Noncontrolling Interests - Schedule of Noncontrolling Interests (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2019	Dec. 31, 2018
Stockholders' Equity Attributable to Noncontrolling Interest [Roll Forward]
Beginning balance	$ 1,182
Issuance of limited partnership units	3,904	$ 1,185
Distributions to noncontrolling interest	(47)	(70)
Net loss allocation	(1,647)	(3,287)
Other comprehensive loss		(952)
Ending balance	5,032	1,182
Non- controlling Interests
Stockholders' Equity Attributable to Noncontrolling Interest [Roll Forward]
Beginning balance	1,182	76
Issuance of limited partnership units	3,904	1,185
Distributions to noncontrolling interest	(47)	(70)
Net loss allocation	(7)	(6)
Other comprehensive loss	0	(3)
Ending balance	$ 5,032	$ 1,182