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Summary of Significant Accounting Policies - Income Taxes (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Accounting Policies [Abstract]
Total amount of unrecognized tax benefits relating to uncertain tax positions	$ 33,219	$ 40,878	$ 41,110	$ 36,229
Unrecognized tax benefits, decrease from settlements	(3,300)
Unrecognized tax benefits, decrease from expiration of statutes of limitations	(8,700)
Increase (decrease) in the total amount of unrecognized tax benefits relating to uncertain tax positions	(7,700)
Unrecognized tax benefits, increase from current period tax positions	4,398	7,708	6,231
Increase in reserves for uncertain tax positions taken in prior years	0	$ 1,200	$ 9,377
Reasonably possible reduction to the balance of unrecognized tax benefits in succeeding 12 months (up to)	$ 11,900

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Unrecognized Tax Benefits, Decrease Resulting From Lapse Of Applicable Statute Of Limitations

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Amount of decrease reasonably possible in the next twelve months for the unrecognized tax benefit.

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