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Income Taxes, Gross Unrecognized Tax Benefits (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Gross Unrecognized Tax Benefits [Roll Forward]      
Beginning balance of unrecognized tax benefits $ 66,999 $ 51,257 $ 27,365
Settlement of prior period tax positions 0 (4,033) 0
Increase for prior period tax positions 1,520 7,928 215
Increase for current period tax positions 9,495 11,847 23,677
Ending balance of unrecognized tax benefits 78,014 $ 66,999 $ 51,257
Unrecognized tax benefits that could impact effective tax rate, if recognized 63,600    
Interest and penalties on unrecognized tax benefits $ 0