Instrument [Member] | Maximum [Member]              
Derivative, notional amount     26,400,000        
London Interbank Offered Rate (LIBOR) [Member] | Secured Debt [Member]              
Total debt     $ 587,500,000