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Basis Of Presentation Revenue Recognition Disclosures (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts Receivable, Gross, Current	$ 129,056	$ 113,556
Other Receivables	4,604	9,883
Accounts Receivable, Gross	133,660	123,439
Allowance for Doubtful Accounts, Premiums and Other Receivables	(3,109)	(3,304)
Receivables, Net, Current	$ 130,551	$ 120,135

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For unclassified balance sheet, amounts due from customers or clients for goods or services that have been delivered or sold in the normal course of business.

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Amounts due from customers or clients, within one year of the balance sheet date (or the normal operating cycle, whichever is longer) for goods or services (including trade receivables) that have been delivered or sold in the normal course of business.

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