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Share-based compensation (Tables) | 12 Months Ended
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Dec. 31, 2018
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract] |
Schedule of Share-Based Compensation by Line Item in Consolidated Statements of Income | The following tables present the detail of share-based compensation by line item in the consolidated statements of income as well as by award type, for the years ended December 31, 2018, 2017 and 2016:
|  | Year Ended December 31, |
(U.S. Dollars, in thousands) |  | 2018 |  |  | 2017 |  |  | 2016 |
Cost of sales |  | $ | 522 |  |  | $ | 486 |  |  | $ | 553 |
Sales and marketing |  |  | 1,802 |  |  |  | 1,471 |  |  |  | 1,230 |
General and administrative |  |  | 15,197 |  |  |  | 9,671 |  |  |  | 13,132 |
Research and development |  |  | 1,409 |  |  |  | 929 |  |  |  | 1,051 |
Total |  | $ | 18,930 |  |  | $ | 12,557 |  |  | $ | 15,966 |
|  | Year Ended December 31, |
(U.S. Dollars, in thousands) |  | 2018 |  |  | 2017 |  |  | 2016 |
Stock options |  | $ | 3,061 |  |  | $ | 2,388 |  |  | $ | 2,021 |
Time-based restricted stock awards and stock units |  |  | 7,265 |  |  |  | 5,540 |  |  |  | 6,016 |
Performance-based restricted stock awards and stock units |  |  | 1,998 |  |  |  | 462 |  |  |  | 5,716 |
Market-based restricted stock units |  |  | 5,256 |  |  |  | 2,904 |  |  |  | 948 |
Stock purchase plan |  |  | 1,350 |  |  |  | 1,263 |  |  |  | 1,265 |
Total |  | $ | 18,930 |  |  | $ | 12,557 |  |  | $ | 15,966 |
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, |
|  | 2018 |  |  | 2017 |  |  | 2016 |
Assumptions: |  |  |  |  |  |  |  |  |  |  |  |
Expected term (in years) |  | 4.5 |  |  | 4.5 |  |  | 4.5 |
Expected volatility |  | 28.7% – 30.1% |  |  |  | 31.2 | % |  | 30.6% – 32.3% |
Risk free interest rate |  | 2.55% – 2.79% |  |  |  | 1.93 | % |  | 1.07% – 1.92% |
Dividend yield |  | — |  |  | — |  |  | — |
Weighted average grant date fair value |  | $ | 16.28 |  |  | $ | 13.32 |  |  | $ | 11.79 |
Schedule of Stock Option Plans | Summaries of the status of the Company’s stock option plans as of December 31, 2018 and 2017 and changes during the year ended December 31, 2018 are presented below:
|  | Options |  |  | Weighted Average Exercise Price |  |  | Weighted Average Remaining Contractual Term |
Outstanding at December 31, 2017 |  |  | 1,086,822 |  |  | $ | 37.47 |  |  |  |  |
Granted |  |  | 231,548 |  |  | $ | 57.66 |  |  |  |  |
Exercised |  |  | (100,821 | ) |  | $ | 27.80 |  |  |  |  |
Forfeited |  |  | (41,662 | ) |  | $ | 48.80 |  |  |  |  |
Outstanding at December 31, 2018 |  |  | 1,175,887 |  |  | $ | 41.87 |  |  |  | 6.61 |
Vested and expected to vest at December 31, 2018 |  |  | 1,175,887 |  |  | $ | 41.87 |  |  |  | 6.61 |
Exercisable at December 31, 2018 |  |  | 696,248 |  |  | $ | 36.67 |  |  |  | 5.36 |
Schedule of Changes in Time-Based, Performance-Based and Market-Based Restricted Stock Awards and Stock Units | A summary of the status of our time-based, performance-based and market-based restricted stock awards and stock units as of December 31, 2018 and 2017 and changes during the year ended December 31, 2018 are presented below:
|  | Time-based Restricted Stock Awards and Stock Units |  |  | Performance-based Restricted Stock Awards and Stock Units |  |  | Market-based Restricted Stock Units |
|  | Shares |  |  | Weighted Average Grant Date Fair Value |  |  | Shares |  |  | Weighted Average Grant Date Fair Value |  |  | Shares |  |  | Weighted Average Grant Date Fair Value |
Outstanding at December 31, 2017 |  |  | 325,874 |  |  | $ | 42.44 |  |  |  | 109,880 |  |  | $ | 33.12 |  |  |  | 187,314 |  |  | $ | 51.99 |
Granted |  |  | 172,108 |  |  | $ | 57.18 |  |  |  | — |  |  | $ | — |  |  |  | 97,420 |  |  | $ | 68.38 |
Vested and settled |  |  | (112,249 | ) |  | $ | 40.08 |  |  |  | — |  |  | $ | — |  |  |  | — |  |  | $ | — |
Cancelled |  |  | (28,141 | ) |  | $ | 48.84 |  |  |  | (7,725 | ) |  | $ | 33.12 |  |  |  | (13,439 | ) |  | $ | 60.83 |
Outstanding at December 31, 2018 |  |  | 357,592 |  |  | $ | 49.77 |  |  |  | 102,155 |  |  | $ | 33.12 |  |  |  | 271,295 |  |  | $ | 57.44 |

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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -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=115993241&loc=d3e301413-122809 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5047-113901 + Details
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- Definition Tabular disclosure for stock option plans. Includes, but is not limited to, outstanding awards at beginning and end of year, grants, exercises, forfeitures, and weighted-average grant date fair value. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=109197908&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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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