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Financial Commitments (Summary Of Interest Expense As Reported In The Condensed Consolidated Statements of Income) (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2019 | Mar. 31, 2018
Debt Instrument [Line Items] |  |  |
Interest on debt |  | $ 13,251 | $ 12,138
Other interest |  | 574 | 757
Total non-cash interest expense | [1] | 3,174 | 2,927
Total interest expense |  | 16,425 | 15,065
Convertible Notes [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Interest on debt |  | 1,438 | 1,438
Total non-cash interest expense | [1] | $ 2,608 | 2,376
Effective interest rates |  | 9.39% |
2017 Senior Notes [Member] | Senior Notes [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Interest on debt |  | $ 8,594 | 8,594
Total non-cash interest expense | [1] | $ 205 | 191
Effective interest rates |  | 7.13% |
2017 Credit Facility [Member] | Credit Facility [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Interest on debt |  | $ 2,645 | 1,349
Total non-cash interest expense | [1] | $ 361 | $ 360
[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, 2019.

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