Income Taxes Reconciliation of Statutory and Effective Tax Rates (Details)	11 Months Ended	12 Months Ended		1 Months Ended
	Dec. 31, 2010 Successor [Member]	Dec. 31, 2012 Successor [Member]	Dec. 31, 2011 Successor [Member]	Feb. 12, 2010 Predecessor [Member]
Effective Income Tax Rate, Continuing Operations, Tax Rate Reconciliation [Abstract]
Federal Statutory Income Tax Rate	35.00%	35.00%	35.00%	35.00%
State income taxes, net of federal tax benefit	3.10%	2.50%	2.40%	3.10%
Tax law change (Medicare Part D)	0.50%	0.00%	0.00%	0.00%
Other, net	(0.50%)	(0.20%)	(0.10%)	2.50%
Effective Tax Rate	38.10%	37.30%	37.30%	40.60%