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Debt (Tables) | 12 Months Ended
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Dec. 31, 2017
Debt [Abstract] |
Schedule of Outstanding Debt | T he Company had the following outstanding debt a t December 31, 2017 and 2016 (in thousands):
|  |  | December 31,
|  |  | 2017 |  | 2016
Foreign subsidiary lines of credit |  | $ | 273 |  | $ | 297
Senior unsecured notes - Series D - 3.22%, due March 2018 |  |  | 100,000 |  |  | -
Credit agreement |  |  | - |  |  | 125,000
| Total notes payable and debt, current |  |  | 100,273 |  |  | 125,297
Senior unsecured notes - Series B - 5.00%, due February 2020 |  |  | 100,000 |  |  | 100,000
Senior unsecured notes - Series D - 3.22%, due March 2018 |  |  | - |  |  | 100,000
Senior unsecured notes - Series E - 3.97%, due March 2021 |  |  | 50,000 |  |  | 50,000
Senior unsecured notes - Series F - 3.40%, due June 2021 |  |  | 100,000 |  |  | 100,000
Senior unsecured notes - Series G - 3.92%, due June 2024 |  |  | 50,000 |  |  | 50,000
Senior unsecured notes - Series H - floating rate*, due June 2024 |  |  | 50,000 |  |  | 50,000
Senior unsecured notes - Series I - 3.13%, due May 2023 |  | 50,000 |  |  | 50,000
Senior unsecured notes - Series J - floating rate**, due May 2024 |  | 40,000 |  |  | 40,000
Senior unsecured notes - Series K - 3.44%, due May 2026 |  | 160,000 |  |  | 160,000
Credit agreement |  |  | 1,300,000 |  |  | 1,005,000
Unamortized debt issuance costs |  |  | (2,499) |  |  | (3,034)
| Total long-term debt |  |  | 1,897,501 |  |  | 1,701,966
Total debt |  | $ | 1,997,774 |  | $ | 1,827,263
* Series H senior unsecured notes bear interest at a 3-month LIBOR for that floating rate interest period plus 1.25%.
** Series J senior unsecured notes bear interest at a 3-month LIBOR for that floating rate interest period plus 1.45%.
Schedule of Debt Maturities | Annual maturities of debt outstanding a t December 31, 2017 are as follows (in thousands):
|  |  | Total
2018 |  | $ | 100,273
2019 |  |  | -
2020 |  |  | 100,000
2021 |  |  | 150,000
2022 |  |  | 1,300,000
Thereafter |  |  | 350,000
| Total |  | $ | 2,000,273

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- Definition Tabular disclosure of information pertaining to short-term and long-debt instruments or arrangements, including but not limited to identification of terms, features, collateral requirements and other information necessary to a fair presentation. + References No definition available. + Details
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- Definition Tabular disclosure of the combined aggregate amount of maturities and sinking fund requirements for all long-term borrowings for each of the five years following the date of the latest balance sheet date presented. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6802200&loc=d3e1835-112601 + Details
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