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Significant Accounting Policies (Detail Textuals 1) (USD $) | 12 Months Ended
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Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2013 Defined Benefit Pension Plan | Dec. 31, 2013 Operating equipment Minimum | Dec. 31, 2013 Operating equipment Maximum | Dec. 31, 2013 Buildings and leasehold improvements Minimum | Dec. 31, 2013 Buildings and leasehold improvements Maximum | Dec. 31, 2013 Furniture and fixtures Minimum | Dec. 31, 2013 Furniture and fixtures Maximum | Dec. 31, 2013 Software | Dec. 31, 2013 Vehicles Minimum | Dec. 31, 2013 Vehicles Maximum | Dec. 31, 2008 Interest Rate Swap
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount of interest rate swap agreement |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 50,000,000
Estimated useful lives of the assets |  |  |  |  | 3 years | 20 years | 15 years | 39 years | 5 years | 7 years | 5 years | 3 years | 5 years |
Depreciation method used for property, plant and equipment | straight-line basis |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill | 31,861,000 | 24,093,000 |  |  |  |  |  |  |  |  |  |  |  |
Acquisition of assets of a business | 17,044,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill on acquisition | 7,768,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Advertising expenses | $ 3,458,000 | $ 2,965,000 | $ 2,406,000 |  |  |  |  |  |  |  |  |  |  |
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. |  |  |  |  |  |  |  |  |  |

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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 of a favorable spread to a debt holder between the amount of debt being converted and the value of the securities received upon conversion. This is an embedded conversion feature of convertible debt issued that is in-the-money at the commitment date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Beneficial Conversion Feature -URI http://asc.fasb.org/extlink&oid=6505963 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21538-112644 + 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=28361610&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 60 -Glossary Defined Benefit Postretirement Plan -URI http://asc.fasb.org/extlink&oid=6749240 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 30 -Glossary Defined Benefit Pension Plan -URI http://asc.fasb.org/extlink&oid=6510300 + 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 -URI http://asc.fasb.org/extlink&oid=14024403&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 + Details
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- Definition Amount of increase in asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized resulting from a business combination. + 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=14024403&loc=d3e13816-109267 + Details
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- Definition The cash outflow associated with the acquisition of a business, net of the cash acquired from the purchase. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3213-108585 + 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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