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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% |  |  |  |  |

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