Receivables and Allowance for Doubtful Receivables (Receivables by Type) (Details) - USD ($) $ in Thousands |
Dec. 31, 2017 |
Dec. 31, 2016 |
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| Accounts, Notes, Loans and Financing Receivable [Line Items] | ||
| Total receivables | $ 188,580 | $ 184,296 |
| Trade | ||
| Accounts, Notes, Loans and Financing Receivable [Line Items] | ||
| Total receivables | 187,000 | 182,993 |
| Other | ||
| Accounts, Notes, Loans and Financing Receivable [Line Items] | ||
| Total receivables | $ 1,580 | $ 1,303 |
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. No definition available.
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- Definition 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. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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