Nature of Business and Accounting Policies - Equity Investments (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Jan. 01, 2019	Jan. 01, 2018	Jan. 01, 2017
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cumulative effect adjustment for adoption of new accounting guidance			$ 40,310	$ (9,229)	$ 0
Unrealized gains to other (expense) income, net	$ 132,500	$ 2,600
Accumulated Deficit
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cumulative effect adjustment for adoption of new accounting guidance			$ 40,310	(33,349)	$ 9,371
Accounting standards update 2016-01, financial instruments | Accumulated Deficit
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cumulative effect adjustment for adoption of new accounting guidance				$ 25,100