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Debt Obligations (Narrative) (Details) - USD ($)
$ in Thousands
1 Months Ended 3 Months Ended 6 Months Ended
May 31, 2019
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Debt Instrument [Line Items]          
Debt repaid       $ 361,000  
Loss on extinguishment of debt, net   $ (707) $ (291) (677) $ (423)
Accelerated unamortized debt issuance costs   $ 700   700  
Revolving Credit Facility          
Debt Instrument [Line Items]          
Debt repaid       161,000  
Unsecured Debt          
Debt Instrument [Line Items]          
Debt repaid       $ 200,000  
4.125% Senior Notes due 2029          
Debt Instrument [Line Items]          
Face amount of debt $ 400,000        
Stated spread rate 4.125%        
Redemption price, percentage 100.00%