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Stock Purchase Plan Stock Purchase Plan (Details) (USD $) | 3 Months Ended | 6 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Sep. 30, 2013 | Jun. 30, 2013 | Jun. 30, 2013 | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011 | Mar. 05, 2013
stock offering |  | 11,100,000 |  |  |  |  |
Share Price | $ 29.50 |  |  |  |  |  | $ 30.29
Equity Forward Sale Agreement, Settlement Threshold | 10,400,000 |  |  |  |  |  |
equity forward sale agreement future settlement amount | $ 288,000,000 |  |  |  |  |  |
Option Indexed to Issuer's Equity, Settlement Alternatives, Cash, at Fair Value |  |  |  | 26,000,000 |  |  |
Net share settlement |  |  |  | 876,318 |  |  |
Common Stock, Discount on Shares | 0.96 |  |  |  |  |  |
Sale of Stock, Price Per Share |  | $ 28.54 | $ 28.54 |  |  |  |
Proceeds from Issuance of Common Stock | 20,000,000 |  | 47,000,000 | 67,000,000 | 0 | 0 |
employee stock purchase plan shares authorized |  |  |  | 625,000 |  |  |
Employee Stock Purchase Plan, Base Pay Threshold |  |  |  | 10.00% |  |  |
Employee Stock Purchase Plan, Purchased Stock Value Limitation |  |  |  | $ 25,000 |  |  |
Employee Stock Purchase Plan, Share Purchase Limitation |  |  |  | 1,500 |  |  |
Employee Stock Purchase Plan, Purchase Price |  |  |  | 95.00% |  |  |
Employee Stock Purchase Plan, Number of Available Shares |  |  |  | 451,506 |  |  |
Dividend Reinvestment and Direct Stock Purchase Plan Shares |  |  |  | 2,500,000 |  |  |
Dividend Reinvestment and Direct Stock Purchase Plan, Number of Available Shares |  |  |  | 2,485,055 |  |  |
Common Stock [Member] |  |  |  |  |  |  |
Stock Issued During Period, Shares, New Issues | 700,000 | 1,665,000 |  | 2,365,000 |  |  |

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- Definition Dividend Reinvestment and Direct Stock Purchase Plan, Number of Available Shares + References No definition available. + Details
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- Definition Funds that would be received undter the equity forward sale agreement in the future. + References No definition available. + Details
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- Definition Discount on common shares, or any unamortized balance thereof, shown separately as a deduction from the applicable account(s) as circumstances require. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187103-122770 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 07 -Article 4 + Details
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