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Revenues (Shedule of Disaggregation of Revenues) (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Disaggregation of Revenue [Line Items] |  |  |
Total Revenues | $ 663,237 | $ 668,362 | $ 672,458
Revenues recognized in point in time [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total Revenues | 587,477 | 594,817 | 599,634
Revenues recognized over time [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total Revenues | 75,760 | 73,545 | 72,824
Products [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total Revenues | 456,504 | 474,286 | 479,031
Products [Member] | Revenues recognized in point in time [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total Revenues | 456,504 | 474,286 | 479,031
Services [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total Revenues | 206,733 | 194,076 | 193,427
Services [Member] | Revenues recognized in point in time [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total Revenues | 130,973 | 120,531 | 120,603
Services [Member] | Revenues recognized over time [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total Revenues | 75,760 | 73,545 | 72,824
Americas [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total Revenues | 409,741 | 413,326 | 411,536
Americas [Member] | Products [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total Revenues | 251,589 | 263,212 | 257,547
Americas [Member] | Services [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total Revenues | 158,152 | 150,114 | 153,989
EMEA [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total Revenues | 147,162 | 148,279 | 137,924
EMEA [Member] | Products [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total Revenues | 119,151 | 123,616 | 117,074
EMEA [Member] | Services [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total Revenues | 28,011 | 24,663 | 20,850
Asia Pacific [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total Revenues | 106,334 | 106,757 | 122,998
Asia Pacific [Member] | Products [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total Revenues | 85,764 | 87,458 | 104,410
Asia Pacific [Member] | Services [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total Revenues | $ 20,570 | $ 19,299 | $ 18,588

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