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Employee Savings Plan (Details) - USD ($) | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Employee Savings Plan [Abstract] |  |  |
Compensation and Employee Benefit Plans [Text Block] | NOTE 11· Employee Savings PlanThe Company has an Employee Savings Plan (401(k)) in which substantially all employees with more than 30 days of service are eligible to participate. Under this plan, the Company makes matching contributions of up to 4.0% of each participant’s annual compensation. Prior to 2014, the Company’s matching contribution was up to 2.5% of each participant’s annual compensation with an additional discretionary profit-sharing contribution each year, which equaled 1.5% of each eligible employee’s compensation. The Company’s contribution expense to the plan totaled $22.8 million in 2018, $19.6 million in 2017 and $19.3 million in 2016. |  |
Service Period Eligible to Participate for Employee Savings Plan | $ 30 |  |
Defined Contribution Plan, Employer Matching Contribution, Percent of Match | 4.00% |  | 2.50%
Discretionary Profit Sharing Contribution Percentage of Employees Salary | 1.50% |  |
Defined Benefit Plan, Plan Assets, Contributions by Employer | $ 22,800,000 | $ 19,600,000 | $ 19,300,000

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- Definition The entire disclosure for an entity's employee compensation and benefit plans, including, but not limited to, postemployment and postretirement benefit plans, defined benefit pension plans, defined contribution plans, non-qualified and supplemental benefit plans, deferred compensation, share-based compensation, life insurance, severance, health care, unemployment and other benefit plans. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -URI http://asc.fasb.org/topic&trid=2235017 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 712 -URI http://asc.fasb.org/topic&trid=2197446 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 710 -URI http://asc.fasb.org/topic&trid=2127225 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -URI http://asc.fasb.org/topic&trid=2228938 + Details
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- Definition Amount of contribution received by defined benefit plan from employer which increases plan assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(5)(ii) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 6 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e2709-114920 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b)(3) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(5)(iv)(01) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Percentage employer matches of the employee's percentage contribution matched. + References No definition available. + Details
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