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Financing Arrangements (Narrative) (Details) - USD ($)
$ in Thousands
May 02, 2011
Dec. 31, 2016
Oct. 13, 2016
Dec. 31, 2015
Debt Disclosure [Abstract]        
Revolving line of credit $ 400,000      
Increase, additional borrowings 200,000      
Maximum facility size 600,000      
Additional indebtedness $ 110,000      
Capitilized debt issuance costs   $ 900    
Long-term Line of Credit   251,200   $ 90,500
Outstanding letters of credit   $ 53,612 $ 205,000