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Senior, Senior Subordinated, Convertible Senior Notes (Details Textual) (USD $) | 3 Months Ended | 9 Months Ended |  |  |  |  |  |  |  |  |  |  | 3 Months Ended | 9 Months Ended | 3 Months Ended |  |  |  |  |
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Sep. 30, 2012 | Sep. 30, 2011 | Sep. 30, 2012 | Sep. 30, 2011 | Sep. 30, 2012 6.25% senior notes due 2015 [Member] | Apr. 30, 2012 6.25% senior notes due 2015 [Member] | Dec. 31, 2011 6.25% senior notes due 2015 [Member] | Sep. 30, 2012 7.731% senior subordinated notes due 2017 [Member] | Apr. 30, 2012 7.731% senior subordinated notes due 2017 [Member] | Dec. 31, 2011 7.731% senior subordinated notes due 2017 [Member] | Sep. 30, 2012 7.00% senior notes due 2022 [Member] | Apr. 30, 2012 7.00% senior notes due 2022 [Member] | Sep. 30, 2012 7.15% senior notes due 2020 [Member] | Dec. 31, 2011 7.15% senior notes due 2020 [Member] | Sep. 30, 2012 1.875% convertible senior notes due 2032 [Member] | Sep. 30, 2012 1.875% convertible senior notes due 2032 [Member] | Sep. 30, 2012 Revolving Credit Facility [Member] | Dec. 31, 2011 Revolving Credit Facility [Member] | Jan. 01, 2013 Consolidated EBITDA [Member] Revolving Credit Facility [Member] | Sep. 30, 2012 Consolidated EBITDA [Member] Revolving Credit Facility [Member] | Jan. 01, 2013 Consolidated Interest Incurred [Member] Revolving Credit Facility [Member] | Sep. 30, 2012 Consolidated Interest Incurred [Member] Revolving Credit Facility [Member]
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of credit facility, maximum borrowing capacity | $ 40,000,000 |  | $ 40,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 125,000,000 |  |  |  |  |
Available for issuance |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 50,000,000 |  |  |  |  |
Line of credit facility, expiration date |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | Jul. 24, 2015 |  |  |  |  |
Minimum net worth required for compliance |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 360,000,000 |  |  |  |  |
Leverage ratio |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 60.00% |  |  |  |  |
Interest coverage ratio |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1.50 | 1 | 1 | 1
Line of credit facility, amount outstanding |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 |  |  |  |
Debt instrument, stated rate |  |  |  |  | 6.25% |  | 6.25% | 7.731% |  | 7.731% | 7.00% |  | 7.15% | 7.15% | 1.875% | 1.875% |  |  |  |  |  |
Percentage of wholly owned subsidiary | 100.00% |  | 100.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Senior notes unamortized discount |  |  |  |  |  |  | 451,000 |  |  |  |  |  | 3,650,000 | 4,015,000 |  |  |  |  |  |  |  |
Year in which senior and senior subordinated notes due |  |  |  |  | 2015 |  | 2015 | 2017 |  | 2017 | 2022 |  | 2020 | 2020 | 2032 | 2032 |  |  |  |  |  |
Aggregate principal amount of offering |  |  |  |  |  |  |  |  |  |  |  | 300,000,000 |  |  | 126,500,000 | 126,500,000 |  |  |  |  |  |
Aggregate principal amount repurchased |  |  |  |  |  | 285,000,000 |  |  | 26,100,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, convertible, conversion ratio |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 17.1985 |  |  |  |  |  |  |
Conversion principal amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,000 |  |  |  |  |  |
Debt instrument, convertible, conversion price |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 58.14 | $ 58.14 |  |  |  |  |  |
Senior and Senior Subordinated Notes (Textual) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss on extinguishment of debt | $ 0 | $ 0 | $ (5,772,000) | $ 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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