|3 Months Ended|
Mar. 31, 2018
|Goodwill and Intangible Assets Disclosure [Abstract]|
|Schedule of Goodwill||
The changes in the carrying amount of goodwill by segment were as follows (in thousands):
Tabular disclosure of goodwill by reportable segment and in total which includes a rollforward schedule.
Reference 1: http://www.xbrl.org/2003/role/presentationRef