Annual report pursuant to Section 13 and 15(d)

Segment Information (Narrative) (Details)

v3.10.0.1
Segment Information (Narrative) (Details) - segment
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Number of segments 2    
Sales Revenue, Goods, Net [Member] | Customer Concentration Risk [Member]      
Concentration risk, percentage 12.00% 14.00% 16.00%
Sales Revenue, Goods, Net [Member] | Product Concentration Risk [Member] | Climb [Member]      
Concentration risk, percentage 30.00%    
Sales Revenue, Goods, Net [Member] | Product Concentration Risk [Member] | Mountain [Member]      
Concentration risk, percentage 34.00%    
Sales Revenue, Goods, Net [Member] | Product Concentration Risk [Member] | Ski [Member]      
Concentration risk, percentage 19.00%    
Sales Revenue, Goods, Net [Member] | Product Concentration Risk [Member] | Sport [Member]      
Concentration risk, percentage 17.00%