Annual report pursuant to Section 13 and 15(d)

Stock-Based Compensation (Details 5)

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Stock-Based Compensation (Details 5) (Restricted Stock, USD $)
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Number of Shares      
Balance at the beginning of the period (in shares) 758,990 73,820  
Granted (in shares) 386,245 714,934 77,224
Vested (in shares) (74,298) (24,568)  
Expired/cancelled (in shares)   (1,064)  
Forfeited (in shares) (169,386) (4,132) (3,404)
Balance at the end of the period (in shares) 901,551 758,990 73,820
Weighted-Average Grant Date Fair Value per Share      
Balance at the beginning of the period (in dollars per share) $ 12.49 $ 12.37  
Granted (in dollars per share) $ 19.54 $ 12.50 $ 12.38
Expired/cancelled (in dollars per share)   $ 12.45  
Forfeited (in dollars per share) $ 12.69 $ 12.49 $ 12.55
Balance at the end of the period (in dollars per share) $ 16.50 $ 12.49 $ 12.37
2010 Plan
      
Stock-Based compensation      
Award vesting rights proportion (as a percent) 33.00%    
Number of vesting rights anniversaries 3