Fair Value Measurements - Narrative (Details) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Related allowance	$ 10,297,000	$ 32,838,000	$ 42,226,000
Impairment losses	70	0	0
Fair Value, Measurements, Nonrecurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Long-lived assets to be disposed of, carrying value	566,000
Impairment losses	70,000
Long-lived assets to be disposed of, fair value	496,000
Long-lived assets to be disposed of, carried at cost	1,513,000
Fair Value, Measurements, Nonrecurring | Fair Value, Inputs, Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Loans receivable, impaired, fair value disclosure	74,623,000	100,035,000
Related allowance	10,297,000	32,838,000
Impaired financing receivable, related allowance, partial loan charge-offs	22,327,000	34,205,000
Carrying Amount | Fair Value, Measurements, Nonrecurring | Fair Value, Inputs, Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Loans receivable, impaired, fair value disclosure	107,247,000	167,078,000
Estimated Fair Value | Fair Value, Measurements, Nonrecurring | Fair Value, Inputs, Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Loans receivable, impaired, fair value disclosure	$ 74,623,000	$ 100,035,000