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Subsequent Events (Narrative) (Details) - USD ($)
$ in Thousands
6 Months Ended
Jul. 17, 2017
Jun. 30, 2017
Jun. 30, 2016
Subsequent Event [Line Items]      
Loss on extinguishment of debt   $ (428) $ 0
July 2021 Notes [Member] | Subsequent Event [Member]      
Subsequent Event [Line Items]      
Extinguishment of debt, cash paid $ 413,300    
Debt instrument, redemption price, percentage 3.313%    
Extinguishment of debt, amount $ 400,000    
Loss on extinguishment of debt $ (18,400)