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Summary of Significant Accounting Policies (Details 3) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Warranty activity |  |  |
Warranty reserves, beginning of the year | $ 5,243 | $ 5,486 | $ 6,001
Accruals for warranties issued during the year | 4,134 | 3,837 | 4,533
Reductions related to pre-existing warranties | (2,748) | (3,320) | (3,428)
Standard Product Warranty Accrual, Additions from Business Acquisition | 0 | 249 | 0
Warranties paid | (649) | (942) | (1,637)
Other (principally foreign currency translation) | (60) | (67) | 17
Warranty reserves, beginning of the year | 5,920 | 5,243 | 5,486
Self-insurance |  |  |
Loss Contingencies [Line Items] |  |  |
Insurance expense from continuing operations | 15,400 | 13,500 | 16,000
Decrease in pre-tax insurance expense due to retrospective insurance reserve adjustments from continuing operations | 1,500 | 2,000 | $ 1,500
Liabilities for asserted and unasserted claims | 28,700 | 60,300 |
Liabilities covered by insurance carriers | $ 3,700 | $ 34,200 |

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