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Employee Benefit Plans (Details 2) - Pension Plan - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | --- | ---
Employee benefits plans |  |  |
Fair value of plan assets | $ 107,862 | $ 126,013 | $ 116,725
Funded pension plan assets, by asset category (as a percent) | 100.00% | 100.00% |
Total investments, excluding investments valued at NAV |  |  |
Employee benefits plans |  |  |
Fair value of plan assets | $ 93,518 | $ 100,672 |
Quoted Prices in Active Markets for Identical Assets (Level 1) |  |  |
Employee benefits plans |  |  |
Fair value of plan assets | 93,518 | 100,672 |
Significant Other Observable Inputs (Level 2) |  |  |
Employee benefits plans |  |  |
Fair value of plan assets | 0 | 0 |
Significant Unobservable Inputs (Level 3) |  |  |
Employee benefits plans |  |  |
Fair value of plan assets | 0 | 0 |
Equity securities |  |  |
Employee benefits plans |  |  |
Fair value of plan assets | $ 71,384 | $ 80,191 |
Funded pension plan assets, by asset category (as a percent) | 66.00% | 64.00% |
Equity securities | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |  |
Employee benefits plans |  |  |
Fair value of plan assets | $ 71,384 | $ 80,191 |
Equity securities | Significant Other Observable Inputs (Level 2) |  |  |
Employee benefits plans |  |  |
Fair value of plan assets | 0 | 0 |
Equity securities | Significant Unobservable Inputs (Level 3) |  |  |
Employee benefits plans |  |  |
Fair value of plan assets | 0 | 0 |
Debt securities |  |  |
Employee benefits plans |  |  |
Fair value of plan assets | $ 22,134 | $ 20,481 |
Funded pension plan assets, by asset category (as a percent) | 21.00% | 16.00% |
Debt securities | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |  |
Employee benefits plans |  |  |
Fair value of plan assets | $ 22,134 | $ 20,481 |
Debt securities | Significant Other Observable Inputs (Level 2) |  |  |
Employee benefits plans |  |  |
Fair value of plan assets | 0 | 0 |
Debt securities | Significant Unobservable Inputs (Level 3) |  |  |
Employee benefits plans |  |  |
Fair value of plan assets | 0 | 0 |
Other |  |  |
Employee benefits plans |  |  |
Fair value of plan assets | $ 14,344 | $ 25,341 |
Funded pension plan assets, by asset category (as a percent) | 13.00% | 20.00% |
Other | NAV |  |  |
Employee benefits plans |  |  |
Fair value of plan assets | $ 14,344 | $ 25,341 |

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- Definition Amount of asset segregated and restricted to provide benefit under defined benefit plan. Asset includes, but is not limited to, stock, bond, other investment, earning from investment, and contribution by employer and employee. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(iv)(01) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(iv)(01) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(ii) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 Reference 4: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=112275985&loc=d3e4179-114921 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 Reference 6: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(ii) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 + Details
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