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Stockholders' Equity (Narrative) (Details) - USD ($) $ / shares in Units, $ in Thousands | 1 Months Ended | 3 Months Ended | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Mar. 31, 2015 | Jun. 30, 2014 | Mar. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2012 | Jan. 31, 2017 | Dec. 31, 2016 | Jan. 25, 2016 | Jun. 18, 2015
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Sales per share price range |  |  |  |  |  |  |  |  | $ 5.56 |
Proceeds from shares sold |  |  |  | $ 204,275 | $ 107,895 |  |  |  |  |
Common Stock, Shares Authorized |  |  |  | 600,000,000 |  |  |  | 600,000,000 |  |
Shelf Registration Statement, Maximum Authorized Stock Issuance, Value |  |  |  |  |  |  |  | $ 200,000 |  |
Convertible Debt [Member] |  |  |  |  |  |  |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Adjustments to Additional Paid IN capital, Cost and Expenses on Derivative Transaction |  |  | $ 38,500 |  |  |  |  |  |  |
Subsequent Event [Member] |  |  |  |  |  |  |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Shelf Registration Statement, Maximum Authorized Common Stock Issuance, Value |  |  |  |  |  |  | $ 75,000 |  |  |
Public Offering [Member] |  |  |  |  |  |  |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Sales per share price range | $ 7.25 | $ 4.00 |  |  |  |  |  |  |  |
Shares sold | 27,758,620 | 28,750,000 |  |  |  |  |  |  |  |
Common stock issued upon exercise in full over-allotment granted | 3,620,689 | 3,750,000 |  |  |  |  |  |  |  |
Proceeds from shares sold | $ 190,000 | $ 108,000 |  |  |  |  |  |  |  |
Offering costs | $ 11,600 | $ 7,100 |  |  |  |  |  |  |  |
Shelf Registration Statement, Maximum Authorized Stock Issuance, Value |  |  |  |  |  |  |  | $ 125,000 |  |
2012 Sales Agreement [Member] |  |  |  |  |  |  |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Sales per share price range |  |  |  | $ 10.63 |  |  |  |  |  |
Shares sold |  |  |  | 1,400,000 |  |  |  |  |  |
Proceeds from shares sold |  |  |  | $ 14,600 |  |  |  |  |  |
Minimum [Member] |  |  |  |  |  |  |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Common Stock, Shares Authorized |  |  |  |  |  |  |  |  |  | 300,000,000
Maximum [Member] |  |  |  |  |  |  |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Common Stock, Shares Authorized |  |  |  |  |  |  |  |  |  | 600,000,000
Maximum [Member] | 2012 Sales Agreement [Member] |  |  |  |  |  |  |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Common stock authorized for issuance under prior shelf registration statement with SEC, dollar amount |  |  |  |  |  | $ 50,000 |  |  |  |

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