Accounts Receivable (Details 1) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Accounts and Financing Receivable, after Allowance for Credit Loss [Abstract]
Receivable from contracts with customers, less doubtful accounts	$ 506,734	$ 538,021
Other Receivables	28,374	44,259
Accounts receivable, net	535,108	582,280
Allowance for doubtful accounts	$ 13,212	$ 14,775

Amount, after allowance for credit loss, of right to consideration from customer for product sold and service rendered in normal course of business, classified as current.

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Data Type:	xbrli:monetaryItemType
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