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DEBT (Details) |  |  | 12 Months Ended |  |
--- | --- | --- | --- | --- | ---
Aug. 28, 2015 USD ($) | Jun. 15, 2011 USD ($) $ / shares | Dec. 31, 2015 USD ($) shares | Jun. 30, 2016 USD ($) | Jun. 10, 2015 convertible_debt_instrument
2016 Notes: |  |  |  |  |
Carrying amount of liability |  |  | $ 218,240,000 | $ 223,041,000 |
Revolving Credit Facility |  |  |  |  |
2016 Notes: |  |  |  |  |
Line of credit facility outstanding |  |  | $ 150,000,000 | $ 140,000,000 |
Weighted average interest rate on debt |  |  | 1.90% | 2.10% |
Available borrowings under senior secured revolving credit facility |  |  |  | $ 610,000,000 |
Line of credit facility, fair value of amount outstanding |  |  |  | 134,500,000 |
Term Loan |  |  |  |  |
2016 Notes: |  |  |  |  |
Line of credit facility outstanding |  |  | $ 346,200,000 | $ 342,500,000 |
Weighted average interest rate on debt |  |  | 1.80% | 2.10% |
Long-term debt, fair value |  |  |  | $ 330,300,000 |
Convertible Debt |  |  |  |  |
2016 Notes: |  |  |  |  |
Deferred finance costs, gross |  |  | $ 500,000 |  |
Principal amount outstanding |  | $ 230,000,000 | 227,100,000 | 227,096,000 |
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 |  |  | 218,200,000 | 223,000,000 |
Unamortized discount |  |  | 8,400,000 | 4,100,000 |
Fair value of outstanding borrowings |  |  |  | $ 343,200,000 |
Common stock based on initial conversion rate ratio (in shares) |  | 18.9287 |  |  |
Initial conversion price (in dollars per share) | $ / shares |  | $ 52.83 |  |  |
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 (less than or equal to) |  | 98.00% |  |  |
Number 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 |  |  |
August 2015 Amendment |  |  |  |  |
2016 Notes: |  |  |  |  |
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 |  |  |  |
August 2015 Amendment | Minimum |  |  |  |  |
2016 Notes: |  |  |  |  |
Line of credit, commitment fee percentage | 0.15% |  |  |  |
August 2015 Amendment | Maximum |  |  |  |  |
2016 Notes: |  |  |  |  |
Line of credit, commitment fee percentage | 0.30% |  |  |  |
August 2015 Amendment | Revolving Credit Facility |  |  |  |  |
2016 Notes: |  |  |  |  |
Senior credit facility, maximum borrowing capacity | $ 750,000,000 |  |  |  |
August 2015 Amendment | Standby Letters of Credit |  |  |  |  |
2016 Notes: |  |  |  |  |
Senior credit facility, maximum borrowing capacity | 60,000,000 |  |  |  |
August 2015 Amendment | Swingline Loan |  |  |  |  |
2016 Notes: |  |  |  |  |
Senior credit facility, maximum borrowing capacity | $ 60,000,000 |  |  |  |
August 2015 Amendment | Eurodollar |  |  |  |  |
2016 Notes: |  |  |  |  |
Interest rates available to the Company at its option | 1.00% |  |  |  |
August 2015 Amendment | Eurodollar | Minimum |  |  |  |  |
2016 Notes: |  |  |  |  |
Interest rates available to the Company at its option | 1.00% |  |  |  |
August 2015 Amendment | Eurodollar | Maximum |  |  |  |  |
2016 Notes: |  |  |  |  |
Interest rates available to the Company at its option | 1.75% |  |  |  |
August 2015 Amendment | Federal Funds |  |  |  |  |
2016 Notes: |  |  |  |  |
Interest rates available to the Company at its option | 0.50% |  |  |  |
August 2015 Amendment | Term Loan |  |  |  |  |
2016 Notes: |  |  |  |  |
Senior credit facility, maximum borrowing capacity | $ 350,000,000 |  |  |  |
August 2015 Amendment | Term Loan | Maximum |  |  |  |  |
2016 Notes: |  |  |  |  |
Proceeds from lines of credit | $ 200,000,000 |  |  |  |
July 2014 Amendment |  |  |  |  |
2016 Notes: |  |  |  |  |
Deferred finance costs, gross |  |  | $ 1,400,000 |  |

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