Equity and Stock-based Compensation (Status of Nonvested Stock Options) (Details) - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Shares
Granted	195,017
Stock Options [Member]
Shares
Nonvested beginning balance	988,338
Granted	195,017
Vested	(635,050)
Forfeited	(44,565)
Nonvested ending balance	503,740	988,338
Weighted Average Fair Value
Nonvested beginning balance	$ 4.02
Granted	6.96
Vested	5.02
Forfeited	6.77
Nonvested ending balance	$ 6.92	$ 4.02
Total fair value of shares vested	$ 3.2	$ 3.2	$ 4.0