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Income Taxes, Gross Unrecognized Tax Benefits (Details) - USD ($) $ in Thousands | 12 Months Ended
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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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- Definition Amount of unrecognized tax benefits. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 45 -Paragraph 10B -URI http://asc.fasb.org/extlink&oid=84176650&loc=SL37586934-109318 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15A -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=84230637&loc=SL6600010-109319 + Details
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