Employee Benefit Plans (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended		12 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Dec. 31, 2016
Compensation and Retirement Disclosure [Abstract]
Defined benefit plans, expected contribution to be paid in 2017	$ 2.0
Defined benefit plan, employer contributions			$ 2.0
Defined contribution plan, compensation expense	$ 1.2	$ 0.9