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DEBT (Narrative) (Details) - USD ($) $ / shares in Units, shares in Thousands |  |  |  | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Dec. 31, 2016 | Dec. 15, 2016 | Jul. 02, 2014 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 07, 2016 | Aug. 28, 2015 | Jul. 02, 2015 | Jun. 15, 2011
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Amortization of debt issuance costs |  |  |  | $ 2,529,000 | $ 2,264,000 | $ 2,571,000 |  |  |  |
Carrying amount of liability | $ 0 |  |  | 0 | 218,240,000 |  |  |  |  |
Principal amount paid |  |  |  | $ 184,313,000 | $ 2,519,000 | $ 0 |  |  |  |
Stock issued during period, shares, conversion of convertible securities (in shares) |  | 2,900 |  |  |  |  |  |  |  |
Common stock from the exercise of call option with hedge participants (in shares) |  | 2,900 |  | 2,946 |  |  |  |  |  |
Common stock from the exercise of call option with hedge participants, value |  |  |  | $ 123,100,000 |  |  |  |  |  |
Price per share (in dollars per share) | $ 41.78 |  |  |  |  |  |  |  |  |
Common Stock |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Stock issued during period, shares, conversion of convertible securities (in shares) |  | 2,900 |  | 2,946 |  |  |  |  |  |
Settlement of convertible notes |  | $ 122,000,000 |  | $ 29,000 |  |  |  |  |  |
Treasury Stock |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Common stock from the exercise of call option with hedge participants (in shares) |  |  |  | 2,946 |  |  |  |  |  |
Common stock from the exercise of call option with hedge participants, value |  |  |  | $ 123,051,000 |  |  |  |  |  |
Treasury Stock | Weighted Average |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Price per share (in dollars per share) | $ 41.78 |  |  |  |  |  |  |  |  |
Term Loan |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Weighted average interest rate on debt | 2.20% |  |  | 2.20% | 1.80% |  |  |  |  |
Term loan, amount outstanding | $ 500,000,000 |  |  | $ 500,000,000 | $ 346,200,000 |  |  |  |  |
Fair value of outstanding borrowings | 450,500,000 |  |  | 450,500,000 |  |  |  |  |  |
Convertible Debt |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Principal amount paid |  | 227,100,000 |  |  |  |  |  |  |  |
Gain or loss on extinguishment |  | $ 0 |  |  |  |  |  |  |  |
Strike price of the call transaction (in dollars per share) |  |  |  |  |  |  |  |  | $ 26.42 |
Strike price of warrant transactions (in dollars per share) |  |  |  |  |  |  |  |  | $ 32.22 |
December 2016 Amendment |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Senior credit facility, maximum borrowing capacity |  |  |  |  |  |  | $ 1,500,000,000.0 |  |  |
December 2016 Amendment | Term Loan |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Senior credit facility, maximum borrowing capacity |  |  |  |  |  |  | 500,000,000.0 |  |  |
December 2016 Amendment | Revolving Credit Facility |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Senior credit facility, maximum borrowing capacity |  |  |  |  |  |  | 1,000,000,000.0 |  |  |
December 2016 Amendment | Standby Letters of Credit |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Senior credit facility, maximum borrowing capacity |  |  |  |  |  |  | 60,000,000.0 |  |  |
December 2016 Amendment | Swingline Loan |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Senior credit facility, maximum borrowing capacity |  |  |  |  |  |  | $ 60,000,000.0 |  |  |
August 2015 Amendment | Term Loan |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Senior credit facility, maximum borrowing capacity |  |  |  |  |  |  |  | $ 350,000,000.0 |  |
August 2015 Amendment | Revolving Credit Facility |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Senior credit facility, maximum borrowing capacity |  |  |  |  |  |  |  | $ 750,000,000.0 |  |
July 2014 Amendment |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Cash balance threshold above which excess amount is not subject to any restriction of use or investment |  |  | $ 40,000,000 |  |  |  |  |  |  |
Capitalized incremental financing costs | 4,500,000 |  |  | 4,500,000 | 1,400,000 |  |  |  |  |
Amortization of debt issuance costs |  |  |  | 500,000 |  |  |  |  |  |
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% |  |  |  |  |  |  |
July 2014 Amendment | Eurodollar |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Interest rates available to the company at its option |  |  | 1.00% |  |  |  |  |  |  |
July 2014 Amendment | Eurodollar | Minimum |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Interest rates available to the company at its option |  |  | 1.00% |  |  |  |  |  |  |
July 2014 Amendment | Eurodollar | Maximum |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Interest rates available to the company at its option |  |  | 1.75% |  |  |  |  |  |  |
July 2014 Amendment | Federal Funds |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Interest rates available to the company at its option |  |  | 0.50% |  |  |  |  |  |  |
Senior Credit Facility |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Line of credit facility outstanding | $ 165,000,000 |  |  | $ 165,000,000 | $ 150,000,000 |  |  |  |  |
Weighted average interest rate on debt | 2.20% |  |  | 2.20% | 1.90% |  |  |  |  |
Available borrowings under senior secured revolving credit facility | $ 835,000,000 |  |  | $ 835,000,000 |  |  |  |  |  |
Fair value of outstanding borrowings | 147,700,000 |  |  | 147,700,000 |  |  |  |  |  |
Senior Credit Facility | Standby Letters of Credit |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Line of credit facility outstanding | $ 500,000 |  |  | 500,000 | $ 0 |  |  |  |  |
Amounts drawn |  |  |  | $ 0 |  |  |  |  |  |
2016 Convertible Senior Notes |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Principal amount outstanding |  |  |  |  | 227,100,000 |  |  |  |  | $ 230,000,000
Interest rate on debt | 1.625% |  |  | 1.625% |  |  |  |  |  | 1.625%
Carrying amount of liability |  |  |  |  | 218,700,000 |  |  |  |  |
Unamortized discount |  |  |  |  | $ 8,400,000 |  |  |  |  |
Strike price of the call transaction (in dollars per share) | $ 28.72 |  |  | $ 28.72 |  |  |  |  |  |
Strike price of warrant transactions (in dollars per share) | $ 35.03 |  |  | $ 35.03 |  |  |  |  |  |

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- Definition Amount, before accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs. + 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=64930785&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 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 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 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 + Details
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