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Long-Term Debt (Details) (USD $) | 12 Months Ended
--- | ---
Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2009
Debt Instrument [Line Items] |  |  |
Current Portion | $ 69,906,000 | $ 93,342,000 |
Long Term Debt | 1,015,110,000 | 1,247,703,000 |
Effective interest rate beginning January 15, 2009 (in hundredths) | 7.00% |  |
Subordinated Convertible Notes |  |  |
Original issue discount (in hundredths) | 60.498% |  |
Subordinated convertible note holding period for contingent cash interest | six month |  |
Trading days the average price of subordinated convertible note must meet threshold within six months measurement period | five |  |
Subordinated convertible note average trading price threshold of the sum of issue price accrued issue discount and accrued cash interest in the measurement period preceding applicable six month period | 12000.00% |  |
Commencement date for measurement of average trading price on a subordinated convertible note | January 15, 2009 |  |
Contingent cash interest payable annual rate if threshold is met (in hundredths) | 0.25% |  |
Convertible notes purchase price on January 15, 2014 | 475.66 |  |
Next conversion date | January 15, 2014 |  |
Convertible notes purchase price on January 15, 2019 (third conversion date) | 572.76 |  |
Third conversion date | January 15, 2019 |  |
Convertible notes purchase price on January 15, 2024 (fourth conversion date) | 689.68 |  |
Fourth conversion date | January 15, 2024 |  |
Convertible notes purchase price on January 15, 2029 (fifth conversion date) | 830.47 |  |
Fifth conversion date | January 15, 2029 |  |
Date convertible notes became convertible as a result of stock trading above the trigger price during the required consecutive trading days | October 1, 2005 |  |
Minimum number of trading days in the consecutive trading period that the common stock sale price above threshold to trigger conversion (in days) | 20 |  |
Number of consecutive trading days in the preceding quarter the minimum trading days must occur in for the sale price to reach threshold to trigger conversion (in days) | 30 |  |
Decrease in long term debt (debt discount) at December 9, 2004 resulting from the retrospective adoption of accounting guidance regarding convertible debt instruments | 26,500,000 |  |
Increase in deferred tax liabilities at December 9, 2004 resulting from the retrospective adoption of accounting guidance regarding convertible debt instruments | 9,300,000 |  |
Increase in additional paid in capital at December 9, 2004 resulting from the retrospective adoption of accounting guidance regarding convertible debt instruments | 17,300,000 |  |
Effective interest rate used to amortize the debt discount (in hundredths) | 7.00% |  |
Conversion price, end of period | 440.92 |  |
If converted, the value exceeding principal amount outstanding at end of period | 100,000,000 |  |
If converted, issuance of common stock shares | 1,144,214 |  |
Debt covenant, consolidated total leverage ratio | 3.5 |  |
Debt covenant compliance | The Company was in compliance with its debt covenants throughout the years ended December 31, 2011 and 2010. |  |
Outstanding letters of credit | 50,000,000 |  |
Subordinated convertible notes, original public offering amount | 230,000,000 |  |
Convertible notes interest expense [Abstract] |  |  |
Amortization of debt discount |  |  | 301,000
Contractual (stated) interest | 2,750,000 | 3,812,000 | 5,209,000
Interest expense | 2,750,000 | 3,812,000 | 5,510,000
Future maturities of long term debt [Abstract] |  |  |
2011 | 69,906,000 |  |
2012 | 513,031,000 |  |
2013 | 788,000 |  |
2014 | 556,000 |  |
2015 | 493,000 |  |
Thereafter | 500,242,000 |  |
Term Loan [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Amount of term loan paid off with proceeds from senior unsecured notes due September 2019 |  |  | 350,000,000
Non-cash early debt extinguishment charge related to unamortized loan fees |  |  | 400,000
Revolving Credit Facility [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Amount of term loan paid off with proceeds from senior unsecured notes due September 2019 |  |  | 350,000,000
Revolving credit facility term | 5 |  |
Additional borrowings available | 350,000,000 |  |
Senior Notes 2013 [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Issuance Date | August 6, 2008 |  |
Interest rate (in hundredths) | 6.625% |  |
Periodic interest payments, start | February 15, 2009 |  |
Periodic interest payments, end | August 15 |  |
Senior Notes 2019 [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Issuance Date | September 2009 |  |
Interest rate (in hundredths) | 6.25% |  |
Periodic interest payments, start | March 1 2010 |  |
Periodic interest payments, end | September 2019 |  |
Convertible Subordinated Debt [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Current Portion | $ 67,000,000 |  |
Issuance Date | December 2003 |  |
Interest rate (in hundredths) | 3.75% |  |

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