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DEBT -Narrative (Details) |  |  |  |  | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Aug. 28, 2015 USD ($) | Jul. 02, 2015 $ / shares | Jul. 02, 2014 USD ($) | Jun. 15, 2011 USD ($) $ / shares | Sep. 30, 2015 USD ($) shares | Sep. 30, 2015 USD ($) | Sep. 30, 2014 USD ($) | Jun. 10, 2015 convertible_debt_instrument | Dec. 31, 2014 USD ($)
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Amortization of debt issuance costs |  |  |  |  |  | $ 1,645,000 | $ 2,060,000 |  |
Carrying amount of liability |  |  |  |  | $ 216,604,000 | 216,604,000 |  |  | $ 213,121,000
Revolving Credit Facility |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Line of credit facility outstanding |  |  |  |  | $ 165,000,000 | $ 165,000,000 |  |  | $ 266,900,000
Weighted average interest rate on debt |  |  |  |  | 1.70% | 1.70% |  |  | 1.70%
Available borrowings under senior secured revolving credit facility |  |  |  |  | $ 586,900,000 | $ 586,900,000 |  |  |
Line of credit facility, fair value of amount outstanding |  |  |  |  | 153,700,000 | 153,700,000 |  |  |
Term Loan |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Line of credit facility outstanding |  |  |  |  | $ 348,100,000 | $ 348,100,000 |  |  |
Weighted average interest rate on debt |  |  |  |  | 1.70% | 1.70% |  |  |
Long-term debt, fair value |  |  |  |  | $ 326,200,000 | $ 326,200,000 |  |  |
Convertible Debt |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Principal amount outstanding |  |  |  | $ 230,000,000 | 227,097,000 | 227,097,000 |  |  | $ 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% |  |  |  |  |
Common stock based on initial conversion rate ratio (in shares) |  | 18.9287 |  | 17.4092 |  |  |  |  |
Principal amount to be considered for conversion purpose |  |  |  | $ 1,000 |  |  |  |  |
Initial conversion price, per share | $ / shares |  | $ 52.83 |  | $ 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 |
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 |  | $ 57.44 |  |  |  |  |
Strike price of warrant transactions (in dollars per share) | $ / shares |  | $ 64.43 |  | $ 70.05 |  |  |  |  |
Carrying amount of liability |  |  |  |  | $ 216,600,000 | 216,600,000 |  |  | 213,100,000
Unamortized discount |  |  |  |  | 10,500,000 | 10,500,000 |  |  | $ 16,900,000
Fair value of outstanding borrowings |  |  |  |  | $ 272,100,000 | $ 272,100,000 |  |  |
August 2015 Amendment |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Senior credit facility, maximum borrowing capacity | $ 1,100,000,000 |  |  |  |  |  |  |  |
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 |  |  |  |  |  |  |  |
August 2015 Amendment | Minimum |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Line of credit, commitment fee percentage | 0.15% |  |  |  |  |  |  |  |
August 2015 Amendment | Maximum |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Line of credit, commitment fee percentage | 0.30% |  |  |  |  |  |  |  |
August 2015 Amendment | Standby Letters of Credit |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Senior credit facility, maximum borrowing capacity | $ 60,000,000 |  |  |  |  |  |  |  |
August 2015 Amendment | Revolving Credit Facility |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Senior credit facility, maximum borrowing capacity | 750,000,000 |  |  |  |  |  |  |  |
August 2015 Amendment | Swingline Loan |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Senior credit facility, maximum borrowing capacity | $ 60,000,000 |  |  |  |  |  |  |  |
August 2015 Amendment | Federal Funds |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Interest rates available to the Company at its option | 0.50% |  |  |  |  |  |  |  |
August 2015 Amendment | (LIBOR) |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Interest rates available to the Company at its option | 1.00% |  |  |  |  |  |  |  |
August 2015 Amendment | Eurodollar | Minimum |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Interest rates available to the Company at its option | 1.00% |  |  |  |  |  |  |  |
August 2015 Amendment | Eurodollar | Maximum |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Interest rates available to the Company at its option | 1.75% |  |  |  |  |  |  |  |
August 2015 Amendment | Term Loan |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Senior credit facility, maximum borrowing capacity | $ 350,000,000 |  |  |  |  |  |  |  |
Proceeds from lines of credit | $ 200,000,000 |  |  |  |  |  |  |  |
July 2014 Amendment |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Proceeds from lines of credit |  |  | $ 422,000,000 |  |  |  |  |  |
Deferred finance costs, gross |  |  | 3,200,000 |  |  |  |  |  |
Amortization of debt issuance costs |  |  | 300,000 |  |  |  |  |  |
July 2014 Amendment | Revolving Credit Facility |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Proceeds from lines of credit |  |  | 272,000,000 |  |  |  |  |  |
July 2014 Amendment | Term Loan |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Proceeds from lines of credit |  |  | $ 150,000,000 |  |  |  |  |  |

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- Definition The notes are convertible if the average trading price per $1000 principal amount of notes is less than or equal to this percentage of the average conversion value of the notes during a period as defined in the indenture. + References No definition available. + Details
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- Definition Amount of noncash expense included in interest expense to issue debt and obtain financing associated with the related debt instruments. Alternate captions include noncash interest expense. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.8) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 8 -Article 9 + Details
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- Definition Fair value portion of debt instrument payable, including, but not limited to, notes payable and loans payable. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=49121117&loc=d3e13433-108611 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=49121117&loc=d3e13476-108611 + Details
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- Definition Contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition The amount of debt discount that was originally recognized at the issuance of the instrument that has yet to be amortized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 1A -URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28541-108399 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=34725769&loc=d3e28878-108400 + Details
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- Definition For an unclassified balance sheet, the amount as of the balance sheet date of capitalized costs associated with the issuance of debt instruments (for example, legal, accounting, underwriting, printing, and registration costs) that will be charged against earnings over the life of the debt instruments to which such costs pertain. Such amount is before the consideration of accumulated amortization. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28555-108399 + Details
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- Definition The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.16) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.16) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 20, 22 -Article 5 + Details
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- Definition The fee, expressed as a percentage of the line of credit facility, for the line of credit facility regardless of whether the facility has been used. + References No definition available. + Details
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- Definition Fair value of the amount outstanding under the credit facility. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=49121117&loc=d3e13433-108611 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=49121117&loc=d3e13476-108611 + Details
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- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition The fair value amount of long-term debt whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. + References No definition available. + Details
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