DEBT -Narrative (Details)			6 Months Ended
	Jul. 02, 2014 USD ($)	Jun. 15, 2011 USD ($) $ / shares	Jun. 30, 2015 USD ($)	Jun. 30, 2014 USD ($)	Jun. 16, 2015 convertible_debt_instrument	Dec. 31, 2014 USD ($)
Debt Instrument [Line Items]
Amortization of debt issuance costs			$ 1,060,000	$ 1,243,000
Term loan, amount outstanding			150,000,000
Carrying amount of liability			$ 214,358,000			$ 213,121,000
July 2014 Amendment
Debt Instrument [Line Items]
Senior credit facility, maximum borrowing capacity	$ 900,000,000
Additional commitments	200,000,000
Cash balance threshold above which excess amount is not subject to any restriction of use or investment	40,000,000
Deferred finance costs, gross	3,200,000
Amortization of debt issuance costs	$ 300,000
July 2014 Amendment | Minimum
Debt Instrument [Line Items]
Line of credit, commitment fee percentage	0.15%
July 2014 Amendment | Maximum
Debt Instrument [Line Items]
Line of credit, commitment fee percentage	0.30%
Proceeds from lines of credit	$ 422,000,000
July 2014 Amendment | Standby Letters of Credit
Debt Instrument [Line Items]
Senior credit facility, maximum borrowing capacity	60,000,000
July 2014 Amendment | Revolving Credit Facility
Debt Instrument [Line Items]
Senior credit facility, maximum borrowing capacity	750,000,000
Proceeds from lines of credit	272,000,000
July 2014 Amendment | Swingline Loan
Debt Instrument [Line Items]
Senior credit facility, maximum borrowing capacity	60,000,000
Term Loan
Debt Instrument [Line Items]
Weighted average interest rate on debt			1.80%
Long-term debt, fair value			$ 143,000,000
June 2011 Amendment | Revolving Credit Facility
Debt Instrument [Line Items]
Senior credit facility, maximum borrowing capacity	600,000,000
Revolving Credit Facility
Debt Instrument [Line Items]
Line of credit facility outstanding			$ 286,900,000			$ 266,900,000
Weighted average interest rate on debt			2.00%			1.70%
Available borrowings under senior secured revolving credit facility			$ 463,100,000
Line of credit facility, fair value of amount outstanding			269,100,000
2016 Convertible Senior Notes
Debt Instrument [Line Items]
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			217,300,000			213,100,000
Unamortized discount			12,700,000			$ 16,900,000
Fair value of outstanding borrowings			$ 285,800,000
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 | $ / shares		$ 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%
Number debt instruments pending conversion | convertible_debt_instrument					2,903
Strike price of the call transaction (in dollars per share) | $ / shares		$ 57.44
Strike price of warrant transactions (in dollars per share) | $ / shares		$ 70.05
Term Loan | July 2014 Amendment
Debt Instrument [Line Items]
Senior credit facility, maximum borrowing capacity	150,000,000
Proceeds from lines of credit	$ 150,000,000
Federal Funds | July 2014 Amendment
Debt Instrument [Line Items]
Interest rates available to the Company at its option	0.50%
(LIBOR) | July 2014 Amendment
Debt Instrument [Line Items]
Interest rates available to the Company at its option	1.00%
Eurodollar | July 2014 Amendment | Minimum
Debt Instrument [Line Items]
Interest rates available to the Company at its option	1.00%
Eurodollar | July 2014 Amendment | Maximum
Debt Instrument [Line Items]
Interest rates available to the Company at its option	1.75%