Debt and Commitments (Details Narrative) In Thousands, unless otherwise specified	12 Months Ended					12 Months Ended		0 Months Ended						1 Months Ended		12 Months Ended							12 Months Ended										12 Months Ended		12 Months Ended				0 Months Ended
	Dec. 31, 2014 USD ($)	Dec. 31, 2013 USD ($)	Dec. 31, 2012 USD ($)	Dec. 31, 2014 Bank Overdrafts [Member] USD ($)	Dec. 31, 2013 Bank Overdrafts [Member] USD ($)	Dec. 31, 2014 Line of Credit [Member] USD ($)	Dec. 31, 2013 Line of Credit [Member] USD ($)	Jun. 24, 2014 Convertible Debt [Member] 3.375% Convertible Notes [Member] USD ($)	Dec. 31, 2014 Convertible Debt [Member] 3.375% Convertible Notes [Member] USD ($)	Jun. 30, 2014 Convertible Debt [Member] 3.375% Convertible Notes [Member]	Jun. 24, 2014 Convertible Debt [Member] 3.375% Convertible Notes [Member] USD ($)	Jun. 16, 2014 Convertible Debt [Member] 3.375% Convertible Notes [Member] USD ($)	Dec. 31, 2013 Convertible Debt [Member] 3.375% Convertible Notes [Member] USD ($)	Sep. 30, 2013 Revolving Credit Agreement [Member]	Sep. 30, 2011 Revolving Credit Agreement [Member]	Dec. 31, 2013 Revolving Credit Agreement [Member] USD ($)	Dec. 31, 2012 Revolving Credit Agreement [Member] USD ($)	Dec. 31, 2014 Revolving Credit Agreement [Member] USD ($)	Dec. 31, 2014 Revolving Credit Agreement [Member] EUR (€)	Jul. 10, 2012 Revolving Credit Agreement [Member] USD ($)	Dec. 31, 2011 Revolving Credit Agreement [Member] USD ($)	Sep. 26, 2011 Revolving Credit Agreement [Member] USD ($)	Dec. 31, 2014 Bank Overdrafts [Member]	Dec. 31, 2014 Senior Notes [Member] 3.97% Senior Notes [Member] USD ($)	Oct. 15, 2014 Senior Notes [Member] 3.97% Senior Notes [Member] USD ($)	Dec. 31, 2013 Senior Notes [Member] 3.97% Senior Notes [Member] USD ($)	Dec. 31, 2014 Foreign bank borrowings [Member] USD ($)	Dec. 31, 2013 Foreign bank borrowings [Member] USD ($)	Dec. 31, 2014 Euro Member Countries, Euro Revolving Credit Agreement [Member] USD ($)	Dec. 31, 2014 Euro Member Countries, Euro Revolving Credit Agreement [Member] EUR (€)	Dec. 31, 2013 Euro Member Countries, Euro Revolving Credit Agreement [Member] USD ($)	Dec. 31, 2013 Euro Member Countries, Euro Revolving Credit Agreement [Member] EUR (€)	Dec. 31, 2014 Minimum Revolving Credit Agreement [Member] USD ($)	Oct. 15, 2014 Minimum Senior Notes [Member]	Dec. 31, 2014 Maximum Revolving Credit Agreement [Member]	Dec. 31, 2014 Maximum Revolving Credit Agreement [Member] Adjusted for Certain Acquisitons [Member]	Oct. 15, 2014 Maximum Senior Notes [Member]	Oct. 15, 2014 Maximum Senior Notes [Member] Adjusted for Certain Acquisitons [Member]	Sep. 27, 2013 London Interbank Offered Rate (LIBOR) [Member] Revolving Credit Agreement [Member]
Debt Instrument [Line Items]
Debt Conversion, Converted Instrument, Amount Redeemed with Accrued Interest								$ 7
Debt Conversion, Converted Instrument, Amount								55,405
Debt instrument, face amount																									100,000
Convertible notes stated interest rate										3.375%		3.375%													3.97%
Debt Instrument, Prepayment Percentage of Principal Amount																									100.00%
Convertible notes									0				55,636			487,920		393,518						100,000		0	0	405
Repayments of convertible debt, including premium on conversion								70,497
Premium paid on convertible debt redemption	14,868	0	0					14,868
Adjustments to additional paid in capital, premium paid on convertible debt redemption								9,326
Adjustments to additional paid in capital, income tax benefit from premium paid on convertible debt redemption, tax								5,542
Contingent convertible debt interest, amount recaptured for income tax purpose								23,565
Reduction in short-term deferred tax liabilities								8,784
Debt instrument, convertible, effective interest rate									8.00%
Line of credit facility maximum borrowing capacity						56,000												750,000	500,000		500,000	400,000
Line of Credit Facility With Accordian Feature, Maximum Borrowing Capacity																		1,000,000
Debt Instrument, Description of Variable Rate Basis																																							LIBOR
Line of credit expiration date extension														2 years	4 years
Line of Credit Facility, Accordian Feature Amount																				250,000
Payments of debt issue costs																1,261	1,030
Debt instrument basis spread on LIBOR																																	1.10%		1.70%
Line of credit facility, amount outstanding																487,920		393,518											37,618	30,945	157,320	114,000
Line of credit facility remaining borrowing capacity																262,080		356,482
Line of credit facility, interest rate at period end						1.23%	2.13%									1.36%		1.33%	1.33%
Debt covenant ratio of senior debt to EBITDA																																			3.25	3.50	3.25	3.50
Debt covenant ratio of total debt to EBITDA																																			4.00	4.25	4.00	4.25
Debt covenant ratio of EBITDA to cash interest expense																																	4.25	4.25
Debt Covenant, Threshold Price of Acquisition Permitting Higher Ratio Limits																																	150,000
Notes and overdrafts payable	8,028	1,074		478	74	7,550	1,000
Repayment period						7 days																	2 days
Letters of credit outstanding, amount	5,952
Convertible Note Repurchases, Par Value												224
Convertible Debt											$ 55,412