Annual report pursuant to Section 13 and 15(d)

Stockholders' Equity and Stock Based Compensation - Nonvested (Details)

v3.8.0.1
Stockholders' Equity and Stock Based Compensation - Nonvested (Details) - USD ($)
$ / shares in Units, $ in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
General and Administrative Expense      
Weighted Average Grant Date Fair Value      
Share-based compensation cost $ 1.5 $ 1.7 $ 1.2
Restricted stock      
Shares      
Granted (in shares) 87,076 171,252  
Forfeited (in shares) (22,694) (7,167)  
2006 Plan and 2012 Plan | Restricted stock      
Shares      
Nonvested shares at the beginning of the period 186,081 123,329  
Granted (in shares) 87,076 171,252  
Vested (in shares) (88,645) (101,333)  
Forfeited (in shares) (22,694) (7,167)  
Nonvested shares at the end of the period 161,818 186,081 123,329
Weighted Average Grant Date Fair Value      
Nonvested shares at the beginning of period (in dollars per share) $ 15.58 $ 16.34  
Granted (in dollars per share) 18.25 17.03  
Vested (in dollars per share) 15.23 14.57  
Forfeited (in dollars per share) 15.50 15.98  
Nonvested shares at the end of period (in dollars per share) $ 15.98 $ 15.58 $ 16.34
Unrecognized compensation cost (in dollars) $ 2.6    
Weighted average period for recognition of unrecognized compensation cost 3 years 1 month 6 days