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Senior, Convertible Senior Notes (Details Textual) (USD $) |  |  |  | 9 Months Ended | 12 Months Ended | 9 Months Ended | 12 Months Ended | 9 Months Ended | 12 Months Ended | 9 Months Ended | 12 Months Ended |  | 9 Months Ended |  |
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Sep. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2013 | Sep. 30, 2014 4.50% senior notes due two thousand eighteen [Member] | Dec. 31, 2013 4.50% senior notes due two thousand eighteen [Member] | Sep. 30, 2014 7.00% senior notes due 2022 [Member] | Dec. 31, 2013 7.00% senior notes due 2022 [Member] | Sep. 30, 2014 7.15% senior notes due 2020 [Member] | Dec. 31, 2013 7.15% senior notes due 2020 [Member] | Sep. 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] | Sep. 30, 2014 Revolving Credit Facility [Member] | Dec. 31, 2013 Revolving Credit Facility [Member] | Sep. 30, 2014 Credit Facility Accordion Feature [Member] | Sep. 30, 2014 Consolidated EBITDA [Member] Revolving Credit Facility [Member] | Sep. 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 | $ 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 | 24,286,000 |  | 42,068,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility, Remaining Borrowing Capacity |  |  |  |  |  |  |  |  |  |  |  |  | 375,700,000 |  |  |  |
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 |  |  |  |  |  |  |  | $ 3,128,660 | $ 3,555,000 |  |  |  |  |  |  |  |
Debt Instrument, Convertible, Conversion Ratio |  |  |  |  |  |  |  |  |  | 17.1985 |  |  |  |  |  |  |
Debt Instrument, Convertible, Conversion Price |  |  |  |  |  |  |  |  |  |  |  | $ 58.14 |  |  |  |  |

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- Definition As of any date, for the applicable period of the four quarters then ended, the ratio of (a) Consolidated EBITDA to (b) Consolidated Interest Incurred. + References No definition available. + Details
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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 The price per share of the conversion feature embedded in the debt instrument. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 5 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6928298&loc=SL6031898-161870 + Details
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- Definition The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.16) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 20, 22 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.16) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: 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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- Definition Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: 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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