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Operations and Summary of Significant Accounting Policies (Details 2) (USD $) Share data in Thousands, except Per Share data, unless otherwise specified | 3 Months Ended | 12 Months Ended
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Dec. 31, 2011 | Sep. 30, 2011 | Jun. 30, 2011 | Mar. 31, 2011 | Dec. 31, 2010 | Sep. 30, 2010 | Jun. 30, 2010 | Mar. 31, 2010 | Dec. 31, 2011 cent right series bank vote | Dec. 31, 2010 | Dec. 31, 2009
Common Stock |  |  |  |  |  |  |  |  |  |  |
Number of votes for each share of common stock held |  |  |  |  |  |  |  |  | 1 |  |
Number of rights per common stock as a part of dividend distribution |  |  |  |  |  |  |  |  | 1 |  |
Percentage acquisition of common stock triggering exercise terms of rights, minimum |  |  |  |  |  |  |  |  | 15.00% |  |
Ownership interest held by any stockholder at date of rights distribution to which additional exercise terms for the Rights distributed apply (as a percent) |  |  |  |  |  |  |  |  | 25.00% |  |
Subsequent increase in ownership interest held by any stockholder after rights distribution to which additional exercise terms for the Rights distributed apply (as a percent) |  |  |  |  |  |  |  |  | 40.00% |  |
Redemption price per right (in cents per right) |  |  |  |  |  |  |  |  | 1 |  |
Preferred Stock |  |  |  |  |  |  |  |  |  |  |
Number of series by which the Board may issue authorized and unissued preferred stock, minimum |  |  |  |  |  |  |  |  | 1 |  |
Reconciliation of basic earnings per share ("EPS") to diluted EPS |  |  |  |  |  |  |  |  |  |  |
Earnings from continuing operations, net of tax | $ 4,948,000 | $ 19,380,000 | $ 19,493,000 | $ 7,078,000 | $ (4,499,000) | $ 18,408,000 | $ 21,059,000 | $ 9,830,000 | $ 50,900,000 | $ 44,798,000 | $ 14,121,000
Loss from discontinued operations, net of tax |  |  |  |  |  | (1,226,000) | (14,356,000) | (631,000) |  | (16,212,000) | (1,904,000)
Net income | 4,948,000 | 19,380,000 | 19,493,000 | 7,078,000 | (4,499,000) | 17,182,000 | 6,703,000 | 9,199,000 | 50,900,000 | 28,586,000 | 12,217,000
Basic weighted average shares outstanding |  |  |  |  |  |  |  |  | 48,974 | 49,498 | 49,135
Dilutive effect of potential common stock equivalents - stock options (in shares) |  |  |  |  |  |  |  |  | 49 | 114 | 121
Diluted weighted average shares outstanding |  |  |  |  |  |  |  |  | 49,023 | 49,612 | 49,256
Net earnings (loss) per share - basic: |  |  |  |  |  |  |  |  |  |  |
Continuing operations (in dollars per share) | $ 0.10 | $ 0.40 | $ 0.39 | $ 0.14 | $ (0.09) | $ 0.37 | $ 0.43 | $ 0.20 | $ 1.04 | $ 0.91 | $ 0.29
Discontinued operations (in dollars per share) |  |  |  |  |  | $ (0.02) | $ (0.29) | $ (0.01) |  | $ (0.33) | $ (0.04)
Net income (in dollars per share) | $ 0.10 | $ 0.40 | $ 0.39 | $ 0.14 | $ (0.09) | $ 0.35 | $ 0.14 | $ 0.19 | $ 1.04 | $ 0.58 | $ 0.25
Net earnings (loss) per share - diluted: |  |  |  |  |  |  |  |  |  |  |
Continuing operations (in dollars per share) | $ 0.10 | $ 0.40 | $ 0.39 | $ 0.14 | $ (0.09) | $ 0.37 | $ 0.42 | $ 0.20 | $ 1.04 | $ 0.90 | $ 0.29
Discontinued operations (in dollars per share) |  |  |  |  |  | $ (0.02) | $ (0.29) | $ (0.01) |  | $ (0.33) | $ (0.04)
Net income (in dollars per share) | $ 0.10 | $ 0.40 | $ 0.39 | $ 0.14 | $ (0.09) | $ 0.35 | $ 0.14 | $ 0.19 | $ 1.04 | $ 0.58 | $ 0.25
Potentially dilutive securities excluded from earnings per diluted share because their effect is anti-dilutive (in shares) |  |  |  |  |  |  |  |  | 1,363 | 1,018 | 1,037
Comprehensive Income |  |  |  |  |  |  |  |  |  |  |
Accumulated other comprehensive income (loss), foreign currency translation adjustment, net of tax | 6,800,000 |  |  |  | 14,600,000 |  |  |  | 6,800,000 | 14,600,000 |
Accumulated other comprehensive income, tax | $ 900,000 |  |  |  | $ 900,000 |  |  |  | $ 900,000 | $ 900,000 |
Concentration of Credit Risk |  |  |  |  |  |  |  |  |  |  |
Number of banks holding demand deposit and money market accounts of the entity |  |  |  |  |  |  |  |  | 11 |  |

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- Definition The amount of net income (loss) derived from continuing operations during the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.21) -URI http://asc.fasb.org/extlink&oid=6880815&loc=d3e20235-122688 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 7 -Paragraph 18 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 21 -Article 9 Reference 4: 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 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 5 -Section 03 -Paragraph 20 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6920599&loc=d3e1252-109256 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 128 -Paragraph 11, 12, 36, 37, 38 -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 8: 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 9: 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 + Details
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