Annual report pursuant to Section 13 and 15(d)

Restructuring - (Narrative) (Details)

v3.8.0.1
Restructuring - (Narrative) (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
Cumulative restructuring charges 5,969    
2015 Plan [Member]      
Restructuring Cost and Reserve [Line Items]      
Restructuring charges 160 $ 1,365 $ 1,019
Cumulative restructuring charges $ 2,544