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7. Stockholders' Equity (Details) | 12 Months Ended |  | 12 Months Ended |  | 3 Months Ended
--- | --- | --- | --- | --- | ---
Dec. 31, 2013 Common Class A [Member] | Dec. 31, 2012 Common Class A [Member] | Dec. 31, 2011 Common Class A [Member] | Dec. 31, 2010 Common Class A [Member] | Dec. 31, 2013 Common Class B [Member] | Dec. 31, 2012 Common Class B [Member] | Dec. 31, 2011 Common Class B [Member] | Dec. 31, 2010 Common Class B [Member] | Jun. 30, 2012 Treasury Class-A [Member] | Jun. 30, 2012 Treasury Class B [Member]
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Shares, Issued | 23,681,000 | 23,333,000 | 23,020,000 | 22,677,000 | 5,097,000 | 5,150,000 | 5,165,000 | 5,175,000 |  |
Stock Issued During Period, Shares, Conversion of Convertible Securities | 80,000 | 59,000 | 39,000 |  | (80,000) | (59,000) | (39,000) |  |  |
Stock Issued During Period, Shares, New Issues | 269,000 | 253,000 | 304,000 |  | 27,000 | 44,000 | 28,000 |  |  |
Treasury Stock, Shares, Acquired |  |  |  |  |  |  |  |  | 122 | 917
Voting Rights, Number of Vote Entitled Per Share | 0.1 |  |  |  | 1 |  |  |  |  |
Election Percentage for Board of Directors | 25.00% |  |  |  | 75.00% |  |  |  |  |

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