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Cash and stock-based compensation plans (Details Textual) (USD $) In Thousands, except Share data, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Exercised stock options | $ 13,136 | $ 4,101 | $ 834
Deferred Compensation Plan (Dc Plan) [Member] |  |  |
Allocated Share-based Compensation Expense | 1 | 1 | 11
Stock Purchase Options [Member] |  |  |
Stock Based Compensation Vesting Rate | 25.00% |  |
Allocated Share-based Compensation Expense | 485 | 765 | 742
Unallocated Share Based Compensation Expense | 474 |  |
Unamortized Compensation Cost Amortization Period | 2 years 15 days |  |
Exercisable Aggregate intrinsic value | 841 |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Total Intrinsic Value | 3,375 | 1,322 | 383
Exercisable Options | 92,316 |  |
Exercised stock options | 5,709 | 2,949 | 834
Stock Option Plan 2006 - Directors and Executives [Member] |  |  |
Allocated Share-based Compensation Expense |  | 25 | 221
Exercisable Aggregate intrinsic value | 260 | 0 |
Exercisable Options | 49,804 |  |
Exercised stock options | 2,130 | 450 |
Indexed Stock Option Plan [Member] |  |  |
Allocated Share-based Compensation Expense |  |  | 17
Exercisable Aggregate intrinsic value | 1,213 | 235 |
Exercisable Options | 0 |  |
Exercised stock options | 5,292 | 672 |
Restricted Stock Directors [Member] |  |  |
Stock Based Compensation Vesting Rate | 25.00% | 20.00% |
Stock Based Compensation Grants Fair Value | 714 | 462 | 475
Allocated Share-based Compensation Expense | 428 | 414 | 270
Unallocated Share Based Compensation Expense | 1,326 |  |
Unamortized Compensation Cost Amortization Period | 3 years 2 months 12 days |  |
Vested Aggregate intrinsic value | 337 | 415 | 180
Restricted Stock Units and Stock Purchase Options Granted To Certain Executives [Member] |  |  |
Stock Based Compensation Vesting Rate | 25.00% |  |
Stock Based Compensation Grants Fair Value | 3,700 | 1,700 | 2,400
Allocated Share-based Compensation Expense | 1,317 | 1,020 | 742
Unallocated Share Based Compensation Expense | 3,076 |  |
Unamortized Compensation Cost Amortization Period | 2 years 3 months 4 days |  |
Vested Aggregate intrinsic value | 1,050 | 775 | 476
Distribution Of The Fair Value In Restricted Stock Units | 3,200 | 1,500 |
Distribution Of The Fair Value In Stock Purchase Options | 500 | 200 |
Percentage Distribution Of Total Grant |  |  | 50.00%
Other Plans Expatriate Officer Plan [Member] |  |  |
Salaries, Wages and Officers' Compensation | 131 | 119 | 117
Accounts Payable and Accrued Liabilities | 198 | 255 |
Restricted Stock Directors (Discontinued) [Member] |  |  |
Allocated Share-based Compensation Expense | 41 | 87 | 108
Vested Aggregate intrinsic value | $ 75 | $ 110 | $ 115

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- Definition The cash inflow associated with the amount received from holders exercising their stock options. This item inherently excludes any excess tax benefit, which the entity may have realized and reported separately. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph i -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 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3255-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 19 -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 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 18 -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 Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (j) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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