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

Revenues (Schedule of Disaggregation of Revenues) (Details)

v3.19.2
Revenues (Schedule of Disaggregation of Revenues) (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Disaggregation of Revenue [Line Items]        
Total Revenues $ 163,163 $ 170,236 $ 318,463 $ 324,069
Products [Member]        
Disaggregation of Revenue [Line Items]        
Total Revenues 110,341 118,403 215,432 222,320
Services [Member]        
Disaggregation of Revenue [Line Items]        
Total Revenues 52,822 51,833 103,031 101,749
Americas [Member]        
Disaggregation of Revenue [Line Items]        
Total Revenues 108,025 106,790 204,523 194,704
Americas [Member] | Products [Member]        
Disaggregation of Revenue [Line Items]        
Total Revenues 67,137 67,193 125,191 117,437
Americas [Member] | Services [Member]        
Disaggregation of Revenue [Line Items]        
Total Revenues 40,888 39,597 79,332 77,267
EMEA [Member]        
Disaggregation of Revenue [Line Items]        
Total Revenues 30,149 37,227 64,932 76,198
EMEA [Member] | Products [Member]        
Disaggregation of Revenue [Line Items]        
Total Revenues 23,323 29,948 51,408 61,929
EMEA [Member] | Services [Member]        
Disaggregation of Revenue [Line Items]        
Total Revenues 6,826 7,279 13,524 14,269
Asia Pacific [Member]        
Disaggregation of Revenue [Line Items]        
Total Revenues 24,989 26,219 49,008 53,167
Asia Pacific [Member] | Products [Member]        
Disaggregation of Revenue [Line Items]        
Total Revenues 19,881 21,262 38,833 42,954
Asia Pacific [Member] | Services [Member]        
Disaggregation of Revenue [Line Items]        
Total Revenues $ 5,108 $ 4,957 $ 10,175 $ 10,213