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Stock-Based Compensation (Details 5) (USD $) In Thousands, except Per Share data, unless otherwise specified | 3 Months Ended | 12 Months Ended |  |  |  |  | 12 Months Ended
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Dec. 31, 2012 | Sep. 30, 2012 | Jun. 30, 2012 | Mar. 31, 2012 | Dec. 31, 2011 | Sep. 30, 2011 | Jun. 30, 2011 | Mar. 31, 2011 | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2012 Class A Common Stock | Dec. 31, 2011 Class A Common Stock | Dec. 31, 2010 Class A Common Stock | Dec. 31, 2012 Class B Common Stock | Dec. 31, 2011 Class B Common Stock | Dec. 31, 2010 Class B Common Stock | Dec. 31, 2012 Management Stock Purchase Plan Restricted stock units (RSUs) | Dec. 31, 2011 Management Stock Purchase Plan Restricted stock units (RSUs) | Dec. 31, 2010 Management Stock Purchase Plan Restricted stock units (RSUs) | Dec. 31, 2009 Management Stock Purchase Plan Restricted stock units (RSUs) | Dec. 31, 2012 Range of Purchase Prices $10.51-$19.87 Management Stock Purchase Plan Restricted stock units (RSUs) | Dec. 31, 2012 Range of Purchase Prices $25.15-$25.15 Management Stock Purchase Plan Restricted stock units (RSUs) | Dec. 31, 2012 Range of Purchase Prices $26.51-$26.51 Management Stock Purchase Plan Restricted stock units (RSUs)
Information about RSUs outstanding |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Low end of purchase price range (in dollars per share) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 10.51 | $ 25.15 | $ 26.51
High end of purchase price range (in dollars per share) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 19.87 | $ 25.15 | $ 26.51
RSUs Outstanding |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number Outstanding (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 196 | 392 | 361 | 350 | 86 | 55 | 55
Weighted Average Purchase Price (in dollars per share) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 22.88 | $ 18.74 | $ 16.92 | $ 18.13 | $ 19.14 | $ 25.15 | $ 26.51
RSUs Vested |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number Vested (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 81 | 157 | 105 |  | 61 | 20 |
Weighted Average Purchase Price (in dollars per share) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 20.36 | $ 15.57 | $ 15.21 |  | $ 18.84 | $ 25.15 |
Dividends per common share (in dollars per share) | $ 0.11 | $ 0.11 | $ 0.11 | $ 0.11 | $ 0.11 | $ 0.11 | $ 0.11 | $ 0.11 | $ 0.44 | $ 0.44 | $ 0.44 | $ 0.44 | $ 0.44 | $ 0.44 | $ 0.44 | $ 0.44 | $ 0.44 |  |  |  |  |  |  |

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- Definition Aggregate dividends paid during the period for each share of common stock outstanding. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 Reference 2: 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 + Details
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