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Senior, Convertible Senior Notes (Details Textual) (USD $) | Mar. 31, 2014 | Dec. 31, 2013
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Debt Instrument [Line Items] |  |
Line of credit facility, maximum borrowing capacity | $ 200,000,000 | $ 200,000,000
Line of credit facility, amount outstanding | 0 | 0
Letters of Credit Outstanding, Amount | 35,598,000 | 42,068,000
Percentage of wholly owned subsidiary | 100.00% |
4.50% senior notes due two thousand eighteen [Member] |  |
Debt Instrument [Line Items] |  |
Debt instrument, stated rate | 4.50% | 4.50%
Year in which senior notes due | 2018 | 2018
7.00% senior notes due 2022 [Member] |  |
Debt Instrument [Line Items] |  |
Debt instrument, stated rate | 7.00% | 7.00%
Year in which senior notes due | 2022 | 2022
7.15% senior notes due 2020 [Member] |  |
Debt Instrument [Line Items] |  |
Debt instrument, stated rate | 7.15% | 7.15%
Year in which senior notes due | 2020 | 2020
Debt Instrument, Unamortized Premium | 3,413,000 | 3,555,000
1.875% convertible senior notes due 2032 [Member] |  |
Debt Instrument [Line Items] |  |
Debt instrument, stated rate | 1.875% | 1.875%
Year in which senior notes due | 2032 | 2032
Revolving Credit Facility [Member] |  |
Debt Instrument [Line Items] |  |
Minimum net worth required for compliance | 360,000,000 |
Leverage ratio | 60.00% |
Line of credit facility, amount outstanding | 0 | 0
Line of Credit Facility, Remaining Borrowing Capacity | $ 164,400,000 |
Consolidated EBITDA [Member] | Revolving Credit Facility [Member] |  |
Debt Instrument [Line Items] |  |
Interest coverage ratio | 1.50 |
Consolidated Interest Incurred [Member] | Revolving Credit Facility [Member] |  |
Debt Instrument [Line Items] |  |
Interest coverage ratio | 1.00 |

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- Definition The ratio of (a) Consolidated Debt plus Additional Available Liquidity minus, Unrestricted Cash, to the extent Unrestricted Cash exceeds the Required Liquity, divided by (b) Consolidated Debt plus Consolidated Tangible Net Worth plus Additional Available Liquidity. + References No definition available. + Details
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- Definition Contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition The amount of debt premium that was originally recognized at the issuance of the instrument that has yet to be amortized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 1A -URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28541-108399 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6584090&loc=d3e28878-108400 + Details
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- Definition Amount borrowed under the credit facility as of the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 + Details
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