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Debt and Financing Arrangements (Tables) | 12 Months Ended
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Dec. 31, 2018
Debt Disclosure [Abstract] |
Summary of Unsecured Credit Facility | Rates for the years ended December 31, 2018 and 2017 were as follows (includes bank debt and interest rate swaps):
|  | 2018 |  |  | 2017 |
Weighted average rates |  | 3.08% |  |  | 2.72% |
Range of effective rates |  | 2.12% - 5.50% |  |  | 2.19% - 4.75% |
Summary of Recognized Interest Expense | For the years ended December 31, 2018, 2017 and 2016, we recognized interest expense as follows (in thousands):
|  | 2018 |  |  | 2017 |  |  | 2016 |
Credit facility (1) |  | $ | 6,645 |  |  | $ | 6,675 |  |  | $ | 6,585 |
2006 Notes (2) |  |  | — |  |  |  | — |  |  |  | 8 |
Balance at December 31 |  | $ | 6,645 |  |  | $ | 6,675 |  |  | $ | 6,593 |
(1) | Components of interest expense related to the credit facility include amortization of deferred financing costs, commitment fees and line of credit fees.
(2) | We redeemed the remaining 3.125% Convertible Senior Subordinated Notes during the second quarter of 2016 under an optional early redemption provision.

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- Definition Tabular disclosure of short-term or long-term contractual arrangements with lenders, including letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(e),(f)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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