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Commitments and Contingencies - Letters of credit (Details) (USD $) |  |  |  |  | 9 Months Ended |  |  | 9 Months Ended
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Sep. 30, 2014 | Sep. 30, 2014 Letter of Credit | Dec. 31, 2013 Letter of Credit | Sep. 30, 2014 Letter of Credit Restricted cash and cash equivalents | Dec. 31, 2013 Letter of Credit Restricted cash and cash equivalents | Sep. 30, 2014 Letter of Credit BNP Paribas | Sep. 30, 2014 Letter of Credit Citibank | Jul. 09, 2014 Letter of Credit Citibank | Jul. 08, 2014 Letter of Credit Citibank | Sep. 30, 2014 Letter of Credit J.P. Morgan
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |
Facility |  | $ 400,000,000 |  |  |  | $ 100,000,000 | $ 250,000,000 | $ 250,000,000 | $ 150,000,000 | $ 50,000,000
Notice period (Unused Facility Portion) |  |  |  |  |  | 60 days | 90 days |  |  | 60 days
Letters of credit outstanding |  | 160,100,000 | 127,300,000 |  |  |  |  |  |  |
Letters of credit outstanding as percentage of total facility |  | 40.00% | 42.40% |  |  |  |  |  |  |
Cash and cash equivalents pledged as security |  |  |  | 160,600,000 | 100,600,000 |  |  |  |  |
Unfunded capital commitment | $ 5,500,000 |  |  |  |  |  |  |  |  |

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- Definition Line of Credit Facility, Amount Outstanding, As A Percentage of Maximum Borrowing Capacity + References No definition available. + Details
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- Definition Termination Notice Period For Line of Credit Facilities + References No definition available. + 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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- 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 Minimum amount of other commitment not otherwise specified in the taxonomy. Excludes commitments explicitly modeled in the taxonomy, including but not limited to, long-term and short-term purchase commitments, recorded and unrecorded purchase obligations, supply commitments, registration payment arrangements, leases, debt, product warranties, guarantees, environmental remediation obligations, and pensions. + References No definition available. + Details
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- Definition The carrying amount as of the date of the latest financial statement presented of securities which are owned but transferred to serve as collateral for letter of credit arrangements, and for which the transferee does not have the right by contract or custom to sell or re-pledge them to an unrelated party. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 30 -Section 50 -Paragraph 1A -Subparagraph (b)(1)(i) -URI http://asc.fasb.org/extlink&oid=7523297&loc=SL6224234-111729 + Details
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