v2.4.0.6
Income Taxes (Reconciliation of Effective Income Tax Rate) (Details)
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Income Tax Disclosure [Abstract]      
Tax at federal statutory rate 35.00% 35.00% 35.00%
Valuation allowance for deferred tax assets (15.50%) 0.00% 0.00%
Noncontrolling interests (0.50%) (27.70%) (1.50%)
State income taxes, net of federal benefit 0.40% (52.80%) 11.90%
Company provided benefits (0.10%) (6.90%) 3.50%
Compensation-based credits 0.10% 16.30% (6.00%)
Accrued interest on uncertain tax benefits 0.00% (16.00%) 1.60%
Nontaxable gain on acquisition 0.00% 25.50% 0.00%
Other, net (0.10%) (0.80%) (4.30%)
Effective tax rate 19.30% (27.40%) 40.20%