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Condensed Consolidated Statements of Cash Flows (Parenthetical) - USD ($)
$ in Thousands
Jun. 30, 2019
Feb. 28, 2019
Dec. 31, 2018
Sep. 30, 2018
Aug. 14, 2018
Jun. 30, 2018
May 31, 2018
Nov. 10, 2016
Nov. 04, 2015
Secured Debt | $108 Million Credit Facility                  
Maximum borrowing capacity $ 108,000   $ 108,000 $ 108,000 $ 108,000        
Secured Debt | $495 Million Credit Facility                  
Maximum borrowing capacity $ 495,000 $ 495,000 $ 495,000            
Secured Debt | $460 Million Credit Facility                  
Maximum borrowing capacity           $ 460,000 $ 460,000    
Secured Debt | $400 Million Credit Facility                  
Maximum borrowing capacity           400,000   $ 400,000  
Line of Credit Facility | $98 Million Credit Facility                  
Maximum borrowing capacity           $ 98,000     $ 98,000