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Debt (Narrative) (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Dec. 31, 2018
Debt [Line Items]      
Repayment of debt $ 12,235 $ 29,237  
Delayed Draw Term Loans [Member]      
Debt [Line Items]      
Repayment of debt 10,000 $ 25,000  
Committed Revolving Credit Facilities [Member]      
Debt [Line Items]      
Maximum borrowing capacity 485,366    
Available borrowing capacity $ 480,962    
Revolving Credit Facility [Member]      
Debt [Line Items]      
Weighted average interest rate 3.60%   2.30%