Investments - Summary of Investments (Details) - USD ($)	Mar. 31, 2019	Dec. 31, 2018
Investment [Line Items]
Investment securities - fair value	$ 56,362,000	$ 59,271,000
Investment securities - available for sale	0	2,023,000
Parent
Investment [Line Items]
Investment securities - fair value	56,362,000	59,271,000
Investment securities - available for sale	0	2,023,000
Equity method investments	11,051,000	10,573,000
Nonqualified retirement plan assets	7,519,000	6,716,000
Other investments	993,000	975,000
Total investments	$ 75,925,000	$ 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.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
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Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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Investments In Nonqualified Retirement Plan Assets

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