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Share-based compensation plans (Tables) | 12 Months Ended
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Dec. 31, 2013
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Schedule of Share-Based Compensation by Line Item in Consolidated Statements of Operations | The following table shows the detail of share-based compensation by line item in the consolidated statements of operations for the years ended December 31, 2013, 2012 and 2011 and the assumptions for each of these years in which grants were awarded:
(U.S. Dollars in thousands, except assumptions) |  | Year Ended December 31, 2013 |  |  | Year Ended December 31, 2012 |  |  | Year Ended December 31, 2011 |
Cost of sales |  | $ | 104 |  |  | $ | 592 |  |  | $ | 153 |
Sales and marketing |  |  | 1,444 |  |  |  | 1,550 |  |  |  | 2,031 |
General and administrative |  |  | 4,483 |  |  |  | 4,023 |  |  |  | 4,322 |
Research and development |  |  | 236 |  |  |  | 138 |  |  |  | 142 |
Total |  | $ | 6,267 |  |  | $ | 6,303 |  |  | $ | 6,648 |
Schedule of Share-based Payment Award, Valuation Assumptions |
Assumptions: |  |  |  |  |  |  |  |  |  |  |  |
Expected term |  |  | 5.00 years |  |  |  | 4.50 years |  |  |  | 4.58 years |
Expected volatility |  |  | 32.1% – 50.8 | % |  |  | 50.9% – 51.8 | % |  |  | 49.6% – 49.9 | %
Risk free interest rate |  |  | 0.58% – 1.52 | % |  |  | 0.76% – 0.84 | % |  |  | .90% – 2.26 | %
Dividend rate |  |  | — |  |  |  | — |  |  |  | — |
Weighted average fair value of options granted during the year |  | $ | 10.83 |  |  | $ | 16.99 |  |  | $ | 14.21 |
Schedule of Stock Option Activity | Summaries of the status of the Company’s stock option plans as of December 31, 2013 and 2012 and changes during the year ended December 31, 2013 are presented below:
|  | Options |  |  | Weighted Average Exercise Price |  |  | Weighted Average Remaining Contractual Term |
Outstanding at December 31, 2012 |  |  | 1,945,955 |  |  | $ | 34.50 |  |  |  |  |
Granted |  |  | 466,250 |  |  | $ | 28.51 |  |  |  |  |
Exercised |  |  | (79,949 | ) |  | $ | 23.25 |  |  |  |  |
Forfeited |  |  | (408,077 | ) |  | $ | 36.33 |  |  |  |  |
Outstanding at December 31, 2013 |  |  | 1,924,179 |  |  | $ | 33.12 |  |  |  | 4.41 |
Vested and expected to vest at December 31, 2013 |  |  | 1,839,383 |  |  | $ | 33.50 |  |  |  | 4.17 |
Options exercisable at December 31, 2013 |  |  | 1,367,269 |  |  | $ | 34.35 |  |  |  | 2.89 |
Schedule of Stock Options Outstanding and Exercisable by Price Range | Outstanding and exercisable by price range as of December 31, 2013
|  | Options Outstanding |  |  | Options Exercisable |
Range of Exercise Prices |  | Number Outstanding |  |  | Weighted Average Remaining Contractual Life |  |  | Weighted Average Exercise Price |  |  | Number Exercisable |  |  | Weighted Average Exercise Price |
$10.42 – $21.78 |  |  | 232,250 |  |  |  | 9.31 |  |  | $ | 20.79 |  |  |  | 16,000 |  |  | $ | 13.31 |
$22.75 – $25.05 |  |  | 326,166 |  |  |  | 4.10 |  |  | $ | 24.73 |  |  |  | 306,166 |  |  | $ | 24.84 |
$26.79 – $28.95 |  |  | 230,000 |  |  |  | 4.79 |  |  | $ | 28.45 |  |  |  | 170,000 |  |  | $ | 28.65 |
$29.23 – $37.36 |  |  | 225,168 |  |  |  | 5.10 |  |  | $ | 33.14 |  |  |  | 169,839 |  |  | $ | 32.41 |
$37.76 – $38.11 |  |  | 230,975 |  |  |  | 1.69 |  |  | $ | 37.99 |  |  |  | 230,975 |  |  | $ | 37.99 |
$38.40 – $40.27 |  |  | 351,354 |  |  |  | 3.17 |  |  | $ | 39.76 |  |  |  | 174,355 |  |  | $ | 39.77 |
$41.33 – $43.04 |  |  | 178,633 |  |  |  | 2.84 |  |  | $ | 41.66 |  |  |  | 150,301 |  |  | $ | 41.72 |
$44.87 – $45.84 |  |  | 140,133 |  |  |  | 3.05 |  |  | $ | 45.02 |  |  |  | 140,133 |  |  | $ | 45.02 |
$50.50 – $50.50 |  |  | 2,000 |  |  |  | 3.01 |  |  | $ | 50.50 |  |  |  | 2,000 |  |  | $ | 50.50 |
$50.99 – $50.99 |  |  | 7,500 |  |  |  | 3.04 |  |  | $ | 50.99 |  |  |  | 7,500 |  |  | $ | 50.99 |
$10.42 – $50.99 |  |  | 1,924,179 |  |  |  | 4.41 |  |  | $ | 33.12 |  |  |  | 1,367,269 |  |  | $ | 34.35 |
Schedule of Changes in Restricted Stock | A summary of the status of our restricted stock as of December 31, 2013 and 2012 and changes during the year ended December 31, 2013 are presented below:
|  | Shares |  |  | Weighted Average Grant Date Fair Value |
Non-vested as of December 31, 2012 |  |  | 160,831 |  |  | $ | 38.34 |
Granted |  |  | 269,791 |  |  | $ | 27.09 |
Vested |  |  | (62,948 | ) |  | $ | 36.58 |
Cancelled |  |  | (80,970 | ) |  | $ | 38.80 |
Non-vested as of December 31, 2013 |  |  | 286,704 |  |  | $ | 28.01 |

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- Definition Tabular disclosure of the allocation of equity-based compensation costs to a given line item on the balance sheet and income statement for the period. This may include the reporting line for the costs and the amount capitalized and expensed. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 14.F) -URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 14 -Section F Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of the changes in outstanding nonvested shares. + 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 (c)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of option exercise prices, by grouped ranges, including the upper and lower limits of the price range, the number of shares under option, weighted average exercise price and remaining contractual option terms. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of the number and weighted-average exercise prices (or conversion ratios) for share options (or share units) that were outstanding at the beginning and end of the year, vested and expected to vest, exercisable or convertible at the end of the year, and the number of share options or share units that were granted, exercised or converted, forfeited, and expired during the year. + 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 (c)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions. + 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 (f)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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