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Long-Term Debt (Details 2) (USD $) | 1 Months Ended | 12 Months Ended |  | 12 Months Ended |  | 12 Months Ended |  | 12 Months Ended | 1 Months Ended | 3 Months Ended | 12 Months Ended |  | 12 Months Ended |  | 12 Months Ended | 1 Months Ended | 3 Months Ended | 12 Months Ended |  | 1 Months Ended |  | 12 Months Ended |  | 12 Months Ended |  | 12 Months Ended | 1 Months Ended |  | 12 Months Ended |  | 12 Months Ended |  | 1 Months Ended
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Nov. 30, 2010 | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2012 7.25% senior notes due December 2018 | Nov. 30, 2010 7.25% senior notes due December 2018 | Dec. 31, 2012 7.25% senior notes due December 2018 Prior to December 1, 2013 | Dec. 31, 2012 7.25% senior notes due December 2018 Twelve month period beginning December 1, 2013 | Dec. 31, 2012 7.25% senior notes due December 2018 Twelve month period beginning December 1, 2014 | Dec. 31, 2012 7.25% senior notes due December 2018 Twelve month period beginning December 1, 2015 | Dec. 31, 2012 7.25% senior notes due December 2018 Beginning December 1, 2016 and thereafter | Dec. 31, 2012 4.25% convertible senior notes due June 2014 | Dec. 31, 2011 4.25% convertible senior notes due June 2014 | Dec. 31, 2010 4.25% convertible senior notes due June 2014 | Jun. 30, 2009 4.25% convertible senior notes due June 2014 | Dec. 31, 2012 4.75% convertible senior notes due January 2014 | Dec. 31, 2003 4.75% convertible senior notes due January 2014 | Dec. 31, 2012 4.75% convertible senior notes due January 2014 January 15, 2011 to January 14, 2013 | Dec. 31, 2012 4.75% convertible senior notes due January 2014 January 15, 2013 and thereafter | Mar. 31, 2012 Revolving credit facility due July 2016 | Jul. 31, 2011 Revolving credit facility due July 2016 | Mar. 31, 2012 Revolving credit facility due July 2016 | Sep. 30, 2011 Revolving credit facility due July 2016 | Dec. 31, 2012 Revolving credit facility due July 2016 | Dec. 31, 2012 Revolving credit facility due July 2016 LIBOR | Dec. 31, 2012 Revolving credit facility due July 2016 LIBOR Low end of range | Dec. 31, 2012 Revolving credit facility due July 2016 LIBOR High end of range | Dec. 31, 2012 Revolving credit facility due July 2016 Base rate loans | Dec. 31, 2012 Revolving credit facility due July 2016 Base rate loans Low end of range | Dec. 31, 2012 Revolving credit facility due July 2016 Base rate loans High end of range | Dec. 31, 2012 Revolving credit facility due July 2016 Federal Funds | Dec. 31, 2012 Revolving credit facility due July 2016 one-month LIBOR | Mar. 31, 2011 Asset Backed Securitization Facility | Nov. 30, 2010 Partnership's asset-backed securitization facility | Nov. 30, 2010 Partnership's revolving credit facility and term loan facility due November 2015 | Mar. 31, 2012 Partnership's revolving credit facility and term loan facility due November 2015 | Dec. 31, 2012 Partnership's revolving credit facility and term loan facility due November 2015 | Nov. 30, 2011 Partnership's revolving credit facility and term loan facility due November 2015 | Mar. 31, 2012 Partnership's revolving credit facility due November 2015 | Mar. 31, 2011 Partnership's revolving credit facility due November 2015 | Nov. 30, 2010 Partnership's revolving credit facility due November 2015 | Dec. 31, 2012 Partnership's revolving credit facility due November 2015 | Dec. 31, 2012 Partnership's revolving credit facility due November 2015 LIBOR | Dec. 31, 2012 Partnership's revolving credit facility due November 2015 LIBOR Low end of range | Dec. 31, 2012 Partnership's revolving credit facility due November 2015 LIBOR High end of range | Dec. 31, 2012 Partnership's revolving credit facility due November 2015 Base rate loans | Dec. 31, 2012 Partnership's revolving credit facility due November 2015 Base rate loans Low end of range | Dec. 31, 2012 Partnership's revolving credit facility due November 2015 Base rate loans High end of range | Dec. 31, 2012 Partnership's revolving credit facility due November 2015 Federal Funds | Dec. 31, 2012 Partnership's revolving credit facility due November 2015 one-month LIBOR | Nov. 30, 2010 Partnership's term loan facility due November 2015 | Dec. 31, 2012 Partnership's term loan facility due November 2015 | Dec. 31, 2012 Partnership's term loan facility due November 2015 LIBOR | Dec. 31, 2012 Partnership's term loan facility due November 2015 LIBOR Low end of range | Dec. 31, 2012 Partnership's term loan facility due November 2015 LIBOR High end of range | Dec. 31, 2012 Partnership's term loan facility due November 2015 Base rate loans | Dec. 31, 2012 Partnership's term loan facility due November 2015 Base rate loans Low end of range | Dec. 31, 2012 Partnership's term loan facility due November 2015 Base rate loans High end of range | Nov. 30, 2010 Partnership's previous senior secured credit facility
Long-term Debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Expiration period of credit facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5 years |  |  |  |  |  |  |  |  |  |  |  |  |  | 5 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revolving credit facility borrowing capacity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 900,000,000 | $ 1,100,000,000 | $ 900,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 550,000,000 |  | $ 550,000,000 | $ 400,000,000 |  |  |  |  |  |  |  |  |  | $ 150,000,000 |  |  |  |  |  |  |  |
Transaction costs |  | 1,011,000 | 8,823,000 | 12,034,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 7,800,000 |  |  |  |  |  |  |  |  |  |  |  |  |  | 4,000,000 | 500,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Write-off of deferred financing costs |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,300,000 | 1,600,000 |  |  |  |  |  |  |  |  |  | 1,400,000 |  | 200,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 387,300,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Decrease in borrowing capacity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 200,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 304,000,000 |  |  |  |  |  |  |  |  |  | 150,000,000 |  |  |  |  |  |  |  |
Outstanding borrowings |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 70,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, variable rate basis |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | LIBOR |  |  | base rate |  |  | Federal Funds Rate | one-month LIBOR |  |  |  |  |  |  |  |  |  |  | LIBOR |  |  | base rate |  |  | Federal Funds Rate | one-month LIBOR |  |  | LIBOR |  |  | base rate |  |  |
Debt instrument, basis spread on variable rate (as a percent) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1.75% | 1.50% | 2.50% |  | 0.50% | 1.50% | 0.50% | 1.00% |  |  |  |  |  |  |  |  |  |  | 2.50% | 2.25% | 3.25% |  | 1.25% | 2.25% | 0.50% | 1.00% |  |  | 2.75% | 2.50% | 3.50% |  | 1.50% | 2.50% |
