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Commitments and Contingencies (Details) (USD $) |  |  |  |  | 9 Months Ended |  | 9 Months Ended
--- | --- | --- | --- | --- | --- | --- | ---
Sep. 30, 2014 | Dec. 31, 2013 | Sep. 30, 2014 Unsecured Debt [Member] Revolving Credit Facility [Member] | Sep. 30, 2013 Unsecured Debt [Member] Revolving Credit Facility [Member] | Sep. 30, 2014 Unsecured Debt [Member] Revolving Credit Facility [Member] Average Quarterly Utilization of Facility is Less than 20% [Member] | Sep. 30, 2014 Unsecured Debt [Member] Revolving Credit Facility [Member] Average Quarterly Utilization of Facility is 20% or More [Member] | Sep. 30, 2014 Unsecured Debt [Member] Revolving Credit Facility [Member] One-Month London Interbank Offer Rate, Reset Daily [Member] | Sep. 30, 2014 Unsecured Debt [Member] Revolving Credit Facility [Member] One-Month, Two-Month, Three-Month, Six-Month, or Twelve-Month London Interbank Offer Rate [Member] | Sep. 30, 2014 Unsecured Debt [Member] Revolving Credit Facility [Member] Letter of Credit Subfacility [Member] | Sep. 30, 2013 Unsecured Debt [Member] Revolving Credit Facility [Member] Letter of Credit Subfacility [Member] | Sep. 30, 2014 Unsecured Debt [Member] Revolving Credit Facility [Member] Swing Line Loan [Member] One-Month London Interbank Offer Rate, Reset Daily [Member]
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revolving credit facility, maximum borrowing capacity |  |  | $ 230,000,000 |  |  |  |  |  | $ 40,000,000 |  |
Face amount of outstanding undrawn letters of credit |  |  |  |  |  |  |  |  | 34,360,000 | 29,250,000 |
Line of credit, amount outstanding | $ 105,000,000 | $ 0 | $ 105,000,000 | $ 0 |  |  |  |  |  |  |
Interest percentage over LIBOR rate |  |  |  |  |  |  | 0.875% | 0.875% |  |  | 0.875%
Percentage fee paid for unused portion of revolving credit facility |  |  |  |  | 0.125% | 0.10% |  |  | 0.875% |  |
Revolving credit facility, issuance fee as percent of face amount |  |  |  |  |  |  |  |  | 0.075% |  |

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- Definition Line of Credit Facility, Issuance Fee as Percent of Face Amount + References No definition available. + Details
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- Definition Percentage points added to the reference rate to compute the variable rate on the debt instrument. + References No definition available. + Details
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- Definition The total amount of the contingent obligation under letters of credit outstanding as of the reporting date. + References No definition available. + 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 The fee, expressed as a percentage of the line of credit facility, for available but unused credit capacity under the credit facility. + References No definition available. + Details
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- Definition The carrying value as of the balance sheet date of the current portion 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 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.20) -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, 20 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Line-of-Credit Arrangement -URI http://asc.fasb.org/extlink&oid=6517033 + Details
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