XML 156 R101.htm IDEA: XBRL DOCUMENT v2.4.0.8
Common stock (Details 1) (USD $)
In Thousands, except Share data, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Class of Stock [Line Items]      
Treasury Stock Value outstanding $ 91,452    
Restricted stock issued 0 0 0
Treasury Stock Value outstanding 82,008 91,452  
Class Common Stock [Member]
      
Class of Stock [Line Items]      
Repurchase of common stock (in shares) 0   0
Restricted stock issued (In shares) 0 0 0
Exercised stock options - compensation plans (in shares) 0 0 0
Restricted stock units - vested (in shares) 0 0 0
Common Class B [Member]
      
Class of Stock [Line Items]      
Repurchase of common stock (in shares) 0   0
Restricted stock issued (In shares) 0 0 0
Exercised stock options - compensation plans (in shares) 0 0 0
Restricted stock units - vested (in shares) 0 0 0
Common Class E [Member]
      
Class of Stock [Line Items]      
Repurchase of common stock (in shares) 1,083   0
Restricted stock issued (In shares) (28,500) (32,317) (25,541)
Exercised stock options - compensation plans (in shares) (276,079) (895,674) (325,996)
Restricted stock units - vested (in shares) 124,490 85,249 69,865
Common Class F [Member]
      
Class of Stock [Line Items]      
Repurchase of common stock (in shares) 0   0
Restricted stock issued (In shares) 0 0 0
Exercised stock options - compensation plans (in shares) 0 0 0
Restricted stock units - vested (in shares) 0 0 0
Common Stock [Member]
      
Class of Stock [Line Items]      
Repurchase of common stock (in shares) 1,083   0
Restricted stock issued (In shares) (28,500) (32,317) (25,541)
Exercised stock options - compensation plans (in shares) (276,079) (895,674) (325,996)
Restricted stock units - vested (in shares) 124,490 85,249 69,865
Treasury stock
      
Class of Stock [Line Items]      
Treasury Stock Value outstanding 91,452 115,617 125,667
Treasury Stock, outstanding (in shares) 3,834,658 4,847,898 5,269,300
Repurchase of common stock 27   0
Repurchase of common stock (in shares) 1,083   0
Restricted stock issued (629) (771) (609)
Restricted stock issued (In shares) (28,500) (32,317) (25,541)
Exercised stock options - compensation plans (6,094) (21,361) (7,775)
Exercised stock options - compensation plans (in shares) (276,079) (895,674) (325,996)
Restricted stock units - vested (2,748) (2,033) (1,666)
Restricted stock units - vested (in shares) (124,490) (85,249) (69,865)
Treasury Stock Value outstanding 82,008 91,452 115,617
Treasury Stock, outstanding (in shares) 3,406,672 3,834,658 4,847,898
Treasury stock | Class Common Stock [Member]
      
Class of Stock [Line Items]      
Treasury Stock Value outstanding 10,708 10,708 10,708
Treasury Stock, outstanding (in shares) 318,140 318,140 318,140
Repurchase of common stock 0   0
Repurchase of common stock (in shares) 0   0
Restricted stock issued 0 0 0
Restricted stock issued (In shares) 0 0 0
Exercised stock options - compensation plans 0 0 0
Exercised stock options - compensation plans (in shares) 0 0 0
Restricted stock units - vested 0 0 0
Restricted stock units - vested (in shares) 0 0 0
Treasury Stock Value outstanding 10,708 10,708 10,708
Treasury Stock, outstanding (in shares) 318,140 318,140 318,140
Treasury stock | Common Class B [Member]
      
Class of Stock [Line Items]      
Treasury Stock Value outstanding 15,655 15,655 15,655
Treasury Stock, outstanding (in shares) 568,010 568,010 568,010
Repurchase of common stock 0   0
Repurchase of common stock (in shares) 0   0
Restricted stock issued 0 0 0
Restricted stock issued (In shares) 0 0 0
Exercised stock options - compensation plans 0 0 0
Exercised stock options - compensation plans (in shares) 0 0 0
Restricted stock units - vested 0 0 0
Restricted stock units - vested (in shares) 0 0 0
Treasury Stock Value outstanding 15,655 15,655 15,655
Treasury Stock, outstanding (in shares) 568,010 568,010 568,010
Treasury stock | Common Class E [Member]
      
Class of Stock [Line Items]      
Treasury Stock Value outstanding 65,089 89,254 99,304
Treasury Stock, outstanding (in shares) 2,948,508 3,961,748 4,383,150
Repurchase of common stock 27   0
Repurchase of common stock (in shares) 1,083   0
Restricted stock issued (629) (771) (609)
Restricted stock issued (In shares) (28,500) (32,317) (25,541)
Exercised stock options - compensation plans (6,094) (21,361) (7,775)
Exercised stock options - compensation plans (in shares) (276,079) (895,674) (325,996)
Restricted stock units - vested (2,748) (2,033) (1,666)
Restricted stock units - vested (in shares) (124,490) (85,249) (69,865)
Treasury Stock Value outstanding $ 55,645 $ 65,089 $ 89,254
Treasury Stock, outstanding (in shares) 2,520,522 2,948,508 3,961,748