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1. Significant Accounting Policies Revenue Recognition (Details) - USD ($) $ in Thousands | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2018 | Jan. 01, 2018 | Dec. 31, 2017
Disaggregation of Revenue [Line Items] |  |  |
Retained earnings | $ 3,722,073 |  | $ 1,830,439
Revenue Allocation Percent To Lease Elements | 5.00% |  |
Deferred Revenue | $ 37,300 |  | $ 36,700
Deferred Revenue, Period Increase (Decrease) | 28,000 |  |
Deferred Revenue, Revenue Recognized | $ 27,400 |  |
Accounting Standards Update 2014-09 [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Retained earnings |  | $ 100 |

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