XML 86 R73.htm IDEA: XBRL DOCUMENT v3.3.1.900
Employee Retirement Plans (Details Textual) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Compensation and Retirement Disclosure [Abstract]    
Actual employer contributions to defined benefit plans $ 0.7 $ 3.4
Expected full year contributions by the employer to defined benefit plans 8.8  
Contributions to multiemployer plan 0.5 $ 0.7
Expected full year contributions by the employer to the multiemployer plan $ 2.2