Income Taxes (Schedule of Reconciliation of the U.S. Federal Statutory Rate to Effective Tax Rate) (Details)	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Income Tax Disclosure [Abstract]
U.S. federal statutory rate	35.00%	35.00%	35.00%	35.00%
State income taxes	1.60%	2.00%	2.30%	1.70%
Changes in reserve for uncertain tax positions as a result of settlements and lapsed statutes and related interest	(0.40%)	(0.30%)	(0.50%)	(0.20%)
Other	0.20%	0.20%	0.20%	0.10%
Effective tax rate	36.40%	36.90%	37.00%	36.60%