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Commitments and Contingencies (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Commitments and Contingencies Disclosure [Abstract] |  |  |
Lease expiration date | Mar. 31, 2028 |  |
Rent expense | $ 23,348 | $ 21,566 | $ 18,640
Minimum rentals for aggregate lease commitments |  |  |
2019 | 15,200 |  |
2020 | 8,973 |  |
2021 | 5,535 |  |
2022 | 3,592 |  |
2023 | 2,636 |  |
Thereafter | 4,215 |  |
Total | 40,151 |  |
Aggregate residual value at lease expiration for vehicle leases | 14,043 |  |
Guaranteed aggregate residual value at lease expiration for vehicle leases | 8,404 |  |
Liability for the estimated end-of-term loss related to residual value guarantee | $ 243 |  |
Loans, Notes, Trade and Other Receivables Disclosure [Text Block] | 5360 |  |

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- Definition The current carrying amount of the liability for the freestanding or embedded guarantor's obligations under the guarantee or each group of similar guarantees. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 460 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=115931803&loc=d3e12069-110248 + Details
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