Income Taxes (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		12 Months Ended
	Mar. 31, 2012	Mar. 31, 2011	Dec. 31, 2011
Operating Loss Carryforwards [Line Items]
Effective Income Tax Rate, Continuing Operations	35.40%		44.30%
Business Combination, Step Acquisition, Equity Interest in Acquiree, Remeasurement Gain	$ (5,719)	$ 0