Annual report pursuant to Section 13 and 15(d)

SCHEDULE II - VALUATION AND QUALIFYING ACCOUNTS Changes In Allowance For Doubtful Accounts (Details)

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SCHEDULE II - VALUATION AND QUALIFYING ACCOUNTS Changes In Allowance For Doubtful Accounts (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Valuation and Qualifying Accounts [Abstract]      
Balance at Beginning of Year $ 2,468 $ 2,318 $ 2,363
Additions Charged to Income 4,458 4,786 3,377
Deductions 2,975 4,636 3,422
Balance at End of Year $ 3,951 $ 2,468 $ 2,318