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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, 2013 | Sep. 29, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2012 | Sep. 30, 2012 | Jun. 30, 2012 | Mar. 31, 2012 | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2013 Class A common stock | Dec. 31, 2012 Class A common stock | Dec. 31, 2011 Class A common stock | Dec. 31, 2013 Class B common stock | Dec. 31, 2012 Class B common stock | Dec. 31, 2011 Class B common stock | Dec. 31, 2013 Management Stock Purchase Plan Restricted stock units (RSUs) | 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, 2013 $13.25-$19.87 Management Stock Purchase Plan Restricted stock units (RSUs) | Dec. 31, 2013 $25.15-$26.51 Management Stock Purchase Plan Restricted stock units (RSUs) | Dec. 31, 2013 $31.63-$31.63 Management Stock Purchase Plan Restricted stock units (RSUs)
Information about RSUs outstanding |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Low end of purchase price range (in dollars per share) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 13.25 | $ 25.15 | $ 31.63
High end of purchase price range (in dollars per share) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 19.87 | $ 26.51 | $ 31.63
RSUs Outstanding |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number Outstanding (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 132 | 196 | 392 | 361 | 2 | 91 | 39
Weighted Average Purchase Price (in dollars per share) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 27.46 | $ 22.88 | $ 18.74 | $ 16.92 | $ 16.21 | $ 25.88 | $ 31.63
RSUs Vested |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number Vested (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 42 | 81 | 157 |  | 2 | 40 |
Weighted Average Purchase Price (in dollars per share) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 25.30 | $ 20.36 | $ 15.57 |  | $ 16.21 | $ 25.69 |
Dividends per common share (in dollars per share) | $ 0.13 | $ 0.13 | $ 0.13 | $ 0.11 | $ 0.11 | $ 0.11 | $ 0.11 | $ 0.11 | $ 0.50 | $ 0.44 | $ 0.44 | $ 0.50 | $ 0.44 | $ 0.44 | $ 0.50 | $ 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=27012166&loc=d3e187085-122770 + Details
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