Noncontrolling Interest in Operating Partnership - Schedule of OP Unit Activity (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018
Noncontrolling Interest [Abstract]
OP Units redeemed for common stock (in units)	210,501	10,000
OP Units redeemed for cash (in units)	0	30,000
Cash paid for OP Units redeemed	$ 0	$ 2,558
OP Units issued in conjunction with acquisitions (in units)	0	21,768
Value of OP Units issued in conjunction with acquisitions	$ 0	$ 1,877
OP Units issued upon redemption of Series C Units (in units)	270,709	0