Debt and Commitments (Details Narrative) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended					12 Months Ended		0 Months Ended			12 Months Ended				1 Months Ended		12 Months Ended						12 Months Ended		12 Months Ended					0 Months Ended
	Dec. 31, 2013 USD ($)	Dec. 31, 2012 USD ($)	Dec. 31, 2011 USD ($)	Dec. 31, 2013 Bank Overdrafts [Member] USD ($)	Dec. 31, 2012 Bank Overdrafts [Member] USD ($)	Dec. 31, 2013 Line of Credit [Member] USD ($)	Dec. 31, 2012 Line of Credit [Member] USD ($)	Apr. 05, 2011 Convertible Debt [Member] 3.75% Convertible Notes [Member] USD ($)	Apr. 05, 2011 Convertible Debt [Member] 3.75% Convertible Notes [Member] Redeemed With Accrued Interest [Member] USD ($)	Apr. 05, 2011 Convertible Debt [Member] 3.75% Convertible Notes [Member] Surrendered For Conversion [Member] USD ($)	Dec. 31, 2013 Convertible Debt [Member] 3.375% Convertible Notes [Member] USD ($)	Dec. 31, 2012 Convertible Debt [Member] 3.375% Convertible Notes [Member] USD ($)	Dec. 31, 2009 Convertible Debt [Member] 3.375% Convertible Notes [Member] USD ($)	Dec. 31, 2007 Convertible Debt [Member] 3.375% Convertible Notes [Member] USD ($)	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, 2011 Revolving Credit Agreement [Member] USD ($)	Dec. 31, 2013 Revolving Credit Agreement [Member] EUR (€)	Jul. 10, 2012 Revolving Credit Agreement [Member] USD ($)	Sep. 26, 2011 Revolving Credit Agreement [Member] USD ($)	Dec. 31, 2013 Bank Overdrafts [Member]	Dec. 31, 2013 Euro Member Countries, Euro Revolving Credit Agreement [Member] USD ($)	Dec. 31, 2013 Minimum [Member]	Dec. 31, 2013 Minimum [Member] Revolving Credit Agreement [Member] USD ($)	Dec. 31, 2013 Maximum [Member]	Dec. 31, 2013 Maximum [Member] Revolving Credit Agreement [Member]	Dec. 31, 2013 Maximum [Member] Revolving Credit Agreement [Member] Adjusted for Certain Acquisitons [Member]	Sep. 27, 2013 London Interbank Offered Rate (LIBOR) [Member] Revolving Credit Agreement [Member]
Debt Instrument [Line Items]
Debt instrument, face amount														$ 100,000
Convertible notes stated interest rate								3.75%			3.375%
Convertible note repurchases, par value													44,364
Debt instrument, convertible, conversion ratio											35.3235
Debt instrument, convertible, conversion price											$ 28.31
Long-term debt, gross, net of unamortized discounts											54,905
Days Required for Closing Stock Price to be Greater or Equal to Threshold Percentage of Conversion Price											20 days
Total Measurement Days for Closing Stock Price to be Greater or Equal to Threshold Percentage of Conversion Price											30 days
Minimum ratio of stock price to conversion price for conversion											130.00%
Guaranteed cash payment upon conversion per note											1
Debt instrument, convertible, eligible for conversion											0	0
Convertible notes								92,500	11,865	80,635	55,636	55,636					487,920	589,200
Repayments of convertible debt, including premium on conversion								90,438
Premium paid on convertible debt redemption	0	0	9,803					9,803
Adjustments to additional paid in capital, premium paid on convertible debt redemption								6,085
Adjustments to additional paid in capital, income tax benefit from premium paid on convertible debt redemption, tax								3,718
Contingent convertible debt interest, amount recaptured for income tax purpose								40,217
Reduction in short-term deferred tax liabilities								15,252
Amortization period	3 months
Debt instrument, convertible, effective interest rate											8.00%
Line of credit facility maximum borrowing capacity						15,000											750,000		500,000	500,000		400,000
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
Line of Credit Facility With Accordian Feature, Maximum Borrowing Capacity																	1,000,000
Payments of debt issue costs																	1,261	1,030	2,012
Debt instrument basis spread on LIBOR																										1.10%		1.70%
Line of credit facility, amount outstanding																	487,920			114,000				157,320
Line of credit facility remaining borrowing capacity																	262,080
Line of credit facility, interest rate at period end						2.13%	2.16%										1.36%	1.97%
Debt covenant ratio of senior debt to EBITDA																												3.25	3.50
Debt covenant ratio of total debt to EBITDA																												4.00	4.25
Debt covenant ratio of EBITDA to cash interest expense																										4.25
Debt Covenant, Threshold Price of Acquisition Permitting Higher Ratio Limits																										150,000
Notes and overdrafts payable	1,074	3,795		74	580	1,000	2,800
Repayment period						7 days																	2 days
Maturity of Bank Acceptances																									3 months		6 months
Letters of credit outstanding, amount	$ 6,799