|12 Months Ended|
Dec. 31, 2018
|Revenue from Contract with Customer [Abstract]|
|Revenue by major geographic area, and by significant product and service offerings||
Revenue, classified by the major geographic areas in which our customers are located, was as follows:
Revenue from external customers, classified by significant product and service offerings, was as follows:
Tabular disclosure of disaggregation of revenue into categories depicting how nature, amount, timing, and uncertainty of revenue and cash flows are affected by economic factor.
Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef