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Stock-Based Compensation (Tables) | 6 Months Ended
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Jun. 30, 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 June 30, |  |  | Six Months Ended June 30, |
|  | 2018 |  |  | 2017 |  |  | 2018 |  |  | 2017 |
Cost of revenues |  | $ | 1,489 |  |  | $ | 1,187 |  |  | $ | 2,494 |  |  | $ | 2,117 |
Research and development expense |  |  | 819 |  |  |  | 827 |  |  |  | 1,541 |  |  |  | 1,572 |
Selling, general and administrative expense |  |  | 4,058 |  |  |  | 4,193 |  |  |  | 12,757 |  |  |  | 11,300 |
Total pre-tax stock-based compensation expense |  | $ | 6,366 |  |  | $ | 6,207 |  |  | $ | 16,792 |  |  | $ | 14,989 |
Summary of Activity for RSUs | The following table presents the activity for RSUs under the Plan:
|  | Six Months Ended June 30, 2018 |
|  | Outstanding RSUs |  |  | Weighted Average Grant Date Fair Value |
RSUs – beginning of period |  |  | 943,379 |  |  | $ | 47.57 |
Accrued dividend shares |  |  | 31 |  |  | $ | 115.65 |
Granted |  |  | 259,597 |  |  | $ | 112.56 |
Vested |  |  | (478,238 | ) |  | $ | 44.21 |
Forfeited |  |  | (33,889 | ) |  | $ | 60.77 |
RSUs – end of period |  |  | 689,880 |  |  | $ | 73.71 |
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:
|  | Six Months Ended June 30, 2018 |
|  | Outstanding SARs |  |  | Weighted Average Grant Date Fair Value |
SARs – beginning of period |  |  | 282,907 |  |  | $ | 28.62 |
Exercised |  |  | (79,767 | ) |  | $ | 28.91 |
Forfeited or expired |  |  | (1,950 | ) |  | $ | 29.00 |
SARs Outstanding – end of period |  |  | 201,190 |  |  | $ | 28.50 |

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- Definition Tabular disclosure of the changes in outstanding nonvested restricted stock units. + 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 (c)(2) -URI http://asc.fasb.org/extlink&oid=109197908&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://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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