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Stock Option and Restricted Stock Plans (Details 3) (USD $)
Share data in Thousands, except Per Share data, unless otherwise specified
12 Months Ended 0 Months Ended
Dec. 31, 2012
Restricted stock awards
Dec. 31, 2012
Holdings
Options
Plans
Dec. 31, 2011
Holdings
Options
Plans
Dec. 31, 2010
Holdings
Options
Plans
Dec. 31, 2012
Holdings
Options
Director Plan
Oct. 30, 2012
Holdings
Restricted stock awards
Aug. 07, 2012
Holdings
Restricted stock awards
May 02, 2012
Holdings
Restricted stock awards
Mar. 26, 2012
Holdings
Restricted stock awards
Dec. 15, 2011
Holdings
Restricted stock awards
Nov. 03, 2011
Holdings
Restricted stock awards
Aug. 03, 2011
Holdings
Restricted stock awards
Dec. 17, 2010
Holdings
Restricted stock awards
Nov. 11, 2010
Holdings
Restricted stock awards
Sep. 13, 2010
Holdings
Restricted stock awards
Aug. 11, 2010
Holdings
Restricted stock awards
Stock option and restricted stock plans                                
Weighted average remaining contractual term for all outstanding options   5 years 9 months     5 years 2 months 26 days                      
Weighted average remaining contractual term of exercisable options   5 years 2 months 26 days     5 years 4 days                      
Total intrinsic value of options exercised (in dollars)   $ 1,100,000 $ 200,000 $ 300,000                        
Aggregate intrinsic value of options outstanding (in dollars)   2,600,000     46,500                      
Aggregate intrinsic value of options exercisable (in dollars)   2,200,000     46,500                      
Number of Shares Issued           530 38 129 65 350 190 25 50 300 1,000 30
Fair Value of Common Stock (in dollars per share)           $ 10.75 $ 11.84 $ 8.67 $ 8.33 $ 8.57 $ 8.61 $ 7.14 $ 7.07 $ 6.29 $ 7.48 $ 6.94
Stock compensation expense for each of the next five years, based on restricted stock awards granted                                
2013 6,012,000                              
2014 5,391,000                              
2015 3,734,000                              
2016 1,512,000                              
2017 $ 53,000