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Common stock (Details 1) (USD $) In Thousands, except Share data, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Treasury Stock Value outstanding | $ 115,617 |  |
Repurchase of common stock | 0 | 0 | 3
Restricted stock issued | 0 | 0 | 0
Treasury Stock Value outstanding | 91,452 | 115,617 |
Class Common Stock [Member] |  |  |
Repurchase of common stock (in shares) |  |  | 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] |  |  |
Repurchase of common stock (in shares) |  |  | 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] |  |  |
Repurchase of common stock (in shares) |  |  | 200
Restricted stock issued (In shares) | (32,317) | 25,541 | 38,115
Exercised stock options - compensation plans (in shares) | 895,674 | 325,996 | 82,106
Restricted stock units - vested (in shares) | 85,249 | 69,865 | 44,904
Common Class F [Member] |  |  |
Repurchase of common stock (in shares) |  |  | 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] |  |  |
Repurchase of common stock (in shares) |  |  | 200
Restricted stock issued (In shares) | 32,317 | 25,541 | 38,115
Exercised stock options - compensation plans (in shares) | 895,674 | 325,996 | 82,106
Restricted stock units - vested (in shares) | 85,249 | 69,865 | 44,904
Treasury stock |  |  |
Treasury Stock Value outstanding | 115,617 | 125,667 | 129,602
Treasury Stock, outstanding (in shares) | 4,847,898 | 5,269,300 | 5,434,225
Repurchase of common stock |  |  | 3
Repurchase of common stock (in shares) |  |  | 200
Restricted stock issued | 771 | 609 | 909
Restricted stock issued (In shares) | (32,317) | (25,541) | (38,115)
Exercised stock options - compensation plans | (21,361) | (7,775) | (1,958)
Exercised stock options - compensation plans (in shares) | (895,674) | (325,996) | (82,106)
Restricted stock units - vested | (2,033) | (1,666) | (1,071)
Restricted stock units - vested (in shares) | (85,249) | (69,865) | (44,904)
Treasury Stock Value outstanding | 91,452 | 115,617 | 125,667
Treasury Stock, outstanding (in shares) | 3,834,658 | 4,847,898 | 5,269,300
Treasury stock | Class Common Stock [Member] |  |  |
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
Repurchase of common stock (in shares) |  |  | 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] |  |  |
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
Repurchase of common stock (in shares) |  |  | 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] |  |  |
Treasury Stock Value outstanding | 89,254 | 99,304 | 103,239
Treasury Stock, outstanding (in shares) | 3,961,748 | 4,383,150 | 4,548,075
Repurchase of common stock |  |  | 3
Repurchase of common stock (in shares) |  |  | 200
Restricted stock issued | (771) | (609) | (909)
Restricted stock issued (In shares) | (32,317) | (25,541) | (38,115)
Exercised stock options - compensation plans | (21,361) | (7,775) | (1,958)
Exercised stock options - compensation plans (in shares) | (895,674) | (325,996) | (82,106)
Restricted stock units - vested | (2,033) | (1,666) | (1,071)
Restricted stock units - vested (in shares) | (85,249) | (69,865) | (44,904)
Treasury Stock Value outstanding | $ 65,089 | $ 89,254 | $ 99,304
Treasury Stock, outstanding (in shares) | 2,948,508 | 3,961,748 | 4,383,150

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