CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Statement Of Financial Position [Abstract]
Finite-lived intangible assets, accumulated amortization (in dollars)	$ 68,985	$ 62,543
Below market lease, accumulated amortization (in dollars)	$ 16,291	$ 15,177
Common stock, par value (in dollars per share)	$ 0.0001	$ 0.0001
Common stock, shares authorized	45,000,000	45,000,000
Common stock, shares issued	38,454,782	37,545,790
Common stock, shares outstanding	38,454,782	37,545,790
Preferred stock, par value (in dollars per share)	$ 0.0001	$ 0.0001
Preferred stock, shares authorized	4,000,000	4,000,000