Annual and transition report of foreign private issuers pursuant to Section 13 or 15(d)

Revenues (Shedule of Disaggregation of Revenues) (Details)

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Revenues (Shedule of Disaggregation of Revenues) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Disaggregation of Revenue [Line Items]      
Total Revenues $ 636,080 $ 663,237 $ 668,362
Revenues recognized in point in time [Member]      
Disaggregation of Revenue [Line Items]      
Total Revenues 474,631 587,477 594,817
Revenues recognized over time [Member]      
Disaggregation of Revenue [Line Items]      
Total Revenues 161,449 75,760 73,545
Products [Member]      
Disaggregation of Revenue [Line Items]      
Total Revenues 430,746 456,504 474,286
Products [Member] | Revenues recognized in point in time [Member]      
Disaggregation of Revenue [Line Items]      
Total Revenues 430,746 456,504 474,286
Services [Member]      
Disaggregation of Revenue [Line Items]      
Total Revenues 205,334 206,733 194,076
Services [Member] | Revenues recognized in point in time [Member]      
Disaggregation of Revenue [Line Items]      
Total Revenues 43,885 130,973 120,531
Services [Member] | Revenues recognized over time [Member]      
Disaggregation of Revenue [Line Items]      
Total Revenues 161,449 75,760 73,545
Americas [Member]      
Disaggregation of Revenue [Line Items]      
Total Revenues 415,862 409,741 413,326
Americas [Member] | Products [Member]      
Disaggregation of Revenue [Line Items]      
Total Revenues 257,119 251,589 263,212
Americas [Member] | Services [Member]      
Disaggregation of Revenue [Line Items]      
Total Revenues 158,743 158,152 150,114
EMEA [Member]      
Disaggregation of Revenue [Line Items]      
Total Revenues 124,967 147,162 148,279
EMEA [Member] | Products [Member]      
Disaggregation of Revenue [Line Items]      
Total Revenues 98,693 119,151 123,616
EMEA [Member] | Services [Member]      
Disaggregation of Revenue [Line Items]      
Total Revenues 26,274 28,011 24,663
Asia Pacific [Member]      
Disaggregation of Revenue [Line Items]      
Total Revenues 95,251 106,334 106,757
Asia Pacific [Member] | Products [Member]      
Disaggregation of Revenue [Line Items]      
Total Revenues 74,934 85,764 87,458
Asia Pacific [Member] | Services [Member]      
Disaggregation of Revenue [Line Items]      
Total Revenues $ 20,317 $ 20,570 $ 19,299