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Stockholders' Equity - Share Repurchases (Details) - USD ($)
$ / shares in Units, $ in Millions
1 Months Ended 2 Months Ended 12 Months Ended
Nov. 20, 2012
Dec. 31, 2013
Feb. 18, 2016
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Common Stock            
Shareholders' Equity            
Shares sold back           340,334
Accelerated Share Repurchase program 2012            
Shareholders' Equity            
Purchase price of stock repurchased recorded as a reduction in stockholder's equity $ 50.0          
Shares repurchased 3,276,002          
Average purchase price (in dollars per share) $ 15.26          
Increase to diluted shares outstanding to reflect shares sold back           340,334
Accelerated Share Repurchase program 2012 | Private placement            
Shareholders' Equity            
Shares sold back           340,334
Share repurchase program December 2013            
Shareholders' Equity            
Total purchases authorized under share repurchase program   $ 150.0       $ 150.0
Shares repurchased   146,800 518,576 2,002,444 1,930,841  
Average purchase price (in dollars per share)   $ 20.37 $ 15.81 $ 17.45 $ 20.57  
Amount of remaining authorization to repurchase common stock     $ 64.1