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Stock-Based Compensation (Details 5) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Other information
Stock-based compensation expense recognized (in dollars)	$ 2.9	$ 2.1	$ 1.6
Stock Option
Other information
Total unrecognized stock-based compensation expense, net of estimated forfeitures (in dollars)	1.4
Weighted average vesting period	1 year 10 months 24 days
Restricted Stock
Other information
Total unrecognized stock-based compensation expense, net of estimated forfeitures (in dollars)	2.8
Weighted average vesting period	3 years 2 months 12 days
Performance Awards
Other information
Total unrecognized stock-based compensation expense, net of estimated forfeitures (in dollars)	1.1
Weighted average vesting period	1 year 8 months 12 days
LTIP
Other information
Total unrecognized stock-based compensation expense, net of estimated forfeitures (in dollars)	$ 5.3

Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

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