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Income Taxes Income Tax Rate Reconciliation (Details)
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Effective Income Tax Rate, Continuing Operations, Tax Rate Reconciliation [Abstract]      
U.S. federal statutory income tax rate 35.00% 35.00% 35.00%
REIT income not subject to federal tax (7.10%) (10.40%) (16.80%)
Income tax rate at federal statutory rates 27.90% 24.60% 18.20%
Installment note prepayment 0.00% (3.70%) 0.00%
Built-in gains tax holiday 0.00% (1.90%) 0.00%
CBPC 0.00% 0.00% (10.50%)
CBPC for AFMC Exchange (3.30%) (1.90%) 0.00%
Taxing authority settlements and unrecognized tax benefit adjustments 0.00% (5.30%) (1.10%)
Other (0.50%) (1.90%) (0.10%)
Income tax rate as reported 24.10% 9.90% 6.50%