Fair Value Measurements - Narrative (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Related allowance	$ 5,792	$ 8,929	$ 10,297
Impairment losses	102	616	70
Fair Value, Measurements, Nonrecurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Long-lived assets to be disposed of, carrying value	1,785	1,785
Impairment losses	702	599
Long-lived assets to be disposed of, fair value	1,083	1,186
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	30,494	57,302
Related allowance	5,792	8,929
Impaired financing receivable, related allowance, partial loan charge-offs	8,760	14,295
Fair Value, Measurements, Nonrecurring | Carrying Amount | Fair Value, Inputs, Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Loans Receivable, Impaired, Fair Value Disclosure	45,046	80,526
Fair Value, Measurements, Nonrecurring | Estimated Fair Value
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Loans Receivable, Impaired, Fair Value Disclosure	30,494	57,302
Fair Value, Measurements, Nonrecurring | Estimated Fair Value | Fair Value, Inputs, Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Loans Receivable, Impaired, Fair Value Disclosure	$ 30,494	$ 57,302