Income Taxes (Effective Income Tax Rate Reconciliation) (Details)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Income Taxes
Federal tax expense at the statutory rate	35.00%	35.00%	35.00%
State tax expense at the statutory rate, net of federal tax benefits	5.80%	5.40%	6.80%
Foreign taxes	0.60%	0.10%	2.90%
Effect of non-deductible meals and entertainment expense	0.70%	0.70%	1.40%
Deemed liquidation of certain foreign entities			(3.80%)
Effect of other transactions, net	(0.30%)	0.60%	(0.70%)
Effective income tax rate	41.80%	41.80%	41.60%