Equity - Summary of Net Income and Income Tax Benefit Attributable to Non-controlling Interest (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Equity [Abstract]
Net income allocated to non-controlling interest	$ 13,910	$ 9,525	$ 830	$ 21,094
Income tax expense (benefit) allocated to non-controlling interest	692	(1,070)	690	(1,955)
Net income attributable to non-controlling interest	$ 13,218	$ 10,595	$ 140	$ 23,049