Annual report pursuant to Section 13 and 15(d)

Valuation And Qualifying Accounts And Reserves (Details)

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Valuation And Qualifying Accounts And Reserves (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 $ 5,668 $ 1,734 $ 1,618
Additions Charged to Cost and Expenses 2,449 3,934 116
Deductions from Reserves
Balance at End of Period $ 8,117 $ 5,668 $ 1,734