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Commitments and Contingencies - Litigation relating to Merger (Details) (Class Action Lawsuits Relating To Merger, USD $)
In Millions, except Per Share data, unless otherwise specified
6 Months Ended
Jun. 30, 2014
officers
Class Action Lawsuits Relating To Merger
 
Loss Contingencies [Line Items]  
Loss Contingency, Number of Defendants 2
Number of shares held by shareholders who sent notices to exercise rights as per Merger Agreement 3.1
Litigation Required Notice Period 120
Cash per share price (in dollars per share) $ 2.20