Financing Activities (Distributions and Capital Contributions) (Details) (USD $)
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1 Months Ended | 3 Months Ended | 6 Months Ended | ||
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May 31, 2014
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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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Distributions [Line Items] | |||||
Quarterly common stock dividend declaration date | 2014-05 | ||||
Dividend payable date of quarterly common stock dividend | Jul. 01, 2014 | ||||
Current quarterly common stock dividend (in dollars per share) | $ 0.3725 | $ 0.3725 | $ 0.3675 | $ 0.7450 | $ 0.7350 |
Annualized current quarterly common stock dividend (in dollars per share) | $ 1.49 |