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Debt (Narrative) (Details) (USD $) | 3 Months Ended | 9 Months Ended |  |  | 9 Months Ended |  |  | 9 Months Ended |  |  |  |  | 3 Months Ended |  | 3 Months Ended
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Sep. 30, 2014 | Sep. 30, 2013 | Sep. 30, 2014 | Sep. 30, 2013 | Dec. 31, 2013 | Sep. 30, 2014 Unsecured Letter of Credit [Member] | Sep. 30, 2014 Financial Services [Member] Unsecured Letter of Credit [Member] | Sep. 30, 2014 Letter of Credit [Member] | Dec. 31, 2013 Letter of Credit [Member] | Sep. 30, 2014 Repurchase Agreement [Member] Financial Services [Member] | Sep. 08, 2014 Repurchase Agreement [Member] Financial Services [Member] | Dec. 31, 2013 Repurchase Agreement [Member] Financial Services [Member] | Jun. 01, 2015 Repurchase Agreement [Member] Financial Services [Member] Subsequent Event [Member] | Feb. 02, 2015 Repurchase Agreement [Member] Financial Services [Member] Subsequent Event [Member] | Sep. 30, 2014 Revolving Credit Facility [Member] | Jul. 23, 2014 Revolving Credit Facility [Member] | Jul. 23, 2014 Revolving Credit Facility Accordion Feature [Member] | Jun. 30, 2015 Scenario, Forecast [Member] Repurchase Agreement [Member] Financial Services [Member] | Mar. 31, 2015 Scenario, Forecast [Member] Repurchase Agreement [Member] Financial Services [Member]
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Extinguishment of Debt, Amount | $ 0 | $ 27,000,000 | $ 245,700,000 | $ 461,400,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss on debt retirements | 0 | 3,858,000 | 8,584,000 | 26,930,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Letters of Credit Outstanding, Amount | 205,800,000 |  | 205,800,000 |  | 183,100,000 | 195,500,000 |  | 10,300,000 | 58,700,000 |  |  |  |  |  |  |  |  |  |
Maximum Borrowing Capacity |  |  |  |  |  |  |  |  |  |  | 150,000,000 |  | 150,000,000 | 99,800,000 |  | 500,000,000 | 1,000,000,000 |  |
Line of Credit Facility, Expiration date |  |  |  |  |  |  | Sep. 01, 2014 |  |  | Sep. 07, 2015 |  |  |  |  | Jul. 21, 2017 |  |  |  |
Line of Credit Facility, Initiation Date |  |  |  |  |  |  |  |  |  | Sep. 08, 2014 |  |  |  |  | Jul. 23, 2014 |  |  | Jun. 01, 2015 | Feb. 02, 2015
Line of Credit Facility, Amount Outstanding | $ 71,594,000 |  | $ 71,594,000 |  | $ 105,664,000 |  |  |  |  | $ 71,600,000 |  | $ 105,700,000 |  |  |  |  |  |  |

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- Definition Gross amount of debt extinguished. + References No definition available. + Details
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- Definition Difference between the fair value of payments made and the carrying amount of debt which is extinguished prior to maturity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 50 -Section 40 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6850294&loc=d3e12317-112629 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 50 -Section 40 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6850294&loc=d3e12355-112629 + 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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- 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 Date the credit facility terminates, in CCYY-MM-DD format. + 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 Date the credit facility first became available, in CCYY-MM-DD format. + 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 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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