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Indebtedness (Narrative) (Details) - USD ($) $ in Thousands | Jun. 28, 2016 | Apr. 15, 2016 | Dec. 31, 2016 | Nov. 21, 2014
--- | --- | --- | --- | ---
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%
Asset-backed Securities, Securitized Loans and Receivables |  |  |  |
Line of Credit Facility |  |  |  |
Maximum credit facility amount that can borrow |  | $ 120,000 |  |
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 |  |  | $ 96,000 |

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