Disclosures About Fair Value (Details) Fair Value of Assets and Liabilities on a Recurring Basis - USD ($)	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Assets
Available-for-sale equity securities	$ 22,590,000	$ 31,032,000
Liabilities
Fair value adjustment of contingent consideration	(1,195,000)
Citizens Homes, Inc.
Liabilities
Maximum contingent consideration	$ 6,000,000
Performance period	5 years
Minimum contingent consideration	$ 0
Fair value adjustment of contingent consideration	$ (1,200,000)
Contingent Consideration Liability | Citizens Homes, Inc.
Liabilities
Average discount rate applied	13.50%
Expected volatility rate	19.10%
Entity credit risk	11.00%
Minimum | Contingent Consideration Liability | Citizens Homes, Inc.
Liabilities
Average discount rate applied	13.50%
Maximum | Contingent Consideration Liability | Citizens Homes, Inc.
Liabilities
Average discount rate applied	14.20%
Fair Value, Measurements, Recurring
Liabilities
Contingent consideration	$ 2,707,000	$ 3,902,000
Fair Value, Measurements, Recurring | Continuing Operations
Assets
Available-for-sale equity securities	18,137,000	21,990,000
Available-for-sale debt maturities	4,453,000	6,380,000
Quoted Prices In Active Markets for Identical Assets (Level 1) | Fair Value, Measurements, Recurring | Continuing Operations
Assets
Available-for-sale equity securities	10,685,000	10,892,000
Available-for-sale debt maturities	4,453,000	6,380,000
Significant Other Observable Inputs (Level 2) | Fair Value, Measurements, Recurring | Continuing Operations
Assets
Available-for-sale equity securities	7,452,000	11,098,000
Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring
Liabilities
Contingent consideration	$ 2,707,000	3,902,000
Equity Securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Transfers		$ 5,600,000