Fair Value Measurements - Schedule of Fair Values of Financial Assets and Liabilities Measured at Fair Value (Details) - USD ($)	Dec. 31, 2019	Dec. 31, 2018
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Marketable securities (included in "other assets")	$ 21,639,000	$ 22,660,000
Interest rate swap assets (included in "other assets")		16,859,000
Total assets	21,639,000	39,519,000
Interest rate swap liabilities (included in "other liabilities")		48,000
Total liabilities		48,000
Level 1 [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Marketable securities (included in "other assets")	21,639,000	22,660,000
Total assets	$ 21,639,000	22,660,000
Level 2 [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Interest rate swap assets (included in "other assets")		16,859,000
Total assets		16,859,000
Interest rate swap liabilities (included in "other liabilities")		48,000
Total liabilities		$ 48,000