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DEBT (Narrative) (Details) (USD $) |  |  |  |  | 12 Months Ended | 0 Months Ended |  | 0 Months Ended |  |  |  | 12 Months Ended |  |  | 12 Months Ended |  |
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Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2013 Senior Credit Facility | Dec. 31, 2012 Senior Credit Facility | Dec. 31, 2013 Senior Credit Facility Option ii, X | Dec. 31, 2013 Senior Credit Facility Option ii, Z | Dec. 31, 2013 Senior Credit Facility Minimum | Dec. 31, 2013 Senior Credit Facility Minimum Option i | Dec. 31, 2013 Senior Credit Facility Maximum | Dec. 31, 2013 Senior Credit Facility Maximum Option i | Jun. 08, 2011 Senior Credit Facility August 2010 Amendment | Jun. 08, 2011 Senior Credit Facility August 2010 Amendment Maximum | Jun. 08, 2011 Senior Credit Facility June 2011 Amendment | Jun. 08, 2011 Senior Credit Facility June 2011 Amendment Maximum | May 11, 2012 Senior Credit Facility May 2012 Amendment | May 11, 2012 Senior Credit Facility May 2012 Amendment Minimum | May 11, 2012 Senior Credit Facility May 2012 Amendment Maximum | Jun. 21, 2013 Senior Credit Facility June 2013 Amendment | Jun. 21, 2013 Senior Credit Facility June 2013 Amendment Maximum | Dec. 31, 2013 2016 Convertible Senior Notes | Dec. 31, 2012 2016 Convertible Senior Notes | Jun. 15, 2011 2016 Convertible Senior Notes | Dec. 31, 2012 2012 Senior Convertible Notes | Jun. 11, 2007 2012 Senior Convertible Notes | Jun. 21, 2013 Leverage Ratio June 21, 2013 through June 30, 2014 Senior Credit Facility June 2013 Amendment Maximum | Jun. 21, 2013 Leverage Ratio July 01, 2014 through March 31, 2015 Senior Credit Facility June 2013 Amendment Maximum
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Senior credit facility, maximum borrowing capacity |  |  |  |  |  |  |  |  |  |  |  | $ 450,000,000 |  | $ 600,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Reallocated term loan |  |  |  |  |  |  |  |  |  |  |  |  | 150,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Senior credit facility, additional commitments |  |  |  |  |  |  |  |  |  |  |  |  | 200,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Line of credit facility, expiration date |  |  |  |  |  |  |  |  |  |  | Aug. 10, 2015 |  | Jun. 08, 2016 |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum consolidated total leverage ratio (net debt to consolidated EBITDA) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1 | 3.75 |  | 3.75 |  |  |  |  |  | 4.25 | 4.00
Capitalized incremental financing costs |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 400,000 |  |  | 1,100,000 |  |  |  |  |  |  |  |
Interest rates available to the Company at its option |  |  |  |  | 0.50% | 1.00% |  | 1.00% |  | 1.75% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash balance threshold above which excess amount is not subject to any restriction of use or investment |  |  | 40,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of credit, commitment fee percentage |  |  |  |  |  |  | 0.15% |  | 0.30% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of credit facility outstanding |  |  | 186,900,000 | 321,900,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted average interest rate on debt |  |  | 2.00% | 1.80% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Available borrowings under senior secured revolving credit facility |  |  | 413,100,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair value of outstanding borrowings |  |  | 187,700,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 252,400,000 |  |  |  |  |  |
Principal amount outstanding |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 230,000,000 | 230,000,000 | 230,000,000 |  | 165,000,000 |  |
Interest rate on debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1.625% |  | 2.375% |  |
Portion of the debt proceeds that was classified as equity at the time of the offering |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 43,200,000 |  | 30,600,000 |  |
Debt Instrument, Interest Rate, Effective Percentage |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5.60% |  | 6.80% |  |
Carrying amount of liability | 205,182,000 | 197,672,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 205,200,000 | 197,700,000 |  |  |  |  |
Unamortized discount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 24,800,000 | 32,300,000 |  |  |  |  |
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 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 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% |  |  |  |  |  |
Earliest conversion date |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | June 15, 2016 |  |  |  |  |  |
Strike price of the call transaction (in dollars per share) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 57.44 |  |  |  |  |  |
Strike price of warrant transactions (in dollars per share) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 70.05 |  |  |  |  |  |
Cost of call transactions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 30,400,000 |  |
Proceeds from warrant transactions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 12,200,000 |  |
Bond hedge contract termination, trading day period (in days) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 100 days |  |  |
Bond hedge contract termination, commencement period (in days) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 90 days |  |  |

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