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v3.19.3.a.u2

1. Significant Accounting Policies Property, Plant and Equipment (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Property, Plant and Equipment [Line Items] |  |  |
Restricted investments | $ 5,560 | $ 5,560 |
Retained earnings | 5,470,779 | 3,722,073 |
Other assets | 79,636 | 70,298 |
Prepaid Taxes | 5,400 |  |
Equipment | 1,015,359 | 970,081 |
Deferred income taxes | 997,787 | 553,239 |
Income Tax Expense (Benefit) | $ (502,406) | $ (147,045) | $ 24,444
Minimum [Member] | Software [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Property, Plant and Equipment, Useful Life | 3 years |  |
Minimum [Member] | Building and Building Improvements [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Property, Plant and Equipment, Useful Life | 10 years |  |
Minimum [Member] | Reagent Rental Equipment [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Property, Plant and Equipment, Useful Life | 1 year |  |
Minimum [Member] | Equipment [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Property, Plant and Equipment, Useful Life | 3 years |  |
Maximum [Member] | Software [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Property, Plant and Equipment, Useful Life | 12 years |  |
Maximum [Member] | Building and Building Improvements [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Property, Plant and Equipment, Useful Life | 39 years |  |
Maximum [Member] | Reagent Rental Equipment [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Property, Plant and Equipment, Useful Life | 5 years |  |
Maximum [Member] | Equipment [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Property, Plant and Equipment, Useful Life | 12 years |  |

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