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Condensed Financial Information - Narrative (Details) - Revolving Credit Facility - USD ($)
Jun. 30, 2017
Aug. 18, 2015
Condensed Financial Statements Captions [Line Items]    
Availability under the credit facility $ 64,200,000  
Maximum borrowing capacity   $ 180,000,000
Availability to be maintained under credit facility before restriction on investments, percentage   20.00%
Parent Company    
Condensed Financial Statements Captions [Line Items]    
Availability under the credit facility 64,200,000  
Maximum borrowing capacity $ 180,000,000  
Availability to be maintained under credit facility before restriction on investments, percentage 20.00%