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Debt (Tables) | 6 Months Ended
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Jun. 30, 2018
Debt Disclosure [Abstract] |
Summary of Outstanding Debt | The Company had the following outstanding debt at June 30, 2018 and December 31, 2017 (in thousands):
|  | June 30, 2018 |  |  | December 31, 2017 |
Foreign subsidiary lines of credit |  | $ | 499 |  |  | $ | 273 |
Senior unsecured notes—Series D - 3.22%, due March 2018 |  |  | — |  |  |  | 100,000 |
Total notes payable and debt, current |  |  | 499 |  |  |  | 100,273 |
Senior unsecured notes—Series B - 5.00%, due February 2020 |  |  | 100,000 |  |  |  | 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 |
Senior unsecured notes—Series K - 3.44%, due May 2026 |  |  | 160,000 |  |  |  | 160,000 |
Credit agreement |  |  | 590,000 |  |  |  | 1,300,000 |
Unamortized debt issuance costs |  |  | (2,049 | ) |  |  | (2,499 | )
Total long-term debt |  |  | 1,147,951 |  |  |  | 1,897,501 |
Total debt |  | $ | 1,148,450 |  |  | $ | 1,997,774 |
* | 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 bore interest at a 3-month LIBOR for that floating rate interest period plus 1.45%.

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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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