Debt (Narrative) (Details) (USD $)
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3 Months Ended | 6 Months Ended | 6 Months Ended | 6 Months Ended | 3 Months Ended | ||||||||||
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Jun. 30, 2014
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Jun. 30, 2013
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Jun. 30, 2014
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Jun. 30, 2013
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Dec. 31, 2013
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Jun. 30, 2014
Unsecured Letter of Credit [Member]
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Dec. 31, 2013
Unsecured Letter of Credit [Member]
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Jun. 30, 2014
Financial Services [Member]
Unsecured Letter of Credit [Member]
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Jun. 30, 2014
Letter of Credit [Member]
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Dec. 31, 2013
Letter of Credit [Member]
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Jun. 30, 2014
Repurchase Agreement [Member]
Financial Services [Member]
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Dec. 31, 2013
Repurchase Agreement [Member]
Financial Services [Member]
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Jun. 30, 2014
Revolving Credit Facility [Member]
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Jul. 23, 2014
Revolving Credit Facility [Member]
Subsequent Event [Member]
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Jul. 23, 2014
Revolving Credit Facility Accordion Feature [Member]
Subsequent Event [Member]
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Debt Instrument [Line Items] | |||||||||||||||
Extinguishment of Debt, Amount | $ 0 | $ 434,400,000 | $ 245,700,000 | $ 434,400,000 | |||||||||||
Loss on debt retirements | 0 | 23,072,000 | 8,584,000 | 23,072,000 | |||||||||||
Letters of Credit Outstanding, Amount | 194,100,000 | 194,100,000 | 183,100,000 | 107,200,000 | 124,400,000 | 86,900,000 | 58,700,000 | ||||||||
Maximum Borrowing Capacity | 150,000,000 | 99,800,000 | 150,000,000 | 500,000,000 | 1,000,000,000 | ||||||||||
Line of Credit Facility, Expiration date | Sep. 01, 2014 | Sep. 12, 2014 | Jul. 21, 2017 | ||||||||||||
Line of Credit Facility, Initiation Date | Jan. 09, 2014 | Jul. 23, 2014 | |||||||||||||
Line of Credit Facility, Amount Outstanding | $ 58,506,000 | $ 58,506,000 | $ 105,664,000 | $ 58,500,000 | $ 105,700,000 |