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Fair Value Measurements - Assets and Liabilities Measursed on Non-Recurring Basis (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended 12 Months Ended
Dec. 31, 2014
Sep. 30, 2015
Sep. 30, 2014
Dec. 31, 2014
Assets:        
Total Losses $ (800) $ (2,515) $ (276)  
Nonrecurring Basis        
Assets:        
Property and equipment 424     $ 424
Impaired note receivable 0 0   0
Total assets at fair value 424 0   424
Nonrecurring Basis | General and Administrative Expense        
Assets:        
Total Losses, Property and equipment       (355)
Total Losses, Impaired notes receivable   (1,000)   (500)
Total Losses   (1,000)   (855)
Nonrecurring Basis | Level 1        
Assets:        
Property and equipment 0     0
Impaired note receivable 0 0   0
Total assets at fair value 0 0   0
Nonrecurring Basis | Level 2        
Assets:        
Property and equipment 0     0
Impaired note receivable 0 0   0
Total assets at fair value 0 0   0
Nonrecurring Basis | Level 3        
Assets:        
Property and equipment 424     424
Impaired note receivable 0 0   0
Total assets at fair value $ 424 $ 0   $ 424