DEBT (Narrative) (Details)				12 Months Ended
	Aug. 28, 2015 USD ($)	Jul. 02, 2015 $ / shares	Jul. 02, 2014 USD ($)	Dec. 31, 2015 USD ($) $ / shares shares	Dec. 31, 2014 USD ($)	Dec. 31, 2013 USD ($)	Jun. 10, 2015 convertible_debt_instrument	Jun. 15, 2011 USD ($)
Debt Instrument [Line Items]
Amortization of debt issuance costs				$ 2,264,000	$ 2,571,000	$ 2,298,000
Carrying amount of liability				218,720,000	213,121,000
July 2014 Amendment
Debt Instrument [Line Items]
Senior credit facility, maximum borrowing capacity			$ 1,100,000,000
Cash balance threshold above which excess amount is not subject to any restriction of use or investment			40,000,000
Capitalized incremental financing costs			3,200,000	1,400,000
Amortization of debt issuance costs			$ 300,000	0
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%
Senior Credit Facility
Debt Instrument [Line Items]
Line of credit facility outstanding				$ 150,000,000	$ 266,900,000
Weighted average interest rate on debt				1.90%	1.70%
Available borrowings under senior secured revolving credit facility				$ 600,000,000
Fair value of outstanding borrowings				139,800,000
2016 Convertible Senior Notes
Debt Instrument [Line Items]
Fair value of outstanding borrowings				297,400,000
Principal amount outstanding				227,097,000	$ 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
Debt Instrument, interest rate, effective percentage								5.60%
Carrying amount of liability				218,700,000	213,100,000
Unamortized discount				$ 8,400,000	16,900,000
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%
Earliest conversion date				June 15, 2016
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
Amortization of debt discount (premium), interest costs capitalized				$ 600,000	900,000	1,000,000
Interest expense, debt, excluding amortization, interest costs capitalized				$ 300,000	$ 400,000	$ 500,000
Revolving Credit Facility | July 2014 Amendment
Debt Instrument [Line Items]
Senior credit facility, maximum borrowing capacity			$ 750,000,000
Standby Letters of Credit | July 2014 Amendment
Debt Instrument [Line Items]
Senior credit facility, maximum borrowing capacity			60,000,000
Swingline Loan | July 2014 Amendment
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%	1.70%
Term loan, amount outstanding				$ 346,200,000	$ 150,000,000
Fair value of outstanding borrowings				324,900,000
Term Loan | July 2014 Amendment
Debt Instrument [Line Items]
Senior credit facility, maximum borrowing capacity			$ 350,000,000
Term Loan | August Two Thousand Fifteen Amendment
Debt Instrument [Line Items]
Proceeds from lines of credit	$ 200,000,000
Convertible Debt
Debt Instrument [Line Items]
Common stock based on initial conversion rate ratio (in shares)		18.9287
Initial conversion price, per share | $ / shares		$ 52.83
Debt instrument, convertible, number of debt instruments pending conversion | convertible_debt_instrument							2,903
Repayments of debt				$ 2,900,000
Stock issued during period, shares, conversion of convertible securities | shares				8,457
Strike price of the call transaction (in dollars per share) | $ / shares		52.83
Strike price of warrant transactions (in dollars per share) | $ / shares		$ 64.43
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%
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%