Stock-Based Compensation (Details) (USD $) In Millions, except Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Stock-Based Compensation
Stock-based compensation expense	$ 1.0	$ 1.2	$ 3.3	$ 4.4
Employee Non Employee Stock Option
Stock-Based Compensation
Number of Shares Granted	116,210
Weighted-Average Grant-Date Fair Value (in dollars per share)	$ 2.21
Non Vested Shares
Stock-Based Compensation
Number of Shares Granted	55,459
Weighted-Average Grant-Date Fair Value (in dollars per share)	$ 6.92
Performance Shares
Stock-Based Compensation
Number of Shares Granted	22,666
Weighted-Average Grant-Date Fair Value (in dollars per share)	$ 6.04