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Financial Instrument Risk Financial Instruments Risk (Details) - USD ($) $ in Thousands | 1 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Dec. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Mar. 31, 2016 | Mar. 30, 2016 | Feb. 16, 2016
Interest Rate Derivatives [Abstract] |  |  |  |  |  |  |
Long-term debt | $ 437,629 | $ 438,312 | $ 437,629 |  |  |  |
Repayment of Term Loan |  | 410,400 | 754,071 | $ 0 |  |  |
Term Loans Due 2022 and 2026 [Member] |  |  |  |  |  |  |
Interest Rate Derivatives [Abstract] |  |  |  |  |  |  |
Long-term debt | 95,000 | 95,000 | 95,000 |  |  |  |
Debt Instrument, Face Amount |  | 125,000 |  |  |  |  |
Term Loan Due 2026 [Member] |  |  |  |  |  |  |
Interest Rate Derivatives [Abstract] |  |  |  |  |  |  |
Repayment of Term Loan | 30,000 |  | 30,000 |  |  |  |
Debt Instrument, Face Amount |  |  |  |  |  | $ 75,000 |
Interest Rate Swap [Member] | Not Designated as Hedging Instrument [Member] | Level 2 [Member] | Other Assets [Member] |  |  |  |  |  |  |
Interest Rate Derivatives [Abstract] |  |  |  |  |  |  |
Fair value of interest rate swap agreements, Asset | $ 4,200 | $ 4,700 | $ 4,200 |  |  |  |
Interest Rate Swap - $50 million notional amount fixed at 1.007% [Member] | Not Designated as Hedging Instrument [Member] |  |  |  |  |  |  |
Interest Rate Derivatives [Abstract] |  |  |  |  |  |  |
Interest rate swaps, notional amount |  |  |  |  |  |  | $ 50,000
Interest rate swaps, fixed interest rate |  |  |  |  |  |  | 1.007%
Interest Rate Swap - $75 million notional amount fixed at 1.256% [Member] | Not Designated as Hedging Instrument [Member] |  |  |  |  |  |  |
Interest Rate Derivatives [Abstract] |  |  |  |  |  |  |
Interest rate swaps, notional amount |  |  |  |  | $ 75,000 |  |
Interest rate swaps, fixed interest rate |  |  |  |  | 1.256% |  |

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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 Face (par) amount of debt instrument at time of issuance. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=64930739&loc=d3e28878-108400 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28551-108399 + Details
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- Definition Fixed interest rate related to the interest rate derivative. + References No definition available. + Details
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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 Fair value as of the balance sheet date of all derivative assets not designated as hedging instruments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4B -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5624163-113959 + Details
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- Definition Amount after unamortized (discount) premium and debt issuance costs of long-term debt classified as noncurrent and excluding amounts to be repaid within one year or the normal operating cycle, if longer. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations. + 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 210.5-02.22) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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