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Employee Benefits (Details) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 USD ($) Employee shares | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($)
Defined Contribution Plans [Abstract] |  |  |
U.S defined contribution | $ 9,080 | $ 8,928 | $ 9,153
Employer discretionary contribution amount | 300 | 300 | 600
Employee Stock Ownership Plan (ESOP), Debt Structure [Abstract] |  |  |
Provision for expense in connection with ESOP | 2,500 | 2,600 | 2,200
Net periodic benefit cost | $ (25) | (262) | (653)
Postretirement Medical Benefits [Abstract] |  |  |
Number of former union employees covered by the plan | Employee | 16 |  |
Supplemental Executive Retirement Plan [Member] |  |  |
Employee Stock Ownership Plan (ESOP), Debt Structure [Abstract] |  |  |
Benefit obligation outstanding | $ 0 | 0 |
Net periodic benefit cost | $ 0 | $ 0 | $ 0
Employee Stock Ownership Plan and Trust (ESOP) [Member] |  |  |
Employee Stock Ownership Plan (ESOP), Debt Structure [Abstract] |  |  |
Additional shares contributed to ESOP (in shares) | shares | 49,100 |  |
Shares released from trust (in shares) | shares | 49,100 |  |
Total remaining balance of shares in the ESOP (in shares) | shares | 200 |  |

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- Definition Amount of net periodic benefit cost (credit) for defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 6 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e2709-114920 Reference 2: 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=118257860&loc=d3e4179-114921 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 + Details
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- Definition Amount of cost for defined contribution plan. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 70 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=49170846&loc=d3e28014-114942 + Details
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