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Indebtedness (Narrative) (Details) - USD ($) $ in Thousands | Jan. 13, 2020 | Oct. 16, 2019 | Oct. 15, 2019 | Jan. 02, 2021 | Nov. 06, 2020 | Dec. 13, 2019 | Sep. 03, 2019
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Line of Credit | U.S. revolving credit facility |  |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |  |
Line of Credit Facility, Current Borrowing Capacity |  |  | $ 1,100,000 |  |  |  |
Expansion option to increase credit facility |  |  | $ 400,000 |  |  |  |
Line of Credit | SECT revolving credit facility |  |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |  |
Line of Credit Facility, Current Borrowing Capacity |  |  |  |  |  |  | $ 35,000
Senior Notes | Senior notes 4.25% |  |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |  |
Debt Instrument, Face Amount |  |  |  |  |  | $ 500,000 |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  |  |  | 4.25% |
Senior Notes | Senior notes 5.25% |  |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage | 5.25% |  |  |  |  |  |
Debt Instrument, Redemption Price, Percentage of Principal Amount Redeemed | 101.313% |  |  |  |  |  |
Early Repayment of Senior Debt | $ 300,000 |  |  |  |  |  |
Gain (Loss) on Extinguishment of Debt | $ (3,939) |  |  |  |  |  |
Securitization Program |  |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |  |
Maximum credit facility amount that can borrow |  |  |  |  | $ 80,000 |  |
Percentage of borrowing capacity on the Securitization Program |  | 80.00% |  |  |  |  |
Percentage of borrowing base on the Securitization Program |  | 100.00% |  |  |  |  |
Minimum borrowing requirement for the Securitization Program |  |  |  | $ 53,280 |  |  |

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