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Long-Term Debt (Narrative) (Details) - USD ($)				12 Months Ended
Long-Term Debt (Narrative) (Details) - USD ($)	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