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Common stock (Details) | 12 Months Ended
--- | ---
Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Class of Stock [Line Items] |  |  |
Common stock, Authorized |  |  | 40,000,000
Common Class A [Member] |  |  |
Class of Stock [Line Items] |  |  |
Common stock, Authorized | 40,000,000 | 40,000,000 | 40,000,000
Common stock, Outstanding (in shares) | 6,342,189 | 6,342,189 | 6,342,189
Conversions (in shares) | 0 | 0 | 0
Repurchase of common stock (in shares) | 0 |  | 0
Restricted stock issued - directors (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, Outstanding (in shares) | 6,342,189 | 6,342,189 | 6,342,189
Common Class B [Member] |  |  |
Class of Stock [Line Items] |  |  |
Common stock, Authorized | 40,000,000 | 40,000,000 | 40,000,000
Common stock, Outstanding (in shares) | 2,531,926 | 2,531,926 | 2,542,021
Conversions (in shares) | (11,504) | 0 | (10,095)
Repurchase of common stock (in shares) | 0 |  | 0
Restricted stock issued - directors (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, Outstanding (in shares) | 2,520,422 | 2,531,926 | 2,531,926
Common Class E [Member] |  |  |
Class of Stock [Line Items] |  |  |
Common stock, Authorized | 100,000,000 | 100,000,000 | 100,000,000
Common stock, Outstanding (in shares) | 29,271,067 | 28,257,827 | 27,826,330
Conversions (in shares) | 11,503 | 0 | 10,095
Repurchase of common stock (in shares) | (1,083) |  | 0
Restricted stock issued - directors (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 stock, Outstanding (in shares) | 29,710,556 | 29,271,067 | 28,257,827
Common Class F [Member] |  |  |
Class of Stock [Line Items] |  |  |
Common stock, Authorized | 100,000,000 | 100,000,000 | 100,000,000
Common stock, Outstanding (in shares) | 0 | 0 | 0
Conversions (in shares) | 0 | 0 | 0
Repurchase of common stock (in shares) | 0 |  | 0
Restricted stock issued - directors (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, Outstanding (in shares) | 0 | 0 | 0
Common Stock [Member] |  |  |
Class of Stock [Line Items] |  |  |
Common stock, Authorized | 280,000,000 | 280,000,000 | 280,000,000
Common stock, Outstanding (in shares) | 38,145,182 | 37,131,942 | 36,710,540
Conversions (in shares) | (1) | 0 | 0
Repurchase of common stock (in shares) | (1,083) |  | 0
Restricted stock issued - directors (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 stock, Outstanding (in shares) | 38,573,167 | 38,145,182 | 37,131,942

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