Annual report pursuant to Section 13 and 15(d)

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

v3.3.1.900
Stockholders' Equity and Stock Based Compensation - Nonvested Restricted Stock (Details) - USD ($)
$ / shares in Units, $ in Millions
 1 Months Ended 12 Months Ended
Aug. 31, 2006
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Dec. 31, 2008
Dec. 31, 2007
Weighted Average Grant Date Fair Value                    
Share-based compensation cost (in dollars)   $ 1,338.0 $ 1,127.0 $ 1.1            
2006 Plan | Restricted stock                    
Shares                    
Nonvested shares at the beginning of the period     199,550 251,150            
Granted (in shares) 315,000     56,500 92,000 15,000 150,500 140,000 57,500 30,000
Vested (in shares)       (107,325)            
Forfeited (in shares)       (775) (3,525) (8,375) (5,875)   (3,500) (12,500)
Nonvested shares at the end of the period       199,550 251,150          
Weighted Average Grant Date Fair Value                    
Nonvested shares at the beginning of period (in dollars per share)     $ 12.02 $ 11.24            
Granted (in dollars per share)       12.57            
Vested (in dollars per share)       10.33            
Forfeited (in dollars per share)       9.77            
Nonvested shares at the end of period (in dollars per share)       $ 12.02 $ 11.24          
2006 Plan and 2012 Plan | Restricted stock                    
Shares                    
Nonvested shares at the beginning of the period   162,609                
Granted (in shares)   44,000 98,689 56,500            
Vested (in shares)   (78,815) (101,143)              
Forfeited (in shares)   (4,465) (34,487) (775)            
Nonvested shares at the end of the period   123,329 162,609              
Weighted Average Grant Date Fair Value                    
Nonvested shares at the beginning of period (in dollars per share)   $ 14.36                
Granted (in dollars per share)   14.99 $ 16.03              
Vested (in dollars per share)   13.64 11.94              
Forfeited (in dollars per share)   12.80 11.62              
Nonvested shares at the end of period (in dollars per share)   $ 16.34 $ 14.36              
Unrecognized compensation cost (in dollars)   $ 2.0                
Weighted average period for recognition of unrecognized compensation cost   2 years 9 months 18 days