Quarterly report pursuant to Section 13 or 15(d)

Stockholders' Equity Share Repurchase Program (Details)

v2.4.1.9
Stockholders' Equity Share Repurchase Program (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
12 Months Ended
Dec. 31, 2013
Mar. 31, 2015
Dec. 31, 2012
Class of Stock [Line Items]      
Stock Repurchase Program, Number of Shares Authorized to be Repurchased   25,000,000us-gaap_StockRepurchaseProgramNumberOfSharesAuthorizedToBeRepurchased 10,000,000us-gaap_StockRepurchaseProgramNumberOfSharesAuthorizedToBeRepurchased
Stock Repurchase Program, Number of Shares Repurchased to Date   2,450,700two_StockRepurchaseProgramNumberofSharesRepurchasedtoDate  
Stock Repurchase Program, Value of Shares Repurchased to Date   $ 23,894two_StockRepurchaseProgramValueofSharesRepurchasedtoDate  
Stock Repurchase Program, Number of Additional Shares Authorized to be Repurchased 15,000,000two_StockRepurchaseProgramNumberOfAdditionalSharesAuthorizedToBeRepurchased