Summary of Significant Accounting Policies - Income Taxes (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Accounting Policies [Abstract]
Total amount of unrecognized tax benefits relating to uncertain tax positions	$ 40,878	$ 41,110	$ 36,229	$ 35,240
Increase (decrease) in the total amount of unrecognized tax benefits relating to uncertain tax positions	(200)
Decrease resulted primarily from a favorable settlements related to certain non-U.S. income tax obligations of an acquired business and the expiration of U.S. state income tax statutes	9,100
Unrecognized tax benefits, increase from current period tax positions	7,708	6,231	7,040
Increase in reserves for uncertain tax positions taken in prior years	1,200	$ 9,377	$ 3,372
Reasonably possible reduction to the balance of unrecognized tax benefits in succeeding 12 months (up to)	$ 6,300