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Equity (Details 2) - USD ($) |  | 1 Months Ended | 3 Months Ended | 6 Months Ended |
--- | --- | --- | --- | --- | ---
Sep. 09, 2014 | Aug. 31, 2012 | Jun. 30, 2015 | Jun. 30, 2015 | Jun. 30, 2014 | Dec. 31, 2014
Class of Stock [Line Items] |  |  |  |  |  |
Common stock, shares authorized |  |  | 280,000,000 | 280,000,000 |  | 280,000,000
Preferred stock, shares authorized |  |  | 50,000,000 | 50,000,000 |  | 50,000,000
Common stock shares issued in connection with stock options exercised |  |  |  | 54,196 |  |
Common stock issued through the dividend reinvestment plan (in shares) |  |  |  | 1,028 | 1,286 |
Stock issued in connection with stock grants (in shares) |  |  |  | 157,779 | 113,822 |
Number of shares of stock grants withheld |  |  |  | 36,104 | 50,105 |
Stock Issued During Period, Shares, Employee Stock Purchase Plans |  |  |  | 5,022 |  |
Issuance of common stock |  |  |  | $ 97,326,000 | $ 214,970,000 |
Share Price | $ 155.83 |  |  |  |  |
Forward Contract Indexed to Issuer's Equity, Shares | 4,500,000 |  |  | 609,275 |  |
Forward Contract Indexed to Issuer's Equity, Forward Rate Per Share | $ 151.74 |  | $ 147.72 |  |  |
CEP III |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Common stock shares issued |  |  | 0 | 0 |  |
Maximum value of shares of common stock that can be sold (in dollars) |  | $ 750,000,000 |  |  |  |
Period during which common stock can be sold |  | 36 months |  |  |  |
Percentage of compensation received by sales agent |  |  |  | 1.50% |  |
Value of additional shares authorized for issuance |  |  | $ 346,304,000 | $ 346,304,000 |  |
Forward Equity Contract [Member] |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Issuance of common stock |  |  | $ 90,000,000 |  |  |
Non Employee Director [Member] | Deferred Compensation, Share-based Payments [Member] |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Conversion of Shares |  |  |  | 46,589 |  |

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