Net Loss Per Share (Summary of Basic and Diluted Net Loss Per Share Computation) (Details) - USD ($) $ / shares in Units, $ in Thousands		12 Months Ended
		Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Earnings Per Share [Abstract]
Net loss attributable to stockholders		$ (92,942)	$ (78,781)	$ (88,087)
Basic weighted-average shares outstanding (in shares)	[1]	100,534,438	100,312,245	100,093,694
Diluted weighted-average shares outstanding (in shares)	[1]	100,534,438	100,312,245	100,093,694
Basic net loss per share (in usd per share)	[1]	$ (0.92)	$ (0.79)	$ (0.88)
Diluted net loss per share (in usd per share)	[1]	$ (0.92)	$ (0.79)	$ (0.88)

[1] Retroactively adjusted for the effects of the Stock Dividends (see Note 1).