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Common stock (Details) (USD $) In Thousands, except Share data, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Restricted stock issued | $ 0 | $ 0 | $ 0
Repurchase of common stock | $ 0 | $ 0 | $ (3)
Common Class A [Member] |  |  |
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
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
Repurchase of common stock (in shares) |  |  | 0
Common stock, outstanding (in shares) | 6,342,189 | 6,342,189 | 6,342,189
Common Class B [Member] |  |  |
Common stock, Authorized | 40,000,000 | 40,000,000 | 40,000,000
Common stock, outstanding (in shares) | 2,531,926 | 2,542,021 | 2,584,882
Conversions (in shares) | 0 | (10,095) | (42,861)
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
Repurchase of common stock (in shares) |  |  | 0
Common stock, outstanding (in shares) | 2,531,926 | 2,531,926 | 2,542,021
Common Class E [Member] |  |  |
Common stock, Authorized | 100,000,000 | 100,000,000 | 100,000,000
Common stock, outstanding (in shares) | 28,257,827 | 27,826,330 | 27,618,545
Conversions (in shares) | 0 | 10,095 | 42,860
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
Repurchase of common stock (in shares) |  |  | (200)
Common stock, outstanding (in shares) | 29,271,067 | 28,257,827 | 27,826,330
Common Class F [Member] |  |  |
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
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
Repurchase of common stock (in shares) |  |  | 0
Common stock, outstanding (in shares) | 0 | 0 | 0
Common Stock [Member] |  |  |
Common stock, Authorized | 280,000,000 | 280,000,000 | 280,000,000
Common stock, outstanding (in shares) | 37,131,942 | 36,710,540 | 36,545,616
Conversions (in shares) | 0 | 0 | (1)
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
Repurchase of common stock (in shares) |  |  | (200)
Common stock, outstanding (in shares) | 38,145,182 | 37,131,942 | 36,710,540

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- Definition Number of shares issued during the period related to Restricted Stock Awards, net of any shares forfeited. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=6959260&loc=d3e187085-122770 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 129 -Paragraph 4, 5 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Principles Board Opinion (APB) -Number 12 -Paragraph 10 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29, 30 -Article 5 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 + Details
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