Revenues (Shedule of Disaggregation of Revenues Based on Time) (Details) - USD ($) $ in Thousands |
3 Months Ended | |
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Mar. 31, 2019 |
Mar. 31, 2018 |
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| Disaggregation of Revenue [Line Items] | ||
| Total Revenues | $ 155,300 | $ 153,833 |
| Revenues recognized in point in time [Member] | ||
| Disaggregation of Revenue [Line Items] | ||
| Total Revenues | 136,526 | 134,799 |
| Revenues recognized over time [Member] | ||
| Disaggregation of Revenue [Line Items] | ||
| Total Revenues | $ 18,774 | $ 19,034 |
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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 Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss). Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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