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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

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