Schedule II - Valuation and Qualifying Accounts (Details) - Deferred tax asset valuation allowance - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at beginning of period	$ 126,562	$ 16,612	$ 0
Charged to costs and expenses	18,039	14,771	(3,911)
Charged to other accounts	70,252	95,179	20,523
Reductions	0	0	0
Balance at end of period	$ 214,853	$ 126,562	$ 16,612