Annual report pursuant to Section 13 and 15(d)

Employee Benefits (Details)

v3.3.1.900
Employee Benefits (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Compensation and Retirement Disclosure [Abstract]      
Employer matching contribution percent 100.00%    
Employer matching percent 6.00%    
Employer contributions $ 4,733 $ 4,556 $ 4,524