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Cash and stock-based compensation plans (Details Textual) (USD $) | 12 Months Ended
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Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Exercised stock options | $ 3,702,000 | $ 13,136,000 | $ 4,101,000
Deferred Compensation Plan (Dc Plan) [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Allocated Share-based Compensation Expense |  | 1,000 | 1,000
Stock Purchase Options [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Stock Based Compensation Vesting Rate | 25.00% |  |
Allocated Share-based Compensation Expense | 282,000 | 485,000 | 765,000
Unallocated Share Based Compensation Expense | 163,000 |  |
Unamortized Compensation Cost Amortization Period | 1 year 9 months 18 days |  |
Exercisable Aggregate intrinsic value | 888,000 |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Total Intrinsic Value | 2,673,000 | 3,375,000 | 1,322,000
Exercised stock options | 2,886,000 | 5,709,000 | 2,949,000
Stock Option Plan 2006 - Directors and Executives [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Allocated Share-based Compensation Expense |  |  | 25,000
Exercisable Aggregate intrinsic value | 442,000 | 570,000 | 45,000
Exercised stock options | 814,000 | 2,130,000 | 450,000
Indexed Stock Option Plan [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Exercisable Aggregate intrinsic value |  | 1,213,000 | 235,000
Exercised stock options |  | 5,292,000 | 672,000
Restricted Stock Directors [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Stock Granted During Period, Shares, Share-based Compensation | 28,500 | 32,317 | 25,541
Stock Based Compensation Grants Fair Value | 713,000 | 714,000 | 462,000
Allocated Share-based Compensation Expense | 637,000 | 428,000 | 414,000
Unallocated Share Based Compensation Expense | 1,401,000 |  |
Unamortized Compensation Cost Amortization Period | 2 years 4 months 20 days |  |
Vested Aggregate Fair Value | 581,000 | 337,000 | 415,000
Restricted Stock Units and Stock Purchase Options Granted To Certain Executives [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Stock Based Compensation Vesting Rate | 25.00% |  |
Stock Based Compensation Grants Fair Value | 2,100,000 | 3,700,000 | 1,700,000
Allocated Share-based Compensation Expense | 2,077,000 | 1,317,000 | 1,020,000
Unallocated Share Based Compensation Expense | 2,883,000 |  |
Unamortized Compensation Cost Amortization Period | 2 years 6 months 18 days |  |
Vested Aggregate Fair Value | 2,002,000 | 1,050,000 | 775,000
Distribution Of The Fair Value In Restricted Stock Units |  | 3,200,000 | 1,500,000
Distribution Of The Fair Value In Stock Purchase Options |  | 500,000 | 200,000
Other Plans Expatriate Officer Plan [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Salaries, Wages and Officers' Compensation | 120,000 | 131,000 | 119,000
Accounts Payable and Accrued Liabilities | 176,000 | 198,000 |
Restricted Stock Directors (Discontinued) [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Stock Based Compensation Vesting Rate | 20.00% |  |
Allocated Share-based Compensation Expense |  | 41,000 | 87,000
Vested Aggregate Fair Value |  | $ 75,000 | $ 110,000

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- Definition Expenditures for salaries for officers and non-officers. Does not include allocated share-based compensation, pension and post-retirement benefit expense or other labor-related non-salary expense. For commercial and industrial companies, excludes any direct and overhead labor that is included in cost of goods sold. + References No definition available. + Details
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- Definition Fair value of share-based awards for which the grantee gained the right by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Gross number of shares (or other type of equity) issued during the period as a result of any equity-based compensation plan other than an employee stock ownership plan (ESOP). Shares issued could result from the issuance of restricted stock, the exercise of stock options, stock issued under employee stock purchase plans, and/or other employee benefit plans. + References No definition available. + Details
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