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EARNINGS PER SHARE (Details) (USD $) In Thousands, except Share data, unless otherwise specified | 3 Months Ended | 12 Months Ended
--- | --- | ---
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
Numerator [Abstract] |  |  |  |  |  |  |  |  |  |  |
Net income | $ 6,779 | $ 3,314 | $ 2,361 | $ 2,457 | $ 16,958 | $ 118 | $ (942) | $ (671) | $ 14,911 | $ 15,463 | $ 8,444
Diluted net earnings per share |  |  |  |  |  |  |  |  |  |  |
Antidilutive shares excluded from the denominator due to the options' exercise prices being greater than the average market price (in shares) |  |  |  |  |  |  |  |  | 50,000 | 772,000 | 878,000
Common Stock [Member] |  |  |  |  |  |  |  |  |  |  |
Numerator [Abstract] |  |  |  |  |  |  |  |  |  |  |
Distributed earnings |  |  |  |  |  |  |  |  | 21,721 | 2,244 | 1,850
Undistributed earnings (loss) |  |  |  |  |  |  |  |  | (8,522) | 11,005 | 5,288
Net income |  |  |  |  |  |  |  |  | 13,199 | 13,249 | 7,138
Class A Common earnings |  |  |  |  |  |  |  |  | 1,712 | 2,214 | 1,306
Diluted |  |  |  |  |  |  |  |  | 14,911 | 15,463 | 8,444
Denominator [Abstract] |  |  |  |  |  |  |  |  |  |  |
Weighted average shares outstanding - basic (in shares) |  |  |  |  |  |  |  |  | 19,096,000 | 18,633,000 | 18,156,000
Assumed conversion of Class A Common Stock (in shares) |  |  |  |  |  |  |  |  | 2,943,000 | 3,287,000 | 3,563,000
Dilutive options, awards and common stock equivalents (in shares) |  |  |  |  |  |  |  |  | 343,000 | 233,000 | 251,000
Total weighted-average diluted Common Stock (in shares) |  |  |  |  |  |  |  |  | 22,382,000 | 22,153,000 | 21,970,000
Basic net earnings per share |  |  |  |  |  |  |  |  |  |  |
Common stock (in dollars per share) | $ 0.31 | $ 0.15 | $ 0.11 | $ 0.11 | $ 0.78 | $ 0.01 | $ (0.04) | $ (0.03) | $ 0.69 | $ 0.71 | $ 0.39
Diluted net earnings per share |  |  |  |  |  |  |  |  |  |  |
Common stock (in dollars per share) | $ 0.30 | $ 0.15 | $ 0.11 | $ 0.11 | $ 0.76 | $ 0.01 | $ (0.04) | $ (0.03) | $ 0.67 | $ 0.70 | $ 0.38
Dividends paid (in dollars per share) | $ 1.00 |  |  |  |  |  |  |  |  |  |
Class A Common Stock [Member] |  |  |  |  |  |  |  |  |  |  |
Numerator [Abstract] |  |  |  |  |  |  |  |  |  |  |
Distributed earnings |  |  |  |  |  |  |  |  | 2,963 | 365 | 318
Undistributed earnings (loss) |  |  |  |  |  |  |  |  | (1,251) | 1,849 | 988
Net income |  |  |  |  |  |  |  |  | $ 1,712 | $ 2,214 | $ 1,306
Denominator [Abstract] |  |  |  |  |  |  |  |  |  |  |
Weighted average shares outstanding - basic (in shares) |  |  |  |  |  |  |  |  | 2,943,000 | 3,287,000 | 3,563,000
Total weighted-average diluted Common Stock (in shares) |  |  |  |  |  |  |  |  | 2,943,000 | 3,287,000 | 3,563,000
Weighted average shares outstanding (in shares) |  |  |  |  |  |  |  |  | 2,943,000 | 3,287,000 | 3,563,000
Basic net earnings per share |  |  |  |  |  |  |  |  |  |  |
Common stock (in dollars per share) | $ 0.28 | $ 0.14 | $ 0.10 | $ 0.11 | $ 0.74 | $ 0.01 | $ (0.04) | $ (0.03) | $ 0.58 | $ 0.67 | $ 0.37
Diluted net earnings per share |  |  |  |  |  |  |  |  |  |  |
Common stock (in dollars per share) | $ 0.29 | $ 0.14 | $ 0.10 | $ 0.11 | $ 0.73 | $ 0.01 | $ (0.04) | $ (0.03) | $ 0.59 | $ 0.67 | $ 0.36
Dividends paid (in dollars per share) | $ 0.95 |  |  |  |  |  |  |  |  |  |

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- Definition Number of [basic] shares or units, after adjustment for contingently issuable shares or units and other shares or units not deemed outstanding, determined by relating the portion of time within a reporting period that common shares or units have been outstanding to the total time in that period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 128 -Paragraph 40 -Subparagraph a -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 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=7655603&loc=d3e1448-109256 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 128 -Paragraph 8 -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 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Emerging Issues Task Force (EITF) -Number 07-4 -Paragraph 4 -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 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 128 -Paragraph 171 -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 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Weighted-Average Number of Common Shares Outstanding -URI http://asc.fasb.org/extlink&oid=6528421 + Details
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