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Income Taxes, Gross Unrecognized Tax Benefits (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Gross Unrecognized Tax Benefits [Roll Forward] |  |  |
Beginning balance of unrecognized tax benefits | $ 68,301 | $ 78,014 | $ 66,999
Decrease for prior period tax positions | (867) | (12,814) | 0
Increase for prior period tax positions | 736 | 0 | 1,520
Increase for current period tax positions | 1,614 | 3,101 | 9,495
Ending balance of unrecognized tax benefits | 69,784 | $ 68,301 | $ 78,014
Unrecognized tax benefits that could impact effective tax rate, if recognized | 21,700 |  |
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=116821951&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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