Earnings per Share - Reconciliation (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Reconciliation of net income before minority interest to net income available for common stockholders
Income (loss) before income taxes and noncontrolling interest	$ 696,363	$ 113,164	$ 179,591
Provision for income taxes	76,171	94,266	21,251
Net income	620,192	18,898	158,340
Noncontrolling interest	(330,751)	(15,959)	(125,360)
Net income available for common stockholders	$ 289,441	$ 2,939	$ 32,980