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Accrued Liabilities (Tables) | 9 Months Ended
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Sep. 30, 2018
Accrued Liabilities, Current [Abstract] |
Schedule of accrued liabilities | Accrued liabilities consisted of the following (in thousands):
﻿ | September 30, 2018 |  | December 31, 2017
﻿ |  |  |  |  |
Accrued expenses | $ | 61,301 |  |  | $ | 64,430 |
Accrued employee compensation and related expenses | 87,184 |  |  | 102,944 |
Accrued taxes | 28,082 |  |  | 29,389 |
Accrued customer incentives and refund obligations (Notes 2 and 3) | 61,864 |  |  | 56,655 |
Total accrued liabilities | $ | 238,431 |  |  | $ | 253,418 |
Schedule of other long-term liabilities | Other long-term liabilities consisted of the following (in thousands): ໿ ໿
﻿ | September 30, 2018 |  | December 31, 2017
Accrued taxes | $ | 63,385 |  |  | $ | 66,506 |
Accrued customer incentives (Note 2) | — |  |  | 12,956 |
Other accrued long-term expenses | 18,109 |  |  | 16,256 |
Total other long-term liabilities | $ | 81,494 |  |  | $ | 95,718 |

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