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Financial Instruments And Concentration Of Credit Risk (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Concentration Risk [Line Items] |  |  |
Concentration Risk Customer Accounts Receivable | One of the most significant credit risks is the ultimate realization of accounts receivable. This risk is mitigated by (i) sales to well established companies, (ii) ongoing credit evaluation of customers, and (iii) frequent contact with customers, thus enabling management to monitor current changes in business operations and to respond accordingly. Management considers these concentrations of credit risks in establishing our allowance for doubtful accounts and believes these allowances are adequate. The Company had two customers whose gross accounts receivable exceeded 10% of total gross accounts receivable as of December 31, 2017. One customer represented 19% of our total gross accounts receivable and the second customer represented 11%. |  |
Fair Value Off Balance Sheet Risks Disclosure Information [Line Items] |  |  |
Unrealized gain on derivative, net of tax | $ 1,192 | $ 286 | $ 0
Interest Rate Swap [Member] |  |  |
Fair Value Off Balance Sheet Risks Disclosure Information [Line Items] |  |  |
Interest rate swap notional amount | $ 155,300 | 163,900 |
Fixed interest rate | 1.4935% |  |
Fair value of interest rate swap | $ 2,000 | 500 |
Unrealized gain on interest rate swap | 1,500 | 500 |
Unrealized gain on derivative, net of tax | $ 900 | $ 300 |
Accounts Receivable [Member] | Largest Customer Accounts Receivable [Member] |  |  |
Concentration Risk [Line Items] |  |  |
Concentration risk, percentage | 19.00% |  |
Accounts Receivable [Member] | Second Largest Customer Accounts Receivable [Member] |  |  |
Concentration Risk [Line Items] |  |  |
Concentration risk, percentage | 11.00% |  |

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- Definition Aggregate notional amount specified by the derivative(s). Expressed as an absolute value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 12 -Section 13 -Sentence Column B + Details
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- Definition Description of risks that arise due to the volume of business transacted with a particular customer. At a minimum, the description informs financial statement users of the general nature of the risk, but excludes "Information about Major Customers" that may be disclosed elsewhere (for instance, segment disclosures). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 18 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=84177426&loc=d3e6351-108592 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=84177426&loc=d3e6404-108592 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 16 -URI http://asc.fasb.org/extlink&oid=84177426&loc=d3e6327-108592 + Details
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