|12 Months Ended|
Dec. 31, 2017
|Goodwill And Intangible Assets Disclosure [Abstract]|
The following is a summary of the changes to the carrying amount of goodwill as of December 31, 2017 and December 31, 2016:
The entire disclosure for goodwill.
Reference 1: http://www.xbrl.org/2003/role/presentationRef