Fair Value Measurements - Schedule of Fair Values of Financial Assets and Liabilities Measured at Fair Value (Details) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Marketable securities	$ 25,617	$ 22,393
Interest rate swap assets (included in "other assets")	2,952	139
Total assets	28,569	22,532
Interest rate swap liabilities	0	22,446
Total liabilities		22,446
Level 1 [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Marketable securities	25,617	22,393
Total assets	25,617	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")	2,952	139
Total assets	$ 2,952	139
Interest rate swap liabilities		22,446
Total liabilities		$ 22,446