Annual report pursuant to Section 13 and 15(d)

Stockholders' Equity Public Offerings (Details)

v3.3.1.900
Stockholders' Equity Public Offerings (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2013
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Mar. 22, 2013
Class of Stock [Line Items]          
Common Stock, Shares, Issued   353,906,807 366,395,920   50,000,000
Common Stock, Shares, Issued Pursuant to the Underwriters' Over-allotments         7,500,000
Sale of Stock, Price Per Share         $ 13.46
Proceeds from Issuance of Common Stock $ 774,000 $ 539 $ 588 $ 763,557  
Proceeds from Issuance of Common Stock, Net 762,900        
Payments of Stock Issuance Costs $ 11,100