Stockholders' Equity (Summary of Stock Options Outstanding) (Details) $ / shares in Units, $ in Millions	12 Months Ended
	Dec. 31, 2015 USD ($) $ / shares shares
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range
Options shares outstanding	212,030	[1]
Option shares exercisable (in shares)	162,170	[1]
Aggregate intrinsic value, option shares outstanding | $	$ 9.6
Aggregate intrinsic value, option shares exercisable | $	$ 7.5
Weighted average remaining term, option shares outstanding	1 year 5 months
Weighted average remaining term, option shares exercisable	1 year 2 months
$13.67
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range
Exercise price | $ / shares	$ 13.67
Options shares outstanding	108,450
Remaining life in years	10 months 8 days
Option shares exercisable (in shares)	108,450
$17.17
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range
Exercise price | $ / shares	$ 17.17
Options shares outstanding	103,580
Remaining life in years	1 year 10 months 8 days
Option shares exercisable (in shares)	53,720

[1] The aggregate intrinsic value for option shares outstanding and option shares exercisable is $9.6 million and $7.5 million, respectively. The weighted average remaining term for option shares outstanding and option shares exercisable is 1.4 years and 1.2 years, respectively.