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Stockholders' Equity - Narrative (Details) (USD $)
In Millions, except Share data, unless otherwise specified
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12 Months Ended |
0 Months Ended |
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Dec. 31, 2014
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Dec. 31, 2013
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May 14, 2014
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Apr. 15, 2014
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May 13, 2014
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May 12, 2014
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Jul. 17, 2013
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| Class of Stock [Line Items] |
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| Stock, shares authorized (in shares) |
770,000,000 |
490,000,000 |
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770,000,000 |
490,000,000 |
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| Common stock, shares authorized (in shares) |
750,000,000 |
470,000,000 |
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| Common stock, par value per share (in dollars per share) |
$ 0.01 |
$ 0.01 |
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$ 0.01 |
| Preferred stock, shares authorized (in shares) |
20,000,000 |
20,000,000 |
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| Preferred stock par value (in dollars per share) |
$ 0.01 |
$ 0.01 |
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| Outstanding shares of preferred stock (in shares) |
0 |
0 |
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| Shares withheld for taxes (in shares) |
300,000 |
200,000 |
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| Shares withheld for taxes, value |
$ 2.9 |
$ 1.9 |
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| Aggregate number of shares sold (in shares) |
411,824,039 |
370,570,565 |
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| Registered Offering [Member] |
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| Class of Stock [Line Items] |
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| Common stock, par value per share (in dollars per share) |
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$ 0.01 |
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| Issuance of common stock (in shares) |
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26,450,000 |
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| Continuous Equity Offering [Member] |
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| Class of Stock [Line Items] |
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| Shares authorized, amount (in shares) |
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350.0 |
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| Aggregate number of shares sold (in shares) |
14,400,000 |
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| Proceeds from sale of stock |
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$ 163.8 |
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