XML 84 R70.htm IDEA: XBRL DOCUMENT v3.8.0.1
Employee Benefits (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Employee Benefits [Abstract]      
Company contributions under the 401(k) Plan $ 0.9 $ 2.2 $ 3.3