Summary of Significant Accounting Policies (Tables)
|12 Months Ended|
Dec. 31, 2017
|Accounting Policies [Abstract]|
|Schedule of Goodwill [Table Text Block]||
The changes in the carrying amount of goodwill for the years ended December 31, 2017 and 2016, are 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