Annual report pursuant to Section 13 and 15(d)

Stockholders' Equity Public Offerings (Details)

v2.4.1.9
Stockholders' Equity Public Offerings (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
3 Months Ended 12 Months Ended
Mar. 31, 2014
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Mar. 22, 2013
Class of Stock [Line Items]          
Common Stock, Shares, Issued   366,395,920us-gaap_CommonStockSharesIssued 364,935,168us-gaap_CommonStockSharesIssued   50,000,000us-gaap_CommonStockSharesIssued
Common Stock, Shares, Issued Pursuant to the Underwriters' Over-allotments         7,500,000two_CommonStockSharesIssuedPursuantToUnderwritersOverAllotments
Sale of Stock, Price Per Share         $ 13.46us-gaap_SaleOfStockPricePerShare
Proceeds from Issuance of Common Stock $ 774,000us-gaap_ProceedsFromIssuanceOfCommonStock $ 588us-gaap_ProceedsFromIssuanceOfCommonStock $ 763,557us-gaap_ProceedsFromIssuanceOfCommonStock $ 1,362,747us-gaap_ProceedsFromIssuanceOfCommonStock  
Proceeds from Issuance of Common Stock, Net   762,900two_ProceedsFromIssuanceOfCommonStockNet      
Payments of Stock Issuance Costs $ 11,100us-gaap_PaymentsOfStockIssuanceCosts