Subsequent Event (Details) - Jul. 23, 2015 - Subsequent Event [Member] - USD ($) $ / shares in Units, $ in Millions	Total
Subsequent Event [Line Items]
Cash consideration for each share of Company stock	$ 103.40
Shares of acquirer common stock for each share of Company stock	0.5152
Termination fee payable to Company under certain circumstances	$ 1,850
Termination fee payable to acquirer under certain circumstances	1,850
Reverse termination fee payable to Company	1,850
Termination fee payable to Company if acquirer shareholders fail to approve	600
Termination fee payable to acquirer if Company shareholders fail to approve	$ 600