Share-Based Compensation (Details 2) - USD ($) $ / shares in Units, shares in Thousands, $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Unvested Stock Options
Unvested stock options
Options outstanding at the beginning of the period (in shares)	349
Granted (in shares)	158
Vested (in shares)	(262)
Forfeited (in shares)	(16)
Options outstanding at the end of the period (in shares)	229	349
Weighted-Average Grant-Date Fair Value
Options outstanding at the beginning of the period (in dollars per share)	$ 9.08
Granted (in dollars per share)	4.40
Vested (in dollars per share)	7.26
Forfeited (in dollars per share)	5.59
Options outstanding at the end of the period (in dollars per share)	$ 8.16	$ 9.08
Total future compensation cost related to unvested options that are expected to vest	$ 0.6
Weighted Average Period for Cost recognition	1 year
Key Officer Director and Managerial Employee Stock Options
Unvested stock options
Granted (in shares)	158
Weighted-Average Grant-Date Fair Value
Granted (in dollars per share)	$ 4.40	$ 6.76	$ 6.05
Total intrinsic value of stock options exercised	$ 0.8	$ 49.1	$ 4.1
Total fair value of option vested during the period	$ 1.9	$ 2.0	$ 4.3