DEBT -Narrative (Details) (USD $)					0 Months Ended				0 Months Ended							0 Months Ended			0 Months Ended		0 Months Ended
	Sep. 30, 2014	Dec. 31, 2013		Jul. 02, 2014 July Two Thousand Fourteen Amendment [Member]	Jul. 02, 2014 July Two Thousand Fourteen Amendment [Member] Minimum	Jul. 02, 2014 July Two Thousand Fourteen Amendment [Member] Maximum	Jul. 02, 2014 July Two Thousand Fourteen Amendment [Member] Maximum	Jul. 02, 2014 July Two Thousand Fourteen Amendment [Member] Standby Letters of Credit [Member] Maximum	Jul. 02, 2014 July Two Thousand Fourteen Amendment [Member] Revolving Credit Facility	Jul. 02, 2014 July Two Thousand Fourteen Amendment [Member] Revolving Credit Facility Maximum	Jul. 02, 2014 July Two Thousand Fourteen Amendment [Member] Swingline Loan [Member] Maximum	Sep. 30, 2014 Term Loan [Member]	Jul. 02, 2014 June Two Thousand Eleven Amendment [Member] Revolving Credit Facility Maximum	Sep. 30, 2014 Revolving Credit Facility	Dec. 31, 2013 Revolving Credit Facility	Jun. 15, 2011 2016 Convertible Senior Notes	Sep. 30, 2014 2016 Convertible Senior Notes	Dec. 31, 2013 2016 Convertible Senior Notes	Jul. 02, 2014 Term Loan [Member] July Two Thousand Fourteen Amendment [Member]	Jul. 02, 2014 Term Loan [Member] July Two Thousand Fourteen Amendment [Member] Maximum	Jul. 02, 2014 Federal Funds [Member] July Two Thousand Fourteen Amendment [Member]	Jul. 02, 2014 London Interbank Offered Rate (LIBOR) [Member] July Two Thousand Fourteen Amendment [Member]	Jul. 02, 2014 Eurodollar [Member] July Two Thousand Fourteen Amendment [Member] Minimum	Jul. 02, 2014 Eurodollar [Member] July Two Thousand Fourteen Amendment [Member] Maximum
Debt Instrument [Line Items]
Senior credit facility, maximum borrowing capacity							$ 900,000,000	$ 60,000,000		$ 750,000,000	$ 60,000,000		$ 600,000,000							$ 150,000,000
Additional commitments				200,000,000
Interest rates available to the Company at its option																					0.50%	1.00%	1.00%	1.75%
Cash balance threshold above which excess amount is not subject to any restriction of use or investment				40,000,000
Line of credit, commitment fee percentage					0.15%	0.30%
Proceeds from Lines of Credit						422,000,000			272,000,000										150,000,000
Line of credit facility outstanding														261,900,000	186,900,000
Weighted average interest rate on debt												1.70%		1.70%	2.00%
Available borrowings under senior secured revolving credit facility														488,100,000
term loan, amount outstanding	150,000,000
Line of Credit Facility, Fair Value of Amount Outstanding														241,400,000
Long-term Debt, Fair Value												139,058,000
Fair value of outstanding borrowings																	247,700,000
Principal amount outstanding																230,000,000	230,000,000	230,000,000
Interest rate on debt																1.625%
Portion of the debt proceeds that was classified as equity at the time of the offering																43,200,000
Effective interest rate implicit in the liability component																5.60%
Carrying amount of liability	211,095,000	205,182,000	[1]														211,100,000	205,200,000
Unamortized discount																	18,900,000	24,800,000
Common stock based on initial conversion rate ratio (in shares)																17.4092
Principal amount to be considered for conversion purpose																1,000
Initial conversion price, per share																$ 57.44
Maximum selling price of company's common stock																150.00%
Principal amount of notes per average trading price																$ 1,000
Maximum average conversion value of the Notes																98.00%
Earliest conversion date																June 15, 2016
Strike price of the call transaction (in dollars per share)																$ 57.44
Strike price of warrant transactions (in dollars per share)																$ 70.05

[1] See Note 1 of these condensed consolidated financial statements for discussion of the impact of the change in accounting for the medical device excise tax.