Annual report pursuant to Section 13 and 15(d)

Stockholders' Equity and Stock Based Compensation (Details 4)

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Stockholders' Equity and Stock Based Compensation (Details 4) (USD $)
In Millions, except Share data, unless otherwise specified
 1 Months Ended 12 Months Ended
Aug. 31, 2006
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)   1.1 1.1 1.2      
2006 Plan and 2012 Plan | Restricted stock awards
              
Shares              
Nonvested shares at the beginning of the period   262,275 358,650 327,250      
Granted (in shares)   92,000 15,000 150,500      
Vested (in shares)   (99,600) (103,000) (113,225)      
Forfeited (in shares)   (3,525) (8,375) (5,875)      
Nonvested shares at the end of the period   251,150 262,275 358,650      
Weighted Average Grant Date Fair Value              
Nonvested shares at the beginning of period (in dollars per share)   10.44 10.18 11.03      
Granted (in dollars per share)   12.32 14.35 8.57      
Vested (in dollars per share)   10.10 10.28 10.49      
Forfeited (in dollars per share)   11.79 8.45 9.21      
Nonvested shares at the end of period (in dollars per share)   11.24 10.44 10.18      
Unrecognized compensation cost (in dollars)   2.8          
Weighted average period for recognition of unrecognized compensation cost   3 years 4 months 24 days          
2006 Plan | Restricted stock awards
              
Shares              
Granted (in shares) 315,000 92,000 15,000 150,500 140,000 57,500 30,000
Forfeited (in shares)   (3,525) (8,375) (5,875)   (3,500) (12,500)