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Disclosures About Fair Value - Fair Value of Assets and Liabilities on a Recurring Basis (Details) - USD ($)
6 Months Ended
Apr. 10, 2014
Jun. 30, 2015
Jun. 30, 2016
Dec. 31, 2015
Assets        
Available-for-sale Securities     $ 23,812,000 $ 22,590,000
Citizens Homes, Inc.        
Liabilities        
Contingent consideration, maximum     6,000,000  
Performance period for achievement of contingent consideration related milestones 5 years      
Contingent consideration, minimum     0  
Contingent Consideration Liability | Citizens Homes, Inc.        
Liabilities        
Discount rate (percentage)   12.70%    
Volatility rate (percentage)   18.60%    
Credit risk (percentage)   11.00%    
Minimum | Contingent Consideration Liability | Citizens Homes, Inc.        
Liabilities        
Discount rate (percentage)   12.70%    
Maximum | Contingent Consideration Liability | Citizens Homes, Inc.        
Liabilities        
Discount rate (percentage)   13.20%    
Fair Value, Measurements, Recurring        
Assets        
Available-for-sale equity securities     19,373,000 18,137,000
Available-for-sale debt securities     4,439,000 4,453,000
Available-for-sale Securities     23,812,000 22,590,000
Liabilities        
Contingent consideration     2,715,000 2,707,000
Fair Value, Measurements, Recurring | Quoted Prices In Active Markets for Identical Assets (Level 1)        
Assets        
Available-for-sale equity securities     11,317,000 10,685,000
Available-for-sale debt securities     4,439,000 4,453,000
Available-for-sale Securities     15,756,000 15,138,000
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2)        
Assets        
Available-for-sale equity securities     8,056,000 7,452,000
Available-for-sale debt securities    
Available-for-sale Securities     8,056,000 7,452,000
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3)        
Liabilities        
Contingent consideration     $ 2,715,000 $ 2,707,000