XML 129 R111.htm IDEA: XBRL DOCUMENT v3.6.0.2
Employee Benefit Plans (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Contributions based on wages paid to covered employees $ 1.5 $ 1.4 $ 1.4
Voluntary contributions to the 401(k) profit-sharing plans and trusts $ 3.9 $ 3.3 $ 4.1