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, 2018
Dec. 31, 2017
Dec. 31, 2016
Valuation And Qualifying Accounts [Abstract]      
Balance at Beginning of Period $ 3,488 $ 3,083 $ 4,453
Charged to Costs and Expenses 3,846 2,555 1,427
Deductions 3,702 2,150 2,797
Balance at End of Period $ 3,632 $ 3,488 $ 3,083