Earnings Per Share and Equity - Basic and Diluted Loss Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Basic and Diluted
Allocation of Net Income	$ 14,827	$ 10,327
Class A common stock
Basic and Diluted
Weighted-Average Shares Outstanding (shares)	115,497,094	112,113,960
Allocation of Net Income	$ 11,654	$ 8,110
Basic and diluted earnings per share (in dollars per share)	$ 0.10	$ 0.07
Class C common stock
Basic and Diluted
Weighted-Average Shares Outstanding (shares)	31,879,027	31,441,399
Allocation of Net Income	$ 3,173	$ 2,217
Basic and diluted earnings per share (in dollars per share)	$ 0.10	$ 0.07