Debt (Details) € in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)	Dec. 31, 2018 EUR (€)	Dec. 31, 2018 USD ($)	Dec. 31, 2018 AUD ($)	Sep. 29, 2017 USD ($)	Sep. 28, 2017 USD ($)
Debt Instrument [Line Items]
Loss on Cash Flow Hedge Ineffectiveness			$ 100
Current portion [Abstract]
Short-term borrowings		$ 1,937			$ 0
Short-term borrowings and current portion of long-term debt		10,835			9,168
Long-term portion [Abstract]
Long-term debt, net		508,815			657,593
Total debt		519,650			666,761
Debt
Standby Letters of Credit					$ 4,800
Gain on Cash Flow Hedge Ineffectiveness	$ 1,200	2,435
Average total leverage ratio, dividend declarations				300.00%	300.00%	300.00%
Maximum average total leverage ratio, share repurchases				250.00%	250.00%	250.00%
Financial and other covenants [Abstract]
Financial covenants, dividend limitation as percent of preceding year's net income, maximum (in hundredths)	50.00%
Deferred financing costs [Abstract]
Balance at beginning of year	$ 4,606	4,883
Financing costs deferred	106	1,104	69
Write-off of fully amortized deferred financing costs	0	(1,381)
Balance at end of year	$ 4,712	4,606	$ 4,883
Less: Accumulated amortization		(2,982)			$ (3,674)
Deferred financing costs, net of accumulated amortization		1,624			1,038
London Interbank Offered Rate (LIBOR) [Member]
Debt
Debt Instrument, Basis Spread on Variable Rate	1.00%
Debt Instrument, Interest Rate Margins on Variable Rates, Minimum	1.025%
Debt Instrument, Interest Rate Margins on Variable Rate, Maximum	1.425%
Base Rate [Member]
Debt
Debt Instrument, Interest Rate Margins on Variable Rates, Minimum	0.025%
Debt Instrument, Interest Rate Margins on Variable Rate, Maximum	0.425%
Canadian Dealer Offered Rate [Member]
Debt
Debt Instrument, Basis Spread on Variable Rate	1.00%
Debt Instrument, Interest Rate Margins on Variable Rates, Minimum	1.15%
Debt Instrument, Interest Rate Margins on Variable Rate, Maximum	1.65%
Federal Funds Rate [Member]
Debt
Debt Instrument, Basis Spread on Variable Rate	0.50%
Commercial Paper [Member]
Debt
Debt Instrument, Basis Spread on Variable Rate	0.75%
Unsecured Syndicated Senior Credit Facility [Member]
Long-term portion [Abstract]
Long-term Line of Credit, Noncurrent		410,439			550,131
Debt
Line of credit facility facility, maximum borrowing capacity							$ 750,000	$ 465,000
Line of credit facility, term (in years)	5 years
Line of Credit, Accordian Feature Increase in borrowing capacity					75,000
Line of Credit Facility, Maximum Capacity Including Accordian					825,000
Line of Credit Facility, Amount Outstanding					550,132
Line of credit facility, remaining borrowing capacity					$ 195,068
Weighted average effective interest rate (in hundredths)				3.50%	3.50%	3.50%
Annual facility fee, minimum (in hundredths)	0.10%
Annual facility fee, maximum (in hundredths)	0.20%
Receivables Securitization Facility [Member]
Long-term portion [Abstract]
Receivable Securitization Facility		100,000			$ 108,500
Debt
Receivables Facility, Borrowing Capacity Peak Seasonal Maximum					295,000
Receivables Facility, Borrowing Capacity NonSeasonal Minimum					95,000
Receivables Facility, Borrowing Capacity NonSeasonal Maximum					280,000
Receivables Facility, Term (in years)	2 years
Receivable Securitization Facility		100,000			$ 108,500
Weighted average effective interest rate				3.30%	3.30%	3.30%
Receivables facility, unused fee	0.35%
Australian Seasonal Credit Facility [Member]
Current portion [Abstract]
Australian credit facility		$ 8,898			$ 9,168
Debt
Line of credit facility facility, maximum borrowing capacity						$ 20,000,000
Bank Overdrafts [Member]
Debt
Borrowing Capacity, Bank Overdraft Facility (in Euros) | €				€ 12,000