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Accounts Receivable (Details 1) - USD ($) $ in Thousands | Jun. 30, 2019 | Dec. 31, 2018
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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

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