Current report of foreign issuer pursuant to Rules 13a-16 and 15d-16 Amendments

Revenues (Schedule of Disaggregation of Revenues) (Details)

v3.19.3
Revenues (Schedule of Disaggregation of Revenues) (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Disaggregation of Revenue [Line Items]        
Total Revenues $ 157,460 $ 162,049 $ 475,923 $ 486,118
Products [Member]        
Disaggregation of Revenue [Line Items]        
Total Revenues 106,346 109,647 321,778 331,967
Services [Member]        
Disaggregation of Revenue [Line Items]        
Total Revenues 51,114 52,402 154,145 154,151
Americas [Member]        
Disaggregation of Revenue [Line Items]        
Total Revenues 106,904 105,027 311,428 299,731
Americas [Member] | Products [Member]        
Disaggregation of Revenue [Line Items]        
Total Revenues 67,088 64,257 192,279 181,695
Americas [Member] | Services [Member]        
Disaggregation of Revenue [Line Items]        
Total Revenues 39,816 40,770 119,149 118,036
EMEA [Member]        
Disaggregation of Revenue [Line Items]        
Total Revenues 28,933 32,436 93,866 108,634
EMEA [Member] | Products [Member]        
Disaggregation of Revenue [Line Items]        
Total Revenues 22,710 25,880 74,119 87,808
EMEA [Member] | Services [Member]        
Disaggregation of Revenue [Line Items]        
Total Revenues 6,223 6,556 19,747 20,826
Asia Pacific [Member]        
Disaggregation of Revenue [Line Items]        
Total Revenues 21,623 24,586 70,629 77,753
Asia Pacific [Member] | Products [Member]        
Disaggregation of Revenue [Line Items]        
Total Revenues 16,548 19,511 55,380 62,464
Asia Pacific [Member] | Services [Member]        
Disaggregation of Revenue [Line Items]        
Total Revenues $ 5,075 $ 5,075 $ 15,249 $ 15,289