Annual report pursuant to Section 13 and 15(d)

Restructuring - (Schedule of Restructuring and Related Costs) (Details)

v3.8.0.1
Restructuring - (Schedule of Restructuring and Related Costs) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Restructuring Cost and Reserve [Line Items]      
Restructuring charges $ 160 $ 1,395 $ 3,375
2014 Plan [Member]      
Restructuring Cost and Reserve [Line Items]      
Restructuring charges 0 30 2,356
2015 Plan [Member]      
Restructuring Cost and Reserve [Line Items]      
Restructuring Reserve, Beginning Balance 96    
Restructuring charges 160 1,365 $ 1,019
Cash payments (163)    
Restructuring Reserve, Ending Balance 93 $ 96  
Other Restructuring [Member] | 2015 Plan [Member]      
Restructuring Cost and Reserve [Line Items]      
Restructuring charges $ 160