Debt (Details) (USD $) In Thousands, unless otherwise specified			9 Months Ended				0 Months Ended					0 Months Ended										9 Months Ended		9 Months Ended
	Sep. 30, 2013	Dec. 31, 2012	Sep. 30, 2013 Minimum [Member]	Sep. 30, 2013 Maximum [Member]	Sep. 30, 2013 Convertible Debt [Member] 3.375% Convertible Notes [Member]	Dec. 31, 2012 Convertible Debt [Member] 3.375% Convertible Notes [Member]	Sep. 27, 2013 Revolving Credit Agreement [Member]	Sep. 30, 2013 Revolving Credit Agreement [Member]	Dec. 31, 2012 Revolving Credit Agreement [Member]	Sep. 27, 2013 Revolving Credit Agreement [Member] Minimum [Member]	Sep. 27, 2013 Revolving Credit Agreement [Member] Maximum [Member]	Sep. 27, 2013 Revolving Credit Agreement [Member] London Interbank Offered Rate (LIBOR) [Member]	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] Adjusted for Certain Acquisitons [Member] Maximum [Member]	Sep. 30, 2013 Lines of Credit and Overdrafts [Member]	Dec. 31, 2012 Lines of Credit and Overdrafts [Member]	Sep. 30, 2013 Foreign Bank Borrowings [Member]	Dec. 31, 2012 Foreign Bank Borrowings [Member]	Sep. 30, 2013 Other Debt Obligations [Member]	Dec. 31, 2012 Other Debt Obligations [Member]	Sep. 30, 2013 Lines of Credit [Member]	Dec. 31, 2012 Lines of Credit [Member]	Sep. 30, 2013 Bank Overdrafts [Member]	Dec. 31, 2012 Bank Overdrafts [Member]
Debt Instrument [Line Items]
Carrying amount of debt					$ 55,636	$ 55,636		$ 285,600	$ 589,200									$ 540	$ 945	$ 3	$ 574
Fair value of debt	364,842	662,050			69,921	57,977		286,677	599,172							7,700	3,380	541	947	3	574
Unamortized debt discount					(1,346)	(3,122)
Borrowings under lines of credit and overdrafts	7,700	3,795														7,700	3,380					7,700	2,800		580
Total debt, net of unamortized discounts	348,133	646,613
Less current maturities	(62,533)	(4,494)
Long-term debt	285,600	642,119
Convertible notes stated interest rate					3.375%
Convertible notes balance					54,290
Line of credit facility, maximum borrowing capacity							750,000															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							1,159
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																						2.14%	2.16%
Repayment period																						7 days		2 days
Maturity of bank acceptances			3 months	6 months