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Valuation And Qualifying Accounts (Details) - Allowance For Doubtful Accounts [Member] - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Valuation and Qualifying Accounts Disclosure [Line Items]      
Balance at beginning of period $ 4,850 $ 3,881 $ 4,140
Additions/charges 7,373 4,309 2,818
Deductions [1] 4,860 3,340 3,077
Balance at end of period $ 7,363 $ 4,850 $ 3,881
[1] Write-offs, net of recoveries