Annual report pursuant to Section 13 and 15(d)

Inventories - Narrative (Details)

v3.8.0.1
Inventories - Narrative (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Inventory Disclosure [Abstract]    
Change in accounting principle effect on inventory $ 0.3 $ 0.4