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Debt and Financing Arrangements (Tables) | 12 Months Ended
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Dec. 31, 2017
Debt Disclosure [Abstract] |
Summary of Unsecured Credit Facility | Rates for the years ended December 31, 2017 and 2016 were as follows (includes bank debt and interest rate swaps):
|  | 2017 |  |  | 2016 |
Weighted average rates |  | 2.72% |  |  | 2.43% |
Range of effective rates |  | 2.19% - 4.75% |  |  | 1.82% - 3.75% |
Summary of Recognized Interest Expense | For the years ended December 31, 2017, 2016 and 2015, we recognized interest expense as follows (in thousands):
|  | 2017 |  |  | 2016 |  |  | 2015 |
Credit facility (1) |  | $ | 6,675 |  |  | $ | 6,585 |  |  | $ | 4,320 |
2010 Notes (2) |  |  | — |  |  |  | — |  |  |  | 4,559 |
2006 Notes (3) |  |  | — |  |  |  | 8 |  |  |  | 23 |
Balance at December 31 |  | $ | 6,675 |  |  | $ | 6,593 |  |  | $ | 8,902 |
(1) | Components of interest expense related to the credit facility include amortization of deferred financing costs, commitment fees and line of credit fees.
(2) | The 2010 Notes matured on October 1, 2015 and were settled with funds available under the credit facility. We settled $48.4 million of the outstanding principal amount plus a premium conversion value over par value, based on a cash averaging period, for a total of $71.8 million. Prior to the October 1, 2015 maturity date, we early retired $49.3 million of the 2010 Notes, in two privately negotiated transactions during the second quarter of 2015, with shares of our common stock and cash consideration.
(3) | We redeemed the remaining 3.125% Convertible Senior Subordinated Notes (the “2006 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://www.xbrl.org/2003/role/presentationRef -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://www.xbrl.org/2003/role/presentationRef -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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