Debt (Details) In Thousands, unless otherwise specified	9 Months Ended			0 Months Ended	9 Months Ended				0 Months Ended							0 Months Ended					0 Months Ended						9 Months Ended		9 Months Ended
	Sep. 30, 2014 USD ($)	Sep. 30, 2013 USD ($)	Dec. 31, 2013 USD ($)	Jun. 24, 2014 Convertible Debt [Member] 3.375% Convertible Notes [Member] USD ($)	Sep. 30, 2014 Convertible Debt [Member] 3.375% Convertible Notes [Member] USD ($)	Jun. 24, 2014 Convertible Debt [Member] 3.375% Convertible Notes [Member] USD ($)	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. 27, 2013 Revolving Credit Agreement [Member] USD ($)	Sep. 30, 2014 Revolving Credit Agreement [Member] USD ($)	Dec. 31, 2013 Revolving Credit Agreement [Member] USD ($)	Sep. 30, 2014 Revolving Credit Agreement [Member] Euro Member Countries, Euro USD ($)	Sep. 30, 2014 Revolving Credit Agreement [Member] Euro Member Countries, Euro EUR (€)	Dec. 31, 2013 Revolving Credit Agreement [Member] Euro Member Countries, Euro USD ($)	Dec. 31, 2013 Revolving Credit Agreement [Member] Euro Member Countries, Euro EUR (€)	Sep. 27, 2013 Revolving Credit Agreement [Member] London Interbank Offered Rate (LIBOR) [Member] Minimum [Member]	Sep. 27, 2013 Revolving Credit Agreement [Member] London Interbank Offered Rate (LIBOR) [Member] Maximum [Member]	Sep. 27, 2013 Revolving Credit Agreement [Member] EUR (€)	Dec. 31, 2013 Revolving Credit Agreement [Member] Minimum [Member] USD ($)	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]	Sep. 30, 2014 Lines of Credit and Overdrafts [Member] USD ($)	Dec. 31, 2013 Lines of Credit and Overdrafts [Member] USD ($)	Sep. 30, 2014 Foreign Bank Borrowings [Member] USD ($)	Dec. 31, 2013 Foreign Bank Borrowings [Member] USD ($)	Sep. 30, 2014 Lines of Credit [Member] USD ($)	Dec. 31, 2013 Lines of Credit [Member] USD ($)	Sep. 30, 2014 Bank Overdrafts [Member] USD ($)	Dec. 31, 2013 Bank Overdrafts [Member] USD ($)	Sep. 30, 2014 Capital Lease Obligations [Member] USD ($)	Dec. 31, 2013 Capital Lease Obligations [Member] USD ($)
Debt Instrument [Line Items]
Carrying amount of debt					$ 0			$ 55,636		$ 510,557	$ 487,920	$ 82,257	€ 64,820	$ 157,320	€ 114,000										$ 0	$ 405					$ 3,543	$ 3,120
Fair value of debt	549,603		563,886		0			76,569		520,029	482,431												25,695	1,074	0	410					3,879	3,402
Unamortized debt discount					0			(731)
Borrowings under lines of credit and overdrafts	25,695		1,074																				25,695	1,074			25,500	1,000	195	74
Total debt, net of unamortized discounts	539,795		547,424
Less current maturities	(26,580)		(57,083)
Long-term debt	513,215		490,341
Stated interest rate					3.375%					1.45%	1.36%
Converted amount with accrued interest				7
Convertible note repurchases, par value							224
Converted amount				55,405
Convertible debt						55,412
Repayments of convertible debt, including premium on conversion				70,497
Premium paid on convertible debt redemption	14,868	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
Line of credit facility, maximum borrowing capacity									750,000									500,000									40,000
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
Remaining borrowing capacity										239,443	262,080
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																											1.16%	2.13%
Repayment period																											1 month		2 days
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%