Debt and Commitments (Details Narrative)	1 Months Ended	12 Months Ended
	Feb. 28, 2017 USD ($)	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)	Oct. 15, 2014 USD ($)
Debt Instrument [Line Items]
Notes and overdrafts payable		$ 5,669,000	$ 30,825,000
Letters of credit outstanding, amount		9,339,000
Long-term Debt, Maturities, Repayments of Principal in 2018		6,999,000
Long-term Debt, Maturities, Repayments of Principal in 2019		955,000
Long-term Debt, Maturities, Repayments of Principal in 2020		508,000
Long-term Debt, Maturities, Repayments of Principal in 2021		601,000
Long-term Debt, Maturities, Repayments of Principal in 2022		421,989,000
Long-term Debt, Maturities, Repayments of Principal, thereafter		101,544,000
Interest paid		13,962,000	11,471,000	$ 10,550,000
Interest capitalized		415,000	324,000	$ 422,000
Bank Overdrafts [Member]
Debt Instrument [Line Items]
Notes and overdrafts payable		369,000	$ 125,000
Line of Credit [Member]
Debt Instrument [Line Items]
Maximum borrowing capacity		$ 59,000,000
Line of credit facility, interest rate at period end		2.33%	1.96%
Notes and overdrafts payable		$ 5,300,000	$ 30,700,000
Repayment period		1 month
Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Maximum borrowing capacity			750,000,000
Accordion feature amount			250,000,000
Revolving Credit Agreement [Member]
Debt Instrument [Line Items]
Carrying amount of debt		$ 421,500,000	363,300,000
Line of credit facility, amount outstanding		421,500,000	363,300,000
Line of credit facility remaining borrowing capacity		$ 428,500,000	$ 386,700,000
Line of credit facility, interest rate at period end		2.65%	1.86%
Revolving Credit Agreement [Member] | Subsidiaries [Member]
Debt Instrument [Line Items]
Line of credit facility, amount outstanding			$ 100,000,000
Bank Overdrafts [Member]
Debt Instrument [Line Items]
Repayment period		2 days
Senior Notes [Member] | 3.97% Senior Notes [Member]
Debt Instrument [Line Items]
Debt instrument, face amount					$ 100,000,000
Convertible notes stated interest rate					3.97%
Carrying amount of debt		$ 100,000,000	100,000,000
Prepayment percentage of principal					100.00%
Foreign bank borrowings [Member]
Debt Instrument [Line Items]
Carrying amount of debt		$ 886,000	$ 1,416,000
Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Debt Instrument, Covenant, Consolidated Senior Credit to Consolidated EBITDA (not more than)		3.25
Debt Instrument, Covenant, Total Consolidated Debt to Consolidated EBITDA (not more than)		3.75
Debt Instrument, Covenant, Consolidated EBITDA to Consolidated Cash Interest Expense (not less than)		4.25
Revolving Credit Facility [Member] | Fourth Amendment, Maturity February 2022 [Member]
Debt Instrument [Line Items]
Maximum borrowing capacity	$ 850,000,000
Fees and expenses paid with amendment	2,542,000
Revolving Credit Facility [Member] | Fourth Amendment, Maturity February 2022, Accordion Feature [Member]
Debt Instrument [Line Items]
Maximum borrowing capacity	350,000,000
Revolving Credit Facility [Member] | Euro [Member] | Fourth Amendment, Maturity February 2022 [Member]
Debt Instrument [Line Items]
Maximum borrowing capacity	600,000,000
Revolving Credit Facility [Member] | Sterling [Member] | Fourth Amendment, Maturity February 2022 [Member]
Debt Instrument [Line Items]
Maximum borrowing capacity	600,000,000
Revolving Credit Facility [Member] | Swiss Franc [Member] | Fourth Amendment, Maturity February 2022 [Member]
Debt Instrument [Line Items]
Maximum borrowing capacity	$ 600,000,000
Revolving Credit Facility [Member] | London Interbank Offered Rate (LIBOR) [Member] | Minimum [Member] | Fourth Amendment, Maturity February 2022 [Member]
Debt Instrument [Line Items]
Basis spread on variable rate	1.10%
Revolving Credit Facility [Member] | London Interbank Offered Rate (LIBOR) [Member] | Maximum [Member] | Fourth Amendment, Maturity February 2022 [Member]
Debt Instrument [Line Items]
Basis spread on variable rate	1.70%
Revolving Credit Facility [Member] | Base Rate [Member] | Minimum [Member] | Fourth Amendment, Maturity February 2022 [Member]
Debt Instrument [Line Items]
Basis spread on variable rate	0.10%
Revolving Credit Facility [Member] | Base Rate [Member] | Maximum [Member] | Fourth Amendment, Maturity February 2022 [Member]
Debt Instrument [Line Items]
Basis spread on variable rate	0.70%