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DEBT (Narrative) (Details) - USD ($) |  | 1 Months Ended | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Dec. 15, 2016 | Oct. 31, 2017 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Mar. 31, 2017 | Mar. 30, 2017 | Jul. 31, 2015 | Jun. 15, 2011
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  |  |  | $ 2,200,000,000.0 | $ 1,500,000,000.0 |  |
Amortization of debt issuance costs |  |  | $ 2,722,000 | $ 2,529,000 | $ 2,264,000 |  |  |  |
Amount drawn from loan |  |  | 1,307,000,000 | 680,000,000 | 545,000,000 |  |  |  |
Principal amount paid |  |  | 0 | 184,313,000 | $ 2,519,000 |  |  |  |
Common stock from the exercise of call option with hedge participants (in shares) | 2,900,000 |  |  |  |  |  |  |  |
Common stock from the exercise of call option with hedge participants, value |  |  | $ 121,600,000 | $ 123,100,000 |  |  |  |  |
Price per share (in dollars per share) |  |  | $ 41.77 | $ 41.78 |  |  |  |  |
Convertible Debt |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Strike price of the call transaction (in dollars per share) |  |  |  |  |  |  |  | $ 26.42 | $ 28.72
Strike price of warrant transactions (in dollars per share) |  |  |  |  |  |  |  | $ 32.22 | $ 35.03
Warrants exercised (in shares) |  |  | 8,707,202 |  |  |  |  |  |
Common stock from the exercise of warrants (in shares) |  |  | 2,839,743 |  |  |  |  |  |
Warrants outstanding (in shares) |  |  | 0 |  |  |  |  |  |
Revolving Credit Facility |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  |  |  | 1,000,000,000 |  |  |
Line of credit facility outstanding |  |  | $ 655,000,000 | $ 165,000,000 |  |  |  |  |
Weighted average interest rate on debt |  |  | 3.70% | 2.20% |  |  |  |  |
Revolving Credit Facility | Level 2 |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Outstanding borrowings |  |  | $ 661,000,000 |  |  |  |  |  |
Standby Letters of Credit |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  |  |  | 60,000,000 |  |  |
Swingline Loan |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  |  |  | 60,000,000 |  |  |
Term Loan A Facility | Secured Debt |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  |  |  | 500,000,000.0 |  |  |
Line of credit facility outstanding |  |  | $ 500,000,000 | $ 500,000,000 |  |  |  |  |
Weighted average interest rate on debt |  |  | 3.60% | 2.20% |  |  |  |  |
Term Loan A Facility | Secured Debt | Level 2 |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Outstanding borrowings |  |  | $ 502,700,000 |  |  |  |  |  |
Term loan A-1 | Secured Debt |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  |  |  | $ 700,000,000 |  |  |
Capitalized incremental financing costs |  | $ 19,100,000 |  |  |  |  |  |  |
Amount drawn from loan |  | $ 700,000,000 |  |  |  |  |  |  |
Line of credit facility outstanding |  |  | 700,000,000 |  |  |  |  |  |
Term loan A-1 | Secured Debt | Level 2 |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Outstanding borrowings |  |  | 703,700,000 |  |  |  |  |  |
Senior Credit Facility |  |  |  |  |  |  |  |  |
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 |  |  | $ 19,100,000 | $ 4,500,000 |  |  |  |  |
Senior Credit Facility | Minimum |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Line of credit, commitment fee percentage |  |  | 0.15% |  |  |  |  |  |
Senior Credit Facility | Maximum |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Line of credit, commitment fee percentage |  |  | 0.35% |  |  |  |  |  |
Senior Credit Facility | Eurodollar | Minimum |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Interest rates available to the company at its option |  |  | 1.00% |  |  |  |  |  |
Senior Credit Facility | Eurodollar | Maximum |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Interest rates available to the company at its option |  |  | 2.00% |  |  |  |  |  |
Senior Credit Facility | Federal Funds |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Interest rates available to the company at its option |  |  | 0.50% |  |  |  |  |  |
Senior Credit Facility | One Month Eurodollar Rate |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Interest rates available to the company at its option |  |  | 1.00% |  |  |  |  |  |
Senior Credit Facility | Standby Letters of Credit |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Line of credit facility outstanding |  |  | $ 0 |  |  |  |  |  |
Letters of credit outstanding |  |  | 600,000 | 500,000 |  |  |  |  |
July 2014 Amendment |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Amortization of debt issuance costs |  |  | $ 0 | $ 500,000 |  |  |  |  |
2016 Convertible Senior Notes |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Principal amount outstanding |  |  |  |  |  |  |  |  | $ 230,000,000
Interest rate on debt |  |  |  | 1.625% | 1.625% |  |  |  |
2016 Convertible Senior Notes | Convertible Debt |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Principal amount paid | $ 227,100,000 |  |  |  |  |  |  |  |
Stock issued during period, shares, conversion of convertible securities (in shares) | 2,900,000 |  |  |  |  |  |  |  |
Settlement of convertible notes | $ 122,000,000 |  |  |  |  |  |  |  |
Gain or loss on extinguishment | $ 0 |  |  |  |  |  |  |  |
Interest rate on debt | 1.625% |  |  |  |  |  |  |  |

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