Investments - Summary of Investments (Details) - USD ($)	Jun. 30, 2019	Dec. 31, 2018
Investment [Line Items]
Investment securities - fair value	$ 53,351,000	$ 59,271,000
Investment securities - available for sale	0	2,023,000
Parent
Investment [Line Items]
Investment securities - fair value	53,351,000	59,271,000
Investment securities - available for sale	0	2,023,000
Equity method investments	11,026,000	10,573,000
Nonqualified retirement plan assets	7,852,000	6,716,000
Other investments	1,167,000	975,000
Total investments	$ 73,396,000	$ 79,558,000

Line items represent reporting concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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