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v3.19.1

Long-Term Debt (Narrative) (Details) - USD ($) |  |  |  | 12 Months Ended
--- | --- | --- | --- | ---
Feb. 26, 2018 | Dec. 30, 2015 | Jul. 06, 2010 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Debt Instrument [Line Items] |  |  |  |  |  |
Exchangeable Unsecured Notes, due 2102 |  |  |  | $ 0 | $ 2,794,000 |
Interest paid |  |  |  | $ 1,600,000 | $ 1,700,000 | $ 1,300,000
Other Debt |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt instrument term (in years) |  |  |  | 3 years |  |
Stated interest rate (as a percent) |  |  |  | 0.00% |  |
2015 Credit Agreement - Revolving Facility |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Principle amount |  | $ 30,000,000.0 |  |  |  |
Letter Of Credit |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Principle amount |  | 10,000,000.0 |  |  |  |
2015 Credit Agreement - U.S. Closing Date Term Facility |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Principle amount |  | 4,500,000.0 |  |  |  |
2015 Credit Agreement - U.S. Delayed Draw Term Facility |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Principle amount |  | 11,000,000.0 |  |  |  |
Foreign Term Facility |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Principle amount |  | 9,500,000.0 |  |  |  |
Domestic Revolving Facility |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Principle amount |  | $ 15,000,000.0 |  |  |  |
2015 Credit Agreement |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Expiration date |  | Dec. 30, 2020 |  |  |  |
2015 Credit Agreement | London Interbank Offered Rate (LIBOR) |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
LIBOR |  | LIBOR |  |  |  |
Interest rate in addition to LIBOR |  | 0.25% |  |  |  |
2015 Credit Agreement | London Interbank Offered Rate (LIBOR) | Minimum |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Interest rate in addition to LIBOR |  | 2.00% |  |  |  |
Quarterly commitment fee |  | 0.30% |  |  |  |
2015 Credit Agreement | London Interbank Offered Rate (LIBOR) | Maximum |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Interest rate in addition to LIBOR |  | 3.50% |  |  |  |
Quarterly commitment fee |  | 0.50% |  |  |  |
2015 Credit Agreement | Revolving and U.S. Delayed Draw Term Facilities | London Interbank Offered Rate (LIBOR) |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt Instrument, interest rate |  |  |  | 4.82% | 4.19% |
2015 Credit Agreement | U.S. Closing Date Term and Canadian Term Facilities |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt Instrument, interest rate |  |  |  | 4.82% | 4.19% |
Other Lines of Credit | Line of Credit |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Principle amount |  |  |  | $ 3,000,000 | $ 3,000,000 |
Letters of credit outstanding |  |  |  | $ 900,000 | $ 1,200,000 |
Exchangeable Unsecured Notes due 2102 | Unsecured Debt |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Exchangeable Unsecured Notes, due 2102 |  |  | $ 10,000,000.0 |  |  |
Maturity date |  |  | Dec. 13, 2102 |  |  |
Principal amount of notes exchanged for common stock | $ 2,800,000 |  |  |  |  |
Conversion of exchangeable notes to common stock (in shares) | 123,808 |  |  |  |  |
Exchangeable notes conversion price amount (in dollars per share) | $ 22.57 |  |  |  |  |

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