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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% |  |  |  |  |

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