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Significant Accounting Policies (Detail Textuals 1) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Significant Accounting Policies [Line Items]
Depreciation method used for property, plant and equipment	straight-line basis
Goodwill	$ 32,150	$ 32,150
Advertising expenses	$ 2,220,000	$ 1,696,000	$ 1,296,000
Defined benefit pension plan eligibility criteria	defined benefit pension plan that provides monthly benefits upon retirement at age 65 to eligible employees with at least one year of service prior to 2002.
Statutory federal income tax rate	21.00%	35.00%	35.00%
Discrete tax benefit adjustment		$ 19,300
Earliest tax year
Significant Accounting Policies [Line Items]
Statutory federal income tax rate	35.00%
Latest tax year
Significant Accounting Policies [Line Items]
Statutory federal income tax rate	21.00%
Operating equipment
Significant Accounting Policies [Line Items]
Estimated useful lives of the assets	3 to 20 years
Buildings and leasehold improvements
Significant Accounting Policies [Line Items]
Estimated useful lives of the assets	15 to 39 years or the life of the lease
Furniture and fixtures
Significant Accounting Policies [Line Items]
Estimated useful lives of the assets	5 to 7 years
Software
Significant Accounting Policies [Line Items]
Estimated useful lives of the assets	5 years
Vehicles
Significant Accounting Policies [Line Items]
Estimated useful lives of the assets	3 to 5 years

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Amount charged to advertising expense for the period, which are expenses incurred with the objective of increasing revenue for a specified brand, product or product line.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 720
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Description of defined benefit pension and other postretirement plans. Includes, but is not limited to, employee group covered, type of benefit formula, type of benefits, cost sharing arrangement, funding policy, type of assets held, significant nonbenefit liabilities and information pertaining to multiple employer plan.

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Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

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Amount of income tax expense (benefit) from continuing operations attributable to an adjustment of a deferred tax liability or asset for enacted changes in tax laws or rates or a change in the tax status of the entity.

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