Income Taxes (Schedule of Reconciliation of the U.S. Federal Statutory Rate to Effective Tax Rate) (Details)	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Income Tax Disclosure [Abstract]
U.S. federal statutory rate	35.00%	35.00%	35.00%	35.00%
State income taxes	1.30%	1.40%	1.90%	1.60%
Changes in reserve for uncertain tax positions as a result of settlements and lapsed statutes and related interest	(0.40%)	(0.30%)	(0.40%)	(0.30%)
Other	(0.10%)	0.20%	0.10%	0.20%
Effective tax rate	35.80%	36.30%	36.60%	36.50%