Employee Benefit Plans (Other Emp Benefit) (Details) $ in Millions	12 Months Ended
	Dec. 31, 2015 USD ($) item	Dec. 31, 2014 USD ($)	Dec. 31, 2013 USD ($)
Employer maximum contribution (as a percent)	6.00%
Contributions made	$ 1.5	$ 1.1	$ 1.0
Life Insurance
Split dollar life insurance
Number of current employees covered under split dollar life insurance plans | item	0
Expected to be paid in next year	$ 0.7
Life insurance liability	$ 4.8	$ 6.7
Discount rate (as a percent)	3.42%	2.98%
Cash surrender value	$ 6.2	$ 6.4