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

Revenues (Schedule of Disaggregation of Revenues Based on Time) (Details)

v3.19.3
Revenues (Schedule of Disaggregation of Revenues Based on Time) (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
Revenues recognized in point in time [Member]        
Disaggregation of Revenue [Line Items]        
Total Revenues 117,503 120,390 354,309 363,847
Revenues recognized over time [Member]        
Disaggregation of Revenue [Line Items]        
Total Revenues 39,957 41,659 121,614 122,271
Products [Member]        
Disaggregation of Revenue [Line Items]        
Total Revenues 106,346 109,647 321,778 331,967
Products [Member] | Revenues recognized in point in time [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
Services [Member] | Revenues recognized in point in time [Member]        
Disaggregation of Revenue [Line Items]        
Total Revenues 11,157 10,743 32,531 31,880
Services [Member] | Revenues recognized over time [Member]        
Disaggregation of Revenue [Line Items]        
Total Revenues $ 39,957 $ 41,659 $ 121,614 $ 122,271