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Income Taxes, Gross Unrecognized Tax Benefits (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Gross Unrecognized Tax Benefits [Roll Forward]
Beginning balance of unrecognized tax benefits	$ 78,014	$ 66,999	$ 51,257
Settlement of prior period tax positions	0	0	(4,033)
Decrease for prior period tax positions	(12,814)	0	0
Increase for prior period tax positions	0	1,520	7,928
Increase for current period tax positions	3,101	9,495	11,847
Ending balance of unrecognized tax benefits	68,301	$ 78,014	$ 66,999
Unrecognized tax benefits that could impact effective tax rate, if recognized	55,500
Interest and penalties on unrecognized tax benefits	$ 0

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Amount of unrecognized tax benefits.

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