Fair Value Measurements - Schedule of Fair Values of Financial Assets and Liabilities Measured at Fair Value (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Marketable securities (included in "other assets")	$ 23,594	$ 22,660
Interest rate swap assets (included in "other assets")	579	16,859
Total assets	24,173	39,519
Interest rate swap liabilities (included in "other liabilities")	8,139	48
Total liabilities	8,139	48
Level 1 [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Marketable securities (included in "other assets")	23,594	22,660
Total assets	23,594	22,660
Level 2 [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Interest rate swap assets (included in "other assets")	579	16,859
Total assets	579	16,859
Interest rate swap liabilities (included in "other liabilities")	8,139	48
Total liabilities	$ 8,139	$ 48