Weighted average annual interest rate (as a percent) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2.80% |  |  |  |  |  |  |  |  |  | 3.00% |  |  |  |  |  |  |
Outstanding letters of credit |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 183,900,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Undrawn capacity under revolving credit facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 646,100,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 219,500,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Available additional borrowings under revolving credit facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 199,400,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of equity interests in first tier foreign subsidiaries |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 65.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum additional commitment amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 300,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Minimum adjusted EBITDA to total interest expense ratio |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2.25 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum consolidated total debt to adjusted EBITDA ratio |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum senior secured debt to adjusted EBITDA ratio |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repayment of long term debt |  | 2,106,639,000 | 2,036,171,000 | 2,478,397,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 6,000,000 | 30,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 406,100,000
Amount of interest rate swap termination payments | 14,800,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Increase in borrowing capacity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 200,000,000 | 150,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Minimum EBITDA to total interest expense ratio |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Minimum revised EBITDA to total interest expense ratio |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2.75 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum total debt to EBITDA ratio |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4.75 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum revised total debt to EBITDA ratio |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5.25 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principle amount of senior notes |  |  |  |  |  | 350,000,000 |  |  |  |  |  |  |  |  | 355,000,000 |  | 143,750,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate (as a percent) |  |  |  |  | 7.25% | 7.25% |  |  |  |  |  | 4.25% |  |  | 4.25% | 4.75% | 4.75% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum percentage of the aggregate principal amount of debt instruments that may be redeemed prior to December 1, 2013 |  |  |  |  | 35.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Redemption price as percentage of principal amount |  |  |  |  |  |  | 107.25% | 105.438% | 103.625% | 101.813% | 100.00% |  |  |  |  |  |  | 100.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Minimum notes remaining outstanding if notes redeemed prior to December 1, 2013 (as a percent) |  |  |  |  | 65.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum number of days within which the entity may redeem a percentage of the note following the date of the closing of equity offering |  |  |  |  | 120 days |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Initial conversion rate of debt instrument (Shares per USD) |  |  |  |  |  |  |  |  |  |  |  | 0.0431951 |  |  |  | 0.0216667 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Initial conversion price per common stock shares (in dollars per share) |  |  |  |  |  |  |  |  |  |  |  | $ 23.15 |  |  |  | $ 46.15 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest expense related to amortization of debt discount |  | 20,523,000 | 18,323,000 | 16,364,000 |  |  |  |  |  |  |  | 20,500,000 | 18,300,000 | 16,400,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Recognized interest expense related to the contractual interest coupon |  |  |  |  |  |  |  |  |  |  |  | 15,100,000 | 15,100,000 | 15,100,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Effective interest rate (as a percent) |  |  |  |  |  |  |  |  |  |  |  | 11.67% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Price per share of common stock for call options purchased |  |  |  |  |  |  |  |  |  |  |  | $ 23.15 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Warrant Exercise Price |  |  |  |  |  |  |  |  |  |  |  | $ 32.67 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument face amount for effective conversion price |  |  |  |  |  |  |  |  |  |  |  | 325,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Effective conversion price (in dollars per share) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3267.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Minimum percentage of conversion price for common stock price to exceed between January 15, 2011 and January 15, 2013 in order to redeem notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 135.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Minimum number of trading days for the entity's common stock price to exceed specified percentage of conversion price during specified number of days in order to redeem notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 20 days |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of consecutive trading days to be considered to meet trading days minimum requirement for the entity's common stock price to exceed specified percentage of conversion price during specified number of days in order to redeem notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 30 days |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of principal amount at which notes may be required to be repurchased in event of change of control |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 100.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt Maturity Schedule |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
2014 |  | 498,750,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
2015 |  | 680,500,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
2016 |  | 70,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Thereafter |  | 350,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total Long-Term Debt |  | 1,599,250,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount of unamortized discount of notes |  |  |  |  |  |  |  |  |  |  |  | $ 34,300,000 | $ 54,900,000 |  | $ 97,900,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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