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Short-Term Debt (Narrative) (Details) | Nov. 01, 2017 USD ($) | Aug. 01, 2017 USD ($) | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015
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Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt to EBITDA ratio (greater than) |  |  | 3.0 |  |  |  |  |  |  |  |  |  |  |
Ratio of net indebtedness to EBITDA, debt covenant |  |  | 3.80 | 4.02 | 4.05 | 4.12 | 4.21 | 4.08 | 4.40 | 4.80 | 4.40 | 4.56 | 4.61 | 4.62
Revolving Credit Facility [Member] | Bank Of America, N.A. [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of credit facility, maximum borrowing amount |  | $ 25,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Revolving Credit Facility [Member] | JPMorgan Chase Bank N.A. [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of credit facility, maximum borrowing amount | $ 25,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Revolving Credit Facility [Member] | LIBOR [Member] | Bank Of America, N.A. [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, basis spread on variable rate (as a percent) |  | 2.50% |  |  |  |  |  |  |  |  |  |  |  |
Revolving Credit Facility [Member] | LIBOR [Member] | JPMorgan Chase Bank N.A. [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, basis spread on variable rate (as a percent) | 2.25% |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit [Member] | Revolving Credit Facility [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ratio of net indebtedness to EBITDA, debt covenant |  |  | 0.75 |  |  |  |  |  |  |  |  |  |  |

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- Definition Debt Instrument, Covenant Terms, Ratio of Indebtedness to Earnings Before Interest, Taxes, Depreciation and Amortization + References No definition available. + Details
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- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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