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Financial Commitments (Summary Of Interest Expense As Reported In The Consolidated Statements of Operations) (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2020 | Mar. 31, 2019
Interest on debt |  | $ 12,950 | $ 13,251
Other interest |  | 504 | 574
Total non-cash interest expense | [1] | 3,486 | 3,174
Total interest expense |  | 16,436 | 16,425
Convertible Notes [Member] |  |  |
Interest on debt |  | 1,437 | 1,438
Total non-cash interest expense | [1] | $ 2,864 | 2,608
Effective interest rates |  | 9.39% |
2017 Senior Notes [Member] | Senior Notes [Member] |  |  |
Interest on debt |  | $ 8,594 | 8,594
Total non-cash interest expense | [1] | $ 220 | 205
Effective interest rates |  | 7.13% |
2017 Credit Facility [Member] | Revolving Credit Facility [Member] |  |  |
Interest on debt |  | $ 2,415 | 2,645
Total non-cash interest expense | [1] | $ 402 | $ 361
[1] | The combination of cash and non-cash interest expense produces effective interest rates that are higher than contractual rates. Accordingly, the effective interest rates for the 2017 Senior Notes and the Convertible Notes were 7.13% and 9.39%, respectively, for the three months ended March 31, 2020.

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