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Credit Arrangements - Narrative (Details) $ in Thousands, $ in Millions |  |  | 3 Months Ended | 9 Months Ended | 12 Months Ended | 34 Months Ended |  |  |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Aug. 03, 2018 USD ($) | Jun. 03, 2015 USD ($) | Sep. 30, 2018 USD ($) | Sep. 30, 2018 USD ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) building | Nov. 09, 2015 USD ($) item | Dec. 31, 2018 CAD ($) loan | Dec. 31, 2018 USD ($) loan | Sep. 30, 2017 USD ($) | Sep. 29, 2017 USD ($) | Sep. 28, 2017 USD ($) | Dec. 31, 2016 USD ($) | Dec. 31, 2015 loan | Jul. 25, 2013 USD ($) | Dec. 28, 2012 USD ($)
Credit arrangements |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted average interest rate (as a percent) |  |  |  |  |  | 3.00% |  | 4.10% | 4.10% |  |  |  |  |  |  |
Mortgages |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Credit arrangements |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate (as a percent) |  |  |  |  |  | 5.00% |  | 4.50% | 4.50% |  |  |  |  |  |  |
Principal amount |  |  |  |  |  |  |  |  | $ 16,500 |  |  |  |  |  |  |
Number Of Mortgages | loan |  |  |  |  |  |  |  | 2 | 2 |  |  |  |  |  |  |
Number of assets secured | building |  |  |  |  |  | 3 |  |  |  |  |  |  |  |  |  |
Assumed notes |  |  |  |  |  | $ 4,200 |  |  |  |  |  |  |  |  |  |
Secured mortgage notes, maturing on January 1, 2031 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Credit arrangements |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate (as a percent) |  |  |  |  |  |  |  |  |  |  |  |  |  | 4.30% |  |
Principal amount |  |  |  |  |  |  |  |  |  |  |  |  | $ 8,000 |  |  |
Number Of Mortgages | loan |  |  |  |  |  |  |  |  |  |  |  |  |  | 2 |  |
Senior secured notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Credit arrangements |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate (as a percent) |  |  |  |  |  |  | 4.60% |  |  |  |  |  |  |  | 3.85% | 3.65%
Principal amount |  |  |  |  |  |  | $ 25,000 |  |  |  |  |  |  |  | $ 25,000 | $ 50,000
Number of tranches | item |  |  |  |  |  |  | 3 |  |  |  |  |  |  |  |  |
Prepayment penalty |  |  | $ 2,300 |  |  |  |  |  |  |  |  |  |  |  |  |
Notes Agreement |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Credit arrangements |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 25,000
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 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal amount |  | $ 75,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commercial Equipment Notes | Minimum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Credit arrangements |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate (as a percent) |  |  |  |  |  |  |  | 1.83% | 1.83% |  |  |  |  |  |  |
Commercial Equipment Notes | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Credit arrangements |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate (as a percent) |  |  |  |  |  |  |  | 4.40% | 4.40% |  |  |  |  |  |  |
Credit Agreement |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Credit arrangements |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  |  |  |  |  |  |  |  | $ 200,000 | $ 125,000 |  |  |  |
Potential increase per the accordion feature | $ 75,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt issuance costs |  |  | $ 1,000 | $ 1,000 |  |  |  |  |  | $ 600 |  |  |  |  |  |
Additional Period to Issue Notes |  | 3 years |  |  |  |  |  |  |  |  |  |  |  |  |  |
Available borrowing capacity |  |  |  |  |  |  |  |  | $ 147,000 |  |  |  |  |  |  |
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 | Credit Agreement |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Credit arrangements |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  |  |  |  |  |  | 200,000 |  |  |  |  |  |  |
Maximum borrowing capacity with accordion feature |  |  |  |  |  |  |  |  | 250,000 |  |  |  |  |  |  |
Credit Agreement | Commercial letters of credit |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Credit arrangements |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commercial letters of credit outstanding |  |  |  |  |  |  |  |  | 53,000 |  |  |  |  |  |  |
Term Loan |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Credit arrangements |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal amount | 220,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate swap agreement |  |  |  | 75.00% |  |  |  |  |  |  |  |  |  |  |  |
Derivative fixed interest rate (as a percent) |  |  | 2.886% | 2.886% |  |  |  |  |  |  |  |  |  |  |  |
Term Loan | LIBOR |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Credit arrangements |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate (as a percent) |  |  |  |  | 2.00% |  |  |  |  |  |  |  |  |  |  |
Term Loan | First Three Years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Credit arrangements |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Quarterly principal payment | 2,750 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Annual principal payments | $ 11,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of years payments are to be made | 3 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Term Loan | Next Two Years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Credit arrangements |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Quarterly principal payment | $ 4,125 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Annual principal payments | $ 16,500 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Canadian Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Credit arrangements |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Available borrowing capacity |  |  |  |  |  |  |  | $ 4.0 |  |  |  |  |  |  |  |
Canadian Credit Facility | Commercial letters of credit |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Credit arrangements |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  |  |  |  |  | $ 8.0 | $ 4,000 |  |  |  |  |  |  |
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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