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Equity - Common Stock Offering Narrative (Details) - USD ($) |  |  |  |  |  |  | 12 Months Ended
--- | --- | --- | --- | --- | --- | --- | ---
Nov. 28, 2016 | Jul. 21, 2016 | May 16, 2016 | Apr. 01, 2015 | Jan. 20, 2015 | Jan. 28, 2014 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |
Proceeds from issuance of common stock, net |  |  |  |  |  |  | $ 1,449,581,000 | $ 380,620,000 | $ 195,869,000
At-the-Market |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |
Proceeds from sale of common stock, net of underwriters' discount (in shares) |  |  |  |  |  |  | 165,000 | 0 | 76,000
Proceeds from issuance of common stock, net |  |  |  |  |  |  | $ 20,100,000 |  |
Maximum shares authorized, value |  |  |  |  |  |  | $ 125,000,000.0 |  |
At-the-Market | Minimum |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |
Share price |  |  |  |  |  |  | $ 33.54 |  | $ 21.92
At-the-Market | Maximum |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |
Share price |  |  |  |  |  |  | $ 33.95 |  | $ 22.07
Common Stock |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |
Proceeds from sale of common stock, net of underwriters' discount (in shares) | 17,533,099 | 19,195,373 | 10,117,223 | 8,626,311 | 12,650,000 | 9,487,500 | 47,010,695 | 12,650,000 | 9,563,500
Share price |  |  |  |  | $ 31.75 | $ 21.50 |  |  |
Proceeds from issuance of common stock, net |  |  |  |  | $ 385,600,000 | $ 195,800,000 |  |  |
Common Stock | Public Offering |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |
Proceeds from sale of common stock, net of underwriters' discount (in shares) |  |  |  |  | 11,000,000 | 8,250,000 |  |  |
Common Stock | Over-Allotment Option |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |
Proceeds from sale of common stock, net of underwriters' discount (in shares) |  |  |  |  | 1,650,000 | 1,237,500 |  |  |

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