Income Taxes, Gross Unrecognized Tax Benefits (Details) - USD ($)	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Gross Unrecognized Tax Benefits [Roll Forward]
Beginning balance of unrecognized tax benefits	$ 27,365,000	$ 23,964,000	$ 10,872,000
Decrease for prior period tax positions	0	(1,653,000)	0
Increase for prior period tax positions	215,000	0	9,821,000
Increase for current period tax positions	23,677,000	5,054,000	3,271,000
Ending balance of unrecognized tax benefits	51,257,000	$ 27,365,000	$ 23,964,000
Unrecognized tax benefits that would reduce effective tax rate	33,300,000
Interest and penalties on unrecognized tax benefits	$ 0