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Credit Arrangements - Background (Details) $ in Thousands, CAD in Millions |  |  |  | 12 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Nov. 09, 2015 USD ($) payment | Jun. 03, 2015 USD ($) | Jul. 25, 2013 USD ($) payment | Dec. 31, 2017 USD ($) building | Dec. 31, 2015 USD ($) loan building | Dec. 31, 2017 CAD | Dec. 31, 2017 USD ($) | Sep. 30, 2017 USD ($) | Sep. 29, 2017 USD ($) | Sep. 28, 2017 USD ($) | Dec. 28, 2012 USD ($)
Senior Notes |  |  |  |  |  |  |  |  |  |  |
Credit arrangements |  |  |  |  |  |  |  |  |  |  |
Initial principal amount | $ 25,000 |  |  |  |  |  |  |  |  |  | $ 50,000
Interest rate (as a percent) | 4.60% |  |  |  |  | 3.65% | 3.65% |  |  |  |
Required principal payment | $ 3,600 |  |  | $ 7,100 |  |  |  |  |  |  |
Number of annual principal payments | payment | 7 |  |  |  |  |  |  |  |  |  |
Senior Notes | Minimum |  |  |  |  |  |  |  |  |  |  |
Credit arrangements |  |  |  |  |  |  |  |  |  |  |
Prepayment to be paid on debt |  |  |  | $ 5,000 |  |  |  |  |  |  |
Notes Agreement |  |  |  |  |  |  |  |  |  |  |
Credit arrangements |  |  |  |  |  |  |  |  |  |  |
Initial principal amount |  |  | $ 25,000 |  |  |  |  |  |  |  | $ 25,000
Interest rate (as a percent) |  |  | 3.85% |  |  |  |  |  |  |  |
Required principal payment |  |  | $ 3,600 |  |  |  |  |  |  |  |
Number of annual principal payments | payment |  |  | 7 |  |  |  |  |  |  |  |
Notes Agreement | Minimum |  |  |  |  |  |  |  |  |  |  |
Credit arrangements |  |  |  |  |  |  |  |  |  |  |
Restrictions on investments, change of control provisions and provisions as a percentage of total assets to be disposed off |  |  |  | 20.00% |  |  |  |  |  |  |
Notes Agreement | Maximum |  |  |  |  |  |  |  |  |  |  |
Credit arrangements |  |  |  |  |  |  |  |  |  |  |
Initial principal amount |  | $ 75,000 |  |  |  |  |  |  |  |  |
Mortgages |  |  |  |  |  |  |  |  |  |  |
Credit arrangements |  |  |  |  |  |  |  |  |  |  |
Number of assets secured | building |  |  |  | 3 |  |  |  |  |  |  |
Interest rate (as a percent) |  |  |  |  |  | 5.00% | 5.00% |  |  |  |
Assumed notes |  |  |  |  |  |  | $ 4,200 |  |  |  |
Commercial equipment notes | Minimum |  |  |  |  |  |  |  |  |  |  |
Credit arrangements |  |  |  |  |  |  |  |  |  |  |
Interest rate (as a percent) |  |  |  |  |  | 1.78% | 1.78% |  |  |  |
Commercial equipment notes | Maximum |  |  |  |  |  |  |  |  |  |  |
Credit arrangements |  |  |  |  |  |  |  |  |  |  |
Interest rate (as a percent) |  |  |  |  |  | 3.51% | 3.51% |  |  |  |
Secured mortgage notes, maturing on January 1, 2031 |  |  |  |  |  |  |  |  |  |  |
Credit arrangements |  |  |  |  |  |  |  |  |  |  |
Number of secured mortgage notes payable to a bank | loan |  |  |  |  | 2 |  |  |  |  |  |
Initial principal amount |  |  |  |  | $ 8,000 |  |  |  |  |  |
Number of assets secured | building |  |  |  |  | 2 |  |  |  |  |  |
Interest rate (as a percent) |  |  |  |  | 4.30% |  |  |  |  |  |
Credit Agreement |  |  |  |  |  |  |  |  |  |  |
Credit arrangements |  |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  |  |  |  |  |  | $ 200,000 | $ 125,000 |
Debt issuance costs |  |  |  |  |  |  |  | $ 600 |  |  |
Available borrowing capacity |  |  |  |  |  |  | $ 180,500 |  |  |  |
Additional period of time to issue notes |  | 3 years |  |  |  |  |  |  |  |  |
Credit Agreement | Federal funds rate |  |  |  |  |  |  |  |  |  |  |
Credit arrangements |  |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate (as a percent) |  |  |  | 0.50% |  |  |  |  |  |  |
Credit Agreement | Minimum |  |  |  |  |  |  |  |  |  |  |
Credit arrangements |  |  |  |  |  |  |  |  |  |  |
Prepayment to be paid on debt |  |  |  | $ 5,000 |  |  |  |  |  |  |
Restrictions on investments, change of control provisions and provisions as a percentage of total assets to be disposed off |  |  |  | 20.00% |  |  |  |  |  |  |
Credit Agreement | Revolving credit facility |  |  |  |  |  |  |  |  |  |  |
Credit arrangements |  |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  |  |  |  | 200,000 |  |  |  |
Borrowings outstanding |  |  |  |  |  |  | 0 |  |  |  |
Credit Agreement | Commercial letters of credit |  |  |  |  |  |  |  |  |  |  |
Credit arrangements |  |  |  |  |  |  |  |  |  |  |
Total commercial letters of credit outstanding |  |  |  |  |  |  | 19,500 |  |  |  |
Canadian Credit Facility |  |  |  |  |  |  |  |  |  |  |
Credit arrangements |  |  |  |  |  |  |  |  |  |  |
Available borrowing capacity | CAD |  |  |  |  |  | CAD 7.5 |  |  |  |  |
Canadian Credit Facility | Commercial letters of credit |  |  |  |  |  |  |  |  |  |  |
Credit arrangements |  |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity | CAD |  |  |  |  |  | CAD 8.0 |  |  |  |  |
Total commercial letters of credit outstanding |  |  |  |  |  |  | $ 500 |  |  |  |
Annual fee (as a percent) |  |  |  | 1.00% |  |  |  |  |  |  |
Canadian Credit Facility | Commercial letters of credit | Maximum |  |  |  |  |  |  |  |  |  |  |
Credit arrangements |  |  |  |  |  |  |  |  |  |  |
Term of credit facility |  |  |  | 5 years |  |  |  |  |  |  |

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- Definition Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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- Definition Amount, before accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28555-108399 + Details
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- Definition The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement. + 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 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(16)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + 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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- Definition Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding). + 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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