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Acquisition of Citizens Homes - Narrative (Details) - Citizens Homes, Inc. - USD ($)
3 Months Ended 6 Months Ended
Apr. 10, 2014
Jun. 30, 2014
Jun. 30, 2014
Jun. 30, 2015
Dec. 31, 2014
Business Acquisition [Line Items]          
Contingent consideration, maximum $ 6,000,000        
Contingent consideration       $ 3,737,000 $ 3,902,000
Performance period for achievement of contingent consideration related milestones 5 years        
Contingent consideration, minimum $ 0        
Acquisition costs   $ 180,000 $ 640,000    
Contingent Consideration Liability          
Business Acquisition [Line Items]          
Discount rate (percentage) 12.70%        
Volatility rate (percentage) 22.30%        
Credit risk (percentage) 9.17%        
Contingent Consideration Liability | Minimum          
Business Acquisition [Line Items]          
Discount rate (percentage) 12.50%        
Contingent Consideration Liability | Maximum          
Business Acquisition [Line Items]          
Discount rate (percentage) 13.50%