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Share Based Compensation (Details) (USD $) In Millions, except Share data, unless otherwise specified	0 Months Ended	3 Months Ended
	Feb. 15, 2013	Mar. 31, 2013	Mar. 31, 2012
Performance Unit Plan [Abstract]
Performance units granted	15,256
Compensation expense		$ 0.9	$ 0.4
Cash payments for prior activity		1.0
Forfeitures		0	0
Vested awards		$ 3.7

Equity-based compensation cost during the period with respect to the award, which will be recognized in income (as well as the total recognized tax benefit) or capitalized as part of the cost of an asset.

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