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Significant Accounting Policies (Detail Textuals 1) - USD ($) | 12 Months Ended
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Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Significant Accounting Policies [Line Items] |  |  |
Depreciation method used for property, plant and equipment | straight-line basis |  |
Goodwill | $ 32,150,000 | $ 32,150,000 |
Advertising expenses | 1,296,000 | $ 2,058,000 | $ 3,959,000
Accounting change resulted in a beneficial adjustment in 2017 | $ 2,500,000 |  |
Defined Benefit Pension Plan |  |  |
Significant Accounting Policies [Line Items] |  |  |
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 |  |
Operating equipment | Minimum |  |  |
Significant Accounting Policies [Line Items] |  |  |
Estimated useful lives of the assets | 3 years |  |
Operating equipment | Maximum |  |  |
Significant Accounting Policies [Line Items] |  |  |
Estimated useful lives of the assets | 20 years |  |
Buildings and leasehold improvements | Minimum |  |  |
Significant Accounting Policies [Line Items] |  |  |
Estimated useful lives of the assets | 15 years |  |
Buildings and leasehold improvements | Maximum |  |  |
Significant Accounting Policies [Line Items] |  |  |
Estimated useful lives of the assets | 39 years |  |
Furniture and fixtures | Minimum |  |  |
Significant Accounting Policies [Line Items] |  |  |
Estimated useful lives of the assets | 5 years |  |
Furniture and fixtures | Maximum |  |  |
Significant Accounting Policies [Line Items] |  |  |
Estimated useful lives of the assets | 7 years |  |
Software |  |  |
Significant Accounting Policies [Line Items] |  |  |
Estimated useful lives of the assets | 5 years |  |
Vehicles | Minimum |  |  |
Significant Accounting Policies [Line Items] |  |  |
Estimated useful lives of the assets | 3 years |  |
Vehicles | Maximum |  |  |
Significant Accounting Policies [Line Items] |  |  |
Estimated useful lives of the assets | 5 years |  |

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 720 -SubTopic 35 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6420018&loc=d3e36677-107848 + Details
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- Definition Amount after tax of increase (decrease) to equity or (increase) decrease to net assets, resulting from the cumulative effect adjustment of a new accounting principle applied in the period of adoption. + References No definition available. + Details
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- Definition General information regarding defined benefit plans. A defined benefit pension plan is a plan that defines an amount of pension benefit to be provided, usually as a function of one or more factors such as age, years of service, or compensation. An other postretirement defined benefit plan is an arrangement that is mutually understood by an employer and its employees, whereby an employer undertakes to provide its employees with benefits other than pensions, after they retire in exchange for their services over a specified period of time, upon attaining a specified age while in service, or a combination of both. Any plan that is not a defined contribution plan is a defined benefit plan. General descriptive information about the employer's defined benefit plans, including employee groups covered, type of benefit formula, type of benefits, cost sharing arrangements, funding policy, types of assets held, and significant nonbenefit liabilities, if any. Also includes information pertaining to multiple employer plans, which are accounted for as single-employer plans. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Defined Benefit Plan -URI http://asc.fasb.org/extlink&oid=49172387 + Details
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- Definition Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13770-109266 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=64834752&loc=SL49117168-202975 + Details
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- Definition Description of the methodology for computing depreciation for classes of depreciable assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 + Details
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- Definition Describes the periods of time over which an entity anticipates to receive utility from its property, plant and equipment (that is, the periods of time over which an entity allocates the initial cost of its property, plant and equipment). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=68058157&loc=d3e18780-107790 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 35 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=68071081&loc=d3e1205-110223 + Details
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