Disclosures About Fair Value - Fair Value of Assets and Liabilities on a Recurring Basis (Details) - USD ($)	9 Months Ended
	Sep. 30, 2016	Dec. 31, 2015
Assets
Available-for-sale Securities	$ 24,870,000	$ 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
Growth rate	4.50%
Cost inflation	1.50%
Fair Value, Measurements, Recurring
Assets
Available-for-sale equity securities	$ 20,470,000	18,137,000
Available-for-sale debt securities	4,400,000	4,453,000
Available-for-sale Securities	24,870,000	22,590,000
Liabilities
Contingent consideration	307,000	2,707,000
Fair Value, Measurements, Recurring | Quoted Prices In Active Markets for Identical Assets (Level 1)
Assets
Available-for-sale equity securities	12,611,000	10,685,000
Available-for-sale debt securities	4,400,000	4,453,000
Available-for-sale Securities	17,011,000	15,138,000
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2)
Assets
Available-for-sale equity securities	7,859,000	7,452,000
Available-for-sale debt securities
Available-for-sale Securities	7,859,000	7,452,000
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3)
Liabilities
Contingent consideration	$ 307,000	$ 2,707,000