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Stockholders' Equity (Details 2) - Collared Accelerated Repurchase Program - USD ($)
$ in Millions
Jul. 27, 2015
Feb. 27, 2015
Share Repurchase Program    
Common stock repurchase authorized amount   $ 75
Minimum    
Share Repurchase Program    
Number of shares authorized to be repurchased   1,500,000
Subsequent event    
Share Repurchase Program    
Additional Shares Delivered Under Share Repurchase Program 0