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Stockholders' Equity - Restricted Stock Outstanding Rollforward (Details) - Restricted stock - $ / shares
shares in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Number of Shares      
Outstanding at December 31, 2014, nonvested (in shares) 427    
Granted (in shares) 203 265 266
Vested (in shares) (171)    
Forfeited (in shares) (2)    
Outstanding at December 31, 2015, nonvested (in shares) 458 427  
Weighted- average grant date fair value      
Outstanding at December 31, 2014, nonvested (in dollars per share) $ 13.67    
Granted (in dollars per share) 12.43 $ 13.57 $ 13.61
Vested (in dollars per share) 13.44    
Forfeited (in dollars per share) 10.68    
Outstanding at December 31, 2015, nonvested (in dollars per share) $ 13.22 $ 13.67