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Share-based compensation (Tables) | 12 Months Ended
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Dec. 31, 2016
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract] |
Schedule of Share-Based Compensation by Line Item in Consolidated Statements of Operations | The following tables present the detail of share-based compensation by line item in the consolidated statements of operations as well as by award type, for the years ended December 31, 2016, 2015 and 2014:
|  | Year Ended December 31, |
(U.S. Dollars, in thousands) |  | 2016 |  |  | 2015 |  |  | 2014 |
Cost of sales |  | $ | 553 |  |  | $ | 440 |  |  | $ | 137 |
Sales and marketing |  |  | 1,230 |  |  |  | 1,304 |  |  |  | 1,701 |
General and administrative |  |  | 13,132 |  |  |  | 5,051 |  |  |  | 3,578 |
Research and development |  |  | 1,051 |  |  |  | 419 |  |  |  | 308 |
Total |  | $ | 15,966 |  |  | $ | 7,214 |  |  | $ | 5,724 |
|  | Year Ended December 31, |
(U.S. Dollars, in thousands) |  | 2016 |  |  | 2015 |  |  | 2014 |
Stock options |  | $ | 2,021 |  |  | $ | 1,437 |  |  | $ | 1,391 |
Time-based restricted stock awards |  |  | 6,016 |  |  |  | 4,606 |  |  |  | 3,400 |
Performance-based restricted stock awards |  |  | 5,716 |  |  | — |  |  | — |
Performance-based and market-based restricted stock units |  |  | 948 |  |  |  | — |  |  |  | — |
Stock purchase plan |  |  | 1,265 |  |  |  | 1,171 |  |  |  | 933 |
Total |  | $ | 15,966 |  |  | $ | 7,214 |  |  | $ | 5,724 |
Schedule of Assumptions Used in Determining Fair Value of Stock Options | A summary of the Company’s assumptions used in determining the fair value of the stock options granted during the year is shown in the following table.
|  | Year Ended December 31, |
Assumptions: |  | 2016 |  |  | 2015 |  |  | 2014 |
Expected term (in years) |  | 4.50 |  |  | 4.50 |  |  | 5.00 |
Expected volatility |  | 30.6% – 32.3% |  |  | 31.1% – 31.6% |  |  | 31.7% – 34.5% |
Risk free interest rate |  | 1.07% – 1.92% |  |  | 1.37% – 1.54% |  |  | 1.52% – 1.70% |
Dividend yield |  | — |  |  | — |  |  | — |
Weighted average grant date fair value |  | $ | 11.79 |  |  | $ | 9.49 |  |  | $ | 10.45 |
Schedule of Stock Option Plans | Summaries of the status of the Company’s stock option plans as of December 31, 2016 and 2015 and changes during the year ended December 31, 2016 are presented below:
|  | Options |  |  | Weighted Average Exercise Price |  |  | Weighted Average Remaining Contractual Term |
Outstanding at December 31, 2015 |  |  | 1,412,602 |  |  | $ | 34.26 |  |  |  |  |
Granted |  |  | 250,432 |  |  | $ | 43.04 |  |  |  |  |
Exercised |  |  | (469,945 | ) |  | $ | 34.50 |  |  |  |  |
Forfeited |  |  | (55,910 | ) |  | $ | 35.04 |  |  |  |  |
Outstanding at December 31, 2016 |  |  | 1,137,179 |  |  | $ | 36.05 |  |  |  | 6.69 |
Vested and expected to vest at December 31, 2016 |  |  | 1,137,179 |  |  | $ | 36.05 |  |  |  | 6.69 |
Exercisable at December 31, 2016 |  |  | 464,206 |  |  | $ | 33.76 |  |  |  | 4.57 |
Schedule of Stock Options Outstanding and Exercisable by Exercise Price Range | The table below summarizes the options outstanding and exercisable by exercise price range as of December 31, 2016:
|  | 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 |
$16.62 – $25.01 |  |  | 106,207 |  |  |  | 5.74 |  |  | $ | 22.32 |  |  |  | 80,271 |  |  | $ | 22.55 |
$25.05 – $29.23 |  |  | 102,750 |  |  |  | 5.06 |  |  | $ | 27.57 |  |  |  | 82,750 |  |  | $ | 27.82 |
$30.78 – $32.28 |  |  | 99,650 |  |  |  | 6.63 |  |  | $ | 31.96 |  |  |  | 57,288 |  |  | $ | 31.90 |
$33.12 – $33.12 |  |  | 142,815 |  |  |  | 8.50 |  |  | $ | 33.12 |  |  |  | 35,708 |  |  | $ | 33.12 |
$33.24 – $36.25 |  |  | 121,875 |  |  |  | 7.74 |  |  | $ | 35.51 |  |  |  | 52,051 |  |  | $ | 35.82 |
$36.46 – $40.19 |  |  | 262,750 |  |  |  | 6.64 |  |  | $ | 38.93 |  |  |  | 45,438 |  |  | $ | 39.24 |
$41.73 – $42.89 |  |  | 59,500 |  |  |  | 4.71 |  |  | $ | 41.93 |  |  |  | 37,500 |  |  | $ | 41.37 |
$44.39 – $44.39 |  |  | 168,432 |  |  |  | 9.50 |  |  | $ | 44.39 |  |  |  | — |  |  | $ | — |
$44.87 – $50.50 |  |  | 65,700 |  |  |  | 0.48 |  |  | $ | 45.17 |  |  |  | 65,700 |  |  | $ | 45.17 |
$50.99 – $50.99 |  |  | 7,500 |  |  |  | 0.04 |  |  | $ | 50.99 |  |  |  | 7,500 |  |  | $ | 50.99 |
$16.62 – $50.99 |  |  | 1,137,179 |  |  |  | 6.69 |  |  | $ | 36.05 |  |  |  | 464,206 |  |  | $ | 33.76 |
Schedule of Changes in Restricted Stock and Stock Units | A summary of the status of our restricted stock and stock units as of December 31, 2016 and 2015 and changes during the year ended December 31, 2016 are presented below:
|  | Time-based Awards |  |  | Performance-based Awards |  |  | Performance-based or Market-based Stock Units |
|  | Shares |  |  | Weighted Average Grant Date Fair Value |  |  | Shares |  |  | Weighted Average Grant Date Fair Value |  |  | Shares |  |  | Weighted Average Grant Date Fair Value |
Non-vested as of December 31, 2015 |  |  | 379,138 |  |  | $ | 32.15 |  |  |  | 192,310 |  |  | $ | 34.45 |  |  |  | 55,330 |  |  | $ | 33.12 |
Granted |  |  | 186,515 |  |  | $ | 43.73 |  |  |  | — |  |  | $ | — |  |  |  | 96,245 |  |  | $ | 49.53 |
Vested |  |  | (171,451 | ) |  | $ | 31.86 |  |  |  | — |  |  | $ | — |  |  |  | — |  |  | $ | — |
Cancelled |  |  | (35,283 | ) |  | $ | 32.54 |  |  |  | — |  |  | $ | — |  |  |  | — |  |  | $ | — |
Non-vested as of December 31, 2016 |  |  | 358,919 |  |  | $ | 38.27 |  |  |  | 192,310 |  |  | $ | 34.45 |  |  |  | 151,575 |  |  | $ | 43.54 |

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