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Stock-Based Compensation (Tables) | 3 Months Ended
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Mar. 31, 2018
Schedule of Total Stock-Based Compensation Expense Included in Company's Consolidated Statements of Income and Comprehensive Income | The total stock-based compensation expense included in the Company’s consolidated statements of income and comprehensive income was as follows:
|  | Three Months Ended March 31, 2018 |  |  | Three Months Ended March 31, 2017 |
Cost of revenue |  | $ | 1,005 |  |  | $ | 930 |
Research and development expense |  |  | 722 |  |  |  | 745 |
Selling, general and administrative expense |  |  | 8,699 |  |  |  | 7,107 |
Total pre-tax stock-based compensation expense |  | $ | 10,426 |  |  | $ | 8,782 |
Summary of Activity for RSUs | The following table presents the activity for RSUs under the Plan:
|  | Three Months Ended March 31, 2018 |
|  | Outstanding RSUs |  |  | Weighted Average Grant Date Fair Value |
RSUs — beginning of period |  |  | 943,379 |  |  | $ | 47.57 |
Accrued dividend shares |  |  | 18 |  |  |  | 124.85 |
Granted |  |  | 122,831 |  |  |  | 109.62 |
Vested |  |  | (204,290 | ) |  |  | 40.96 |
Forfeited |  |  | (23,740 | ) |  |  | 61.63 |
RSUs — end of period |  |  | 838,198 |  |  | $ | 57.88 |
Stock Appreciation Rights (SARs) [Member] |
Summary of Activity for Outstanding and Exercisable Stock Appreciation Rights | The following table presents the activity for SARs under the Plan:
|  | Three Months Ended March 31, 2018 |
|  | Outstanding SARs |  |  | Weighted Average Grant Date Fair Value |
SARs — beginning of period |  |  | 282,907 |  |  | $ | 28.62 |
Exercised |  |  | (17,775 | ) |  |  | 27.90 |
Forfeited or expired |  |  | (773 | ) |  |  | 31.13 |
SARs Outstanding — end of period |  |  | 264,359 |  |  | $ | 28.66 |

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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 2 -Subparagraph (h)(1) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 Reference 2: 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=96867065&loc=d3e5047-113901 Reference 3: 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 + Details
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- Definition Tabular disclosure of the changes in outstanding nonvested restricted stock units. + 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=96867065&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of the number and weighted-average exercise prices (or conversion ratios) for stock appreciation rights awards that were outstanding at the beginning and end of the year, and the number of stock appreciation rights awards 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=96867065&loc=d3e5070-113901 + Details
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