Income Taxes (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		12 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Dec. 31, 2012
Operating Loss Carryforwards [Line Items]
Effective Income Tax Rate, Continuing Operations	38.70%		41.20%
Business Combination, Step Acquisition, Equity Interest in Acquiree, Remeasurement Gain	$ 0	$ (5,719)