Income Taxes, Gross Unrecognized Tax Benefits (Details) - USD ($)	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Gross Unrecognized Tax Benefits [Roll Forward]
Beginning balance of unrecognized tax benefits	$ 51,257,000	$ 27,365,000	$ 23,964,000
Settlement of prior period tax positions	(4,033,000)	0	0
Decrease for prior period tax positions	0	0	(1,653,000)
Increase for prior period tax positions	7,928,000	215,000	0
Increase for current period tax positions	11,847,000	23,677,000	5,054,000
Ending balance of unrecognized tax benefits	66,999,000	$ 51,257,000	$ 27,365,000
Unrecognized tax benefits that would reduce effective tax rate	46,400,000
Interest and penalties on unrecognized tax benefits	$ 0