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Indebtedness (Narrative) (Details) - USD ($) $ in Thousands | Oct. 23, 2017 | Jun. 28, 2016 | Mar. 31, 2018
--- | --- | --- | ---
Revolving Credit Facility |  |  |
Line of Credit Facility |  |  |
Line of Credit Facility, Current Borrowing Capacity |  | $ 1,100,000 |
Expansion option to increase credit facility |  | $ 200,000 |
Senior Notes |  |  |
Line of Credit Facility |  |  |
Debt Instrument, Face Amount |  |  | $ 300,000
Debt Instrument, Interest Rate, Stated Percentage |  |  | 5.25%
Securitization Program |  |  |
Line of Credit Facility |  |  |
Maximum credit facility amount that can borrow | $ 130,000 |  |
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 |  |  | $ 104,000

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