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Senior and Convertible Senior Notes (Details Textual) - Senior Notes [Member] - USD ($) | 6 Months Ended |  |
--- | --- | --- | ---
Jun. 30, 2015 | Jun. 02, 2015 | Dec. 31, 2014
4.50% senior notes due 2018 [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Debt Instrument, Interest Rate, Stated Percentage | 4.50% |  | 4.50%
7.15% senior notes due 2020 [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Debt Instrument, Interest Rate, Stated Percentage | 7.15% |  | 7.15%
7.00% senior notes due 2022 [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Debt Instrument, Interest Rate, Stated Percentage | 7.00% |  | 7.00%
6.00% senior notes due 2025 [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Debt instrument, face amount |  | $ 200,000,000 |
Debt Instrument, Interest Rate, Stated Percentage | 6.00% | 6.00% |
1.875% convertible senior notes due 2032 [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Debt Instrument, Interest Rate, Stated Percentage | 1.875% |  | 1.875%
Debt instrument, convertible, conversion ratio | 0.0171985 |  |
Debt instrument, convertible, conversion price (in dollars per share) | $ 58.14 |  |
Conversion premium (percentage) | 47.50% |  |

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