Annual report pursuant to Section 13 and 15(d)

Shareholders' Equity, Stock Options and Net Income per Share - Stock Option Activity (Details)

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Shareholders' Equity, Stock Options and Net Income per Share - Stock Option Activity (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
12 Months Ended 12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Dec. 31, 2011
Employee Stock Option [Member]
Dec. 31, 2010
Employee Stock Option [Member]
Dec. 31, 2009
Employee Stock Option [Member]
Dec. 31, 2011
Non-employee Director Stock Options [Member]
Dec. 31, 2010
Non-employee Director Stock Options [Member]
Dec. 31, 2008
Non-employee Director Stock Options [Member]
Dec. 31, 2011
Exercise Price Range 13.25 thru 18.82 [Member]
Employee Stock Option [Member]
Years
Dec. 31, 2011
Exercise Price Range 20.21 thru 29.44 [Member]
Employee Stock Option [Member]
Years
Dec. 31, 2011
Exercise Price Range 30.35 thru 35.53 [Member]
Employee Stock Option [Member]
Years
Dec. 31, 2011
Exercise Price Range 13.25 thru 35.53 [Member]
Employee Stock Option [Member]
Years
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                          
Outstanding at beginning of year (shares)       3,702,000 3,086,000 2,446,000 63,000 74,000 74,000        
Granted (shares)       117,000 664,000 675,000              
Exercise of stock options (in shares)       (451,000) (35,000) (1,000) (22,000) (11,000)          
Forfeited (shares)       (5,000) (13,000) (34,000)              
Outstanding at end of year (shares)       3,363,000 3,702,000 3,086,000 41,000 63,000 74,000 263,000 2,297,000 803,000 3,363,000
Outstanding at beginning of year (per share)       $ 26 $ 26 $ 28 $ 22 $ 22 $ 22        
Weighted average exercise price for options granted in the period       $ 29 $ 22 $ 23              
Weighted average exercise price for options exercised in the period       $ 23 $ 21 $ 18 $ 23 $ 24          
Weighted average exercise price for options forfeited in the period       $ 24 $ 26 $ 28              
Outstanding at end of year (per share)       $ 26 $ 26 $ 26 $ 21 $ 22 $ 22 $ 15.08 $ 25.78 $ 31.37 $ 26.28
Exercisable at end of year       2,585,000 2,475,000 1,906,000       263,000 1,519,000 803,000 2,585,000
Weighted average exercise price for options exercisable at year end       $ 27 $ 27 $ 27       $ 15.08 $ 26.95 $ 31.37 $ 27.12
Shares available for grant       1,433,000 1,713,000 2,363,000              
Weighted-average fair value of options granted during the year (dollars per share)       $ 10.68 $ 8.24 $ 7.96              
Aggregate intrinsic value of options exercised       $ 3,771 $ 268 $ 3 $ 202 $ 37          
Average aggregate intrinsic value for options outstanding       14,169                  
Average aggregate instrinsic value for exercisable options       8,717                  
Range of exercise price, lower range limit                   $ 13.25 $ 20.21 $ 30.35 $ 13.25
Range of exercise price, upper range limit                   $ 18.82 $ 29.44 $ 35.53 $ 35.53
Weighted average remaining contractual life                   1.4 4.0 2.4 3.4
Share-based compensation 5,971 6,284 6,754 3,981 5,689 5,832              
Tax benefit related to share-based compensation expense       1,042 1,707 1,691              
Unrecognized compensation cost       2,810                  
Average aggregate intrinsic value for options outstanding and exercisable             $ 385            
Non-employee Director Activity - Options [Abstract]                          
Weighted average remaining contractual term for options outstanding             2.5            
Term of options issued under the plan       7     10