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Valuation and Qualifying Accounts (Details) - Allowance for Doubtful Accounts [Member] - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Valuation and Qualifying Accounts Disclosure [Line Items]      
Balance at Beginning of Period $ 13,358 $ 5,805 $ 5,369
Additions Charged to Costs and Expenses 10,707 10,263 4,160
Deductions [1] (10,907) (2,710) (3,724)
Balance at End of Period $ 13,158 $ 13,358 $ 5,805
[1] Uncollectible accounts written off, net of recoveries.