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Senior, Convertible Senior Notes (Details Textual) (USD $) |  |  |  | 6 Months Ended | 12 Months Ended | 6 Months Ended | 12 Months Ended | 6 Months Ended | 12 Months Ended | 6 Months Ended | 12 Months Ended |  | 6 Months Ended |  |
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Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2013 | Jun. 30, 2014 4.50% senior notes due two thousand eighteen [Member] | Dec. 31, 2013 4.50% senior notes due two thousand eighteen [Member] | Jun. 30, 2014 7.00% senior notes due 2022 [Member] | Dec. 31, 2013 7.00% senior notes due 2022 [Member] | Jun. 30, 2014 7.15% senior notes due 2020 [Member] | Dec. 31, 2013 7.15% senior notes due 2020 [Member] | Jun. 30, 2014 1.875% convertible senior notes due 2032 [Member] | Dec. 31, 2013 1.875% convertible senior notes due 2032 [Member] | Dec. 31, 2012 1.875% convertible senior notes due 2032 [Member] | Jun. 30, 2014 Revolving Credit Facility [Member] | Dec. 31, 2013 Revolving Credit Facility [Member] | Jun. 30, 2014 Credit Facility Accordion Feature [Member] | Jun. 30, 2014 Consolidated EBITDA [Member] Revolving Credit Facility [Member] | Jun. 30, 2014 Consolidated Interest Incurred [Member] Revolving Credit Facility [Member]
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of credit facility, maximum borrowing capacity | $ 400,000,000 | $ 200,000,000 |  |  |  |  |  |  |  |  |  |  |  |  | $ 100,000,000 |  |
Debt Instrument Maturity Year |  |  |  |  |  |  |  |  |  |  |  |  | 2018 |  |  |  |
Available For Issuance |  |  |  |  |  |  |  |  |  |  |  |  | 200,000,000 |  |  |  |
Minimum net worth required for compliance |  |  |  |  |  |  |  |  |  |  |  |  | 670,300,000 |  |  |  |
Leverage ratio |  |  |  |  |  |  |  |  |  |  |  |  | 60.00% |  |  |  |
Interest coverage ratio |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1.50 | 1.00
Line of credit facility, amount outstanding | 0 |  | 0 |  |  |  |  |  |  |  |  |  | 0 | 0 |  |  |
Letters of Credit Outstanding, Amount | 26,743,000 |  | 42,068,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility, Remaining Borrowing Capacity |  |  |  |  |  |  |  |  |  |  |  |  | 373,300,000 |  |  |  |
Debt instrument, stated rate |  |  |  | 4.50% | 4.50% | 7.00% | 7.00% | 7.15% | 7.15% | 1.875% | 1.875% |  |  |  |  |  |
Percentage of wholly owned subsidiary | 100.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Year in which senior notes due |  |  |  | 2018 | 2018 | 2022 | 2022 | 2020 | 2020 | 2032 | 2032 |  |  |  |  |  |
Aggregate principal amount of offering |  |  |  |  |  |  |  |  |  | 1,000 |  |  |  |  |  |  |
Debt Instrument, Unamortized Premium |  |  |  |  |  |  |  | $ 3,271,000 | $ 3,555,000 |  |  |  |  |  |  |  |
Debt Instrument, Convertible, Conversion Ratio |  |  |  |  |  |  |  |  |  | 17.1985 |  |  |  |  |  |  |
Debt Instrument, Convertible, Conversion Price |  |  |  |  |  |  |  |  |  |  |  | $ 58.14 |  |  |  |  |

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