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Share Based Compensation (Details) (USD $) In Millions, except Share data, unless otherwise specified	0 Months Ended	6 Months Ended
	Feb. 15, 2013	Jun. 30, 2013	Jun. 30, 2012
Performance Unit Plan [Abstract]
Performance units granted	15,256
Compensation expense		$ 1.0	$ 0.8
Cash payments for prior activity		1.0
Forfeitures		0	0
Vested awards		$ 3.6

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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