Annual report pursuant to Section 13 and 15(d)

Revenue From Contracts With Customers (Narrative) (Details)

v3.10.0.1
Revenue From Contracts With Customers (Narrative) (Details) - segment
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Revenue from Contracts with Customers [Abstract]      
Number of reportable segments 2 2 2