Employee Benefit Plans (Narrative) (Details) $ in Millions	9 Months Ended
	Sep. 30, 2017 USD ($)
Defined benefit pension plan
Defined Benefit Plan Disclosure [Line Items]
Cash balance pension revaluation adjustment	$ 4.3
Revaluation discount rate	3.60%
Other Comprehensive Income (Loss)
Defined Benefit Plan Disclosure [Line Items]
Benefit plan revaluation adjustment	$ (3.8)
Revaluation adjustment discount rate	3.59%