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Subsequent Events Subsequent Events (Narrative) (Details) - USD ($)
$ in Thousands
1 Months Ended 3 Months Ended
Apr. 30, 2019
Mar. 31, 2019
Apr. 10, 2019
Dec. 31, 2018
Subsequent Event [Member]        
Subsequent Event [Line Items]        
Subsequent Event, Date Apr. 10, 2019      
Line of Credit Facility, Maximum Borrowing Capacity   $ 300,000    
Line of Credit Facility, Expiration Date Apr. 10, 2024      
Revolving Credit Facility [Member]        
Subsequent Event [Line Items]        
LineOfCreditFacilityBorrowingCapacityIncrease   200,000    
Long-term Line of Credit   $ 0   $ 0
Revolving Credit Facility [Member] | Subsequent Event [Member]        
Subsequent Event [Line Items]        
Line of Credit Facility, Maximum Borrowing Capacity     $ 300,000  
Secured Letters Of Credit [Member] | Revolving Credit Facility [Member] | Subsequent Event [Member]        
Subsequent Event [Line Items]        
Line of Credit Facility, Maximum Borrowing Capacity     $ 200,000