XML 62 R47.htm IDEA: XBRL DOCUMENT v3.8.0.1
Equity Compensation and Employee Benefit Plans (Contributions for Employee Stock Purchase Plan) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Compensation and Retirement Disclosure [Abstract]      
Contributions for Employee Stock Purchase Plan $ 208 $ 183 $ 182