Debt (Details) In Thousands, unless otherwise specified			3 Months Ended				0 Months Ended			0 Months Ended					0 Months Ended						3 Months Ended		3 Months Ended
	Mar. 31, 2014 USD ($)	Dec. 31, 2013 USD ($)	Mar. 31, 2014 Minimum [Member]	Mar. 31, 2014 Maximum [Member]	Mar. 31, 2014 Convertible Debt [Member] 3.375% Convertible Notes [Member] USD ($)	Dec. 31, 2013 Convertible Debt [Member] 3.375% Convertible Notes [Member] USD ($)	Sep. 27, 2013 Revolving Credit Agreement [Member] USD ($)	Mar. 31, 2014 Revolving Credit Agreement [Member] USD ($)	Dec. 31, 2013 Revolving Credit Agreement [Member] USD ($)	Sep. 27, 2013 Revolving Credit Agreement [Member] London Interbank Offered Rate (LIBOR) [Member] Minimum [Member]	Sep. 27, 2013 Revolving Credit Agreement [Member] London Interbank Offered Rate (LIBOR) [Member] Maximum [Member]	Sep. 27, 2013 Revolving Credit Agreement [Member] EUR (€)	Dec. 31, 2013 Revolving Credit Agreement [Member] Minimum [Member] USD ($)	Dec. 31, 2013 Revolving Credit Agreement [Member] Maximum [Member]	Sep. 27, 2013 Revolving Credit Agreement [Member] London Interbank Offered Rate (LIBOR) [Member]	Dec. 31, 2013 Revolving Credit Agreement [Member] Adjusted for Certain Acquisitons [Member] Maximum [Member]	Mar. 31, 2014 Lines of Credit and Overdrafts [Member] USD ($)	Dec. 31, 2013 Lines of Credit and Overdrafts [Member] USD ($)	Mar. 31, 2014 Foreign Bank Borrowings [Member] USD ($)	Dec. 31, 2013 Foreign Bank Borrowings [Member] USD ($)	Mar. 31, 2014 Lines of Credit [Member] USD ($)	Dec. 31, 2013 Lines of Credit [Member] USD ($)	Mar. 31, 2014 Bank Overdrafts [Member] USD ($)	Dec. 31, 2013 Bank Overdrafts [Member] USD ($)	Mar. 31, 2014 Capital Lease Obligations [Member] USD ($)	Dec. 31, 2013 Capital Lease Obligations [Member] USD ($)
Debt Instrument [Line Items]
Carrying amount of debt					$ 55,636	$ 55,636		$ 500,845	$ 487,920										$ 270	$ 405					$ 2,940	$ 3,120
Fair value of debt	585,085	563,886			76,114	76,569		503,798	482,431								1,636	1,074	273	410					3,264	3,402
Unamortized debt discount					0	(731)
Borrowings under lines of credit and overdrafts	1,636	1,074															1,636	1,074			1,000	1,000	636	74
Total debt, net of unamortized discounts	561,327	547,424
Less current maturities	(58,251)	(57,083)
Long-term debt	503,076	490,341
Convertible notes stated interest rate					3.375%
Guaranteed Cash Payment Upon Conversion Per Note					0
Convertible notes balance					55,636
Line of credit facility, maximum borrowing capacity							750,000					500,000									15,000
Line of credit facility with accordian feature, maximum borrowing capacity							1,000,000
Variable rate basis															LIBOR
Variable basis spread										1.10%	1.70%
Payments of debt issuance costs							1,261
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
Line of credit, interest rate at period end																					2.12%	2.13%
Repayment period																					7 days		2 days
Maturity of bank acceptances			3 months	6 months
Days Required for Closing Stock Price to be Greater or Equal to Threshold Percentage of Conversion Price					20 years
Total Measurement Days for Closing Stock Price to be Greater or Equal to Threshold Percentage of Conversion Price					30 years
Minimum Ratio Of Stock Price To Conversion Price For Conversion					130.00%