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Accrued Liabilities (Tables) | 12 Months Ended
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Dec. 31, 2017
Accrued Liabilities [Abstract] |
Accrued Liabilities | Accrued liabilities at December 31 were as follows (in thousands):
| 2017 |  | 2016
Interest | $ | 20,060 |  |  | $ | 21,742 |
Customer deposits | 29,236 |  |  | 16,707 |
Commissions | 8,341 |  |  | 9,144 |
Warranty | 10,587 |  |  | 10,548 |
Accrued dividend | 42,921 |  |  | 36,077 |
Rebates | 29,996 |  |  | 19,414 |
Billings in excess of cost | 23,284 |  |  | 12,381 |
Other | 102,149 |  |  | 93,326 |
| $ | 266,574 |  |  | $ | 219,339 |

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