Fair Value Measurements - Schedule of Fair Values of Financial Assets and Liabilities Measured at Fair Value (Details) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Marketable securities	$ 21,564	$ 22,393
Interest rate swap assets (included in "other assets")	730	139
Total assets	22,294	22,532
Interest rate swap liabilities	1,819	22,446
Total liabilities	1,819	22,446
Level 1 [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Marketable securities	21,564	22,393
Total assets	21,564	22,393
Level 2 [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Interest rate swap assets (included in "other assets")	730	139
Total assets	730	139
Interest rate swap liabilities	1,819	22,446
Total liabilities	$ 1,819	$ 22,446