Summary of Critical and Significant Accounting Policies - Redeemable Noncontrolling Interests (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Accounting Policies [Abstract]
Redeemable noncontrolling interest	$ 35,475	$ 39,206	$ 39,206
Stockholders' Equity Attributable to Noncontrolling Interest [Roll Forward]
Balance at January 1,	35,475	39,206	44,684
Reclassifications due to change in redemption value and other	2,008	1,164	65
Redemptions	(73)	(4,895)	(5,543)
Balance at December 31,	$ 37,410	$ 35,475	$ 39,206