Annual report pursuant to Section 13 and 15(d)

Schedule II - Valuation And Qualifying Accounts (Details)

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Schedule II - Valuation And Qualifying 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 Period $ 3,083 $ 4,453 $ 5,564
Charged to Costs and Expenses 2,555 1,427 1,511
Deductions 2,150 2,797 2,622
Balance at End of Period $ 3,488 $ 3,083 $ 4,453