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Equity - Common Stock Offering Narrative (Details) - USD ($) |  |  |  |  | 12 Months Ended
--- | --- | --- | --- | --- | ---
Apr. 10, 2015 | Apr. 01, 2015 | Jan. 20, 2015 | Feb. 12, 2013 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Class of Stock [Line Items] |  |  |  |  |  |  |
Shares of stock sold (in shares) | 6,037,500 |  | 11,000,000 |  |  |  |
Share price |  |  | $ 31.75 |  |  |  |
Proceeds from issuance of common stock |  |  | $ 385,600,000 |  | $ 385,589,000 | $ 197,468,000 | $ 202,542,000
Shares sold under program to date |  |  |  |  | 14,500,000 |  |
Minimum |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Share price |  |  |  |  |  | $ 21.92 | $ 20.55
Maximum |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Share price |  |  |  |  |  | $ 22.07 | $ 22.27
At-the-Market |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Shares of stock sold (in shares) |  |  |  |  |  | 76,000 | 612,644
Maximum shares authorized, value |  |  |  |  |  | $ 125,000,000.0 |
Common Stock |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Shares of stock sold (in shares) |  |  |  |  | 12,650,000 | 9,563,500 | 9,812,644
Proceeds from issuance of common stock |  |  |  | $ 189,900,000 |  |  |
Public Offering | Common Stock |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Shares of stock sold (in shares) |  |  |  | 8,000,000 |  |  |
Exercise of Over-allotment Option |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Shares of stock sold (in shares) |  |  | 1,650,000 |  |  |  |
Exercise of Over-allotment Option | Common Stock |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Shares of stock sold (in shares) |  |  |  | 1,200,000 |  |  |
Public offering price (dollars per share) |  |  |  | $ 21.50 |  |  |
EOP Northern California Portfolio |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Shares issued as consideration for business combination |  | 63,474,791 |  |  |  |  |
EOP Northern California Portfolio | Common Stock |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Shares issued as consideration for business combination |  | 8,626,311 |  |  |  |  |

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