Income Taxes - Components of Income Tax Expense (Benefit) by Jurisdiction and by Classification (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		12 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Dec. 31, 2012	Dec. 31, 2011
Operating Loss Carryforwards [Line Items]
Effective Income Tax Rate, Continuing Operations	36.80%	36.00%
U.S. Federal
Current			$ 0	$ (3,440)
Deferred			(532)	163
Total			(532)	(3,277)
State and local
Current			27	(21)
Deferred			(135)	(261)
Total			(108)	(282)
Total Income Taxes
Current			27	(3,461)
Deferred	(667)	(98)	(667)	(98)
Total			$ (640)	$ (3,559)