Fair Value Measurements - Schedule of Fair Values of Financial Assets and Liabilities Measured at Fair Value (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Marketable securities (included in "other assets")	$ 27,976	$ 22,660
Interest rate swap assets (included in "other assets")	9,074	16,859
Total assets	37,050	39,519
Interest rate swap liabilities (included in "other liabilities")	1,289	48
Total liabilities	1,289	48
Level 1 [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Marketable securities (included in "other assets")	27,976	22,660
Total assets	27,976	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")	9,074	16,859
Total assets	9,074	16,859
Interest rate swap liabilities (included in "other liabilities")	1,289	48
Total liabilities	$ 1,289	$ 48