Allowance for Credit Losses - Aging of Past-Due Receivables (Details) (Notes Receivable [Member], USD $) In Thousands, unless otherwise specified	Sep. 30, 2014		Dec. 31, 2013
Notes Receivable [Member]
Summarizes the Company's aging of past-due notes receivable
30-59 days past due	$ 0		$ 85
60-89 days past due	0		0
89 days past due (1)	1,518	[1]	0
Total past due	$ 1,518		$ 85

[1] Past-due notes receivable balances greater than 89 days as of September 30, 2014 are fully reserved.