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Revolving Credit Agreement (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Dec. 31, 2018
Line of Credit Facility [Line Items]          
Assets $ 1,636,193   $ 1,636,193   $ 1,395,473
Loss on extinguishment of debt 0 $ (3,058) (169) $ (3,599)  
Revolving Credit Facility          
Line of Credit Facility [Line Items]          
Line of credit facility, Maximum Borrowing Capacity before Accordion 550,000   550,000    
Line of credit facility, current borrowing capacity 920,000   920,000    
Line of credit facility, additional borrowing capacity 100,000   $ 100,000    
Line of credit facility, expiration date     May 31, 2022    
Line of credit facility, extension     1 year    
Line of credit, amount outstanding 760,300   $ 760,300    
Letters of credit outstanding 13,200   13,200    
Line of credit facility, remaining borrowing capacity $ 145,100   $ 145,100    
Base spread on variable rate     2.50%    
Revolving Credit Facility | LIBOR          
Line of Credit Facility [Line Items]          
Variable interest rate 2.04%   2.04%    
Revolving Credit Facility | Minimum          
Line of Credit Facility [Line Items]          
Base spread on variable rate     2.35%    
Revolving Credit Facility | Minimum | Guarantor Subsidiaries          
Line of Credit Facility [Line Items]          
Assets $ 500   $ 500    
Revolving Credit Facility | Maximum          
Line of Credit Facility [Line Items]          
Base spread on variable rate     2.75%