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Receivables (Schedule of Allowance for Doubtful Accounts) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Accounts Receivable, Allowance for Credit Loss [Roll Forward]      
Balance at beginning of period $ 7,393 $ 8,468 $ 6,505
Charged to costs and expenses, net of recoveries (5,572) 31 2,001
Amounts written off (759) (1,106) (38)
Balance at end of period $ 1,062 $ 7,393 $ 8,468