Income Taxes - Schedule of U.S. and Non-U.S. Components of Income (Loss) Before Income Tax Expense (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
U.S. and non-U.S. components of income (loss) before income tax expense:
U.S.	$ 237,920	$ 279,038	$ 172,401
Non-U.S.	532	71,313	(5,727)
Income (loss) before income taxes	$ 238,452	$ 350,351	$ 166,674