Quarterly report pursuant to Section 13 or 15(d)

Fair Value Measurements (Details)

Fair Value Measurements (Details) - Deferred compensation plan - Management
$ in Millions
6 Months Ended
Jun. 30, 2017
USD ($)
Assets and liabilities measured at fair value on a recurring basis  
Maximum percentage of participants' compensation which is deferrable (as a percent) 100.00%
Balance of the plan which was fully funded $ 4.1