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Stockholders' Equity and Stock-Based Compensation (Tables) | 12 Months Ended
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Dec. 31, 2017
Summary of Nonvested Restricted Stock Awards Activity | The following table summarizes restricted stock awards activity for the year ended December 31, 2017:
| Time-Based Restricted Stock Awards |  |  | Market-Based Restricted Stock Awards |
| Shares |  |  | Weighted Average Grant Date Fair Value |  |  | Shares |  |  | Weighted Average Grant Date Fair Value |
Unvested shares of restricted stock outstanding at December 31, 2016 |  | 1,429,514 |  |  | $ | 20.56 |  |  |  | 738,425 |  |  | $ | 28.68 |
Granted |  | 309,526 |  |  | $ | 60.00 |  |  |  | 314,021 |  |  | $ | 48.63 |
Vested |  | (681,699 | ) |  | $ | 6.67 |  |  |  | (1,014,429 | ) |  | $ | 34.44 |
Forfeited |  | (168,661 | ) |  | $ | 35.20 |  |  |  | (38,017 | ) |  | $ | 39.87 |
Unvested shares of restricted stock outstanding at December 31, 2017 |  | 888,680 |  |  | $ | 42.17 |  |  |  | - |  |  | $ | - |
Non-cash Stock-based Compensation Resulting From Restricted Stock Awards | The following table presents non-cash stock-based compensation expense resulting from restricted stock awards, which is included in the following line items in the accompanying consolidated statements of income for the years ended December 31, 2017, 2016 and 2015 (dollars in thousands):
|  | Year Ended December 31, |
|  | 2017 |  |  | 2016 |  |  | 2015 |
Operating expense |  | $ | 3,950 |  |  | $ | 2,217 |  |  | $ | 235 |
Sales and marketing |  |  | 6,086 |  |  |  | 3,656 |  |  |  | 559 |
Research and development |  |  | 1,912 |  |  |  | 836 |  |  |  | 104 |
General and administrative |  |  | 26,565 |  |  |  | 15,837 |  |  |  | 2,112 |
Total non-cash stock-based compensation expense |  | $ | 38,513 |  |  | $ | 22,546 |  |  | $ | 3,010 |
Restricted Stock [Member] |
Summary of Grant-Date Fair Values of Restricted Stock Granted and Related Assumptions | The following table presents a summary of the grant-date fair values of restricted stock granted during the years ended December 31, 2017, 2016 and 2015 and the related assumptions:
|  | Year Ended December 31, |
|  | 2017 |  |  | 2016 |  |  | 2015 |
Grant-date fair value of restricted stock |  | $46.78 - $60.67 |  |  | $23.15 - $49.34 |  |  | $21.76 - $33.33 |
Risk-free interest rates |  | 1.85% |  |  | 1.28% - 1.36% |  |  | 2.2% |
Estimated volatility |  | 23.0% |  |  | 21.0% - 23.0% |  |  | 26.0% |
Expected life (in years) |  |  | 2.3 |  |  |  | 2.7 |  |  |  | 3.6 |
Market-based Restricted Stock [Member] |
Summary of Market-based Restricted Stock Vesting Activity | The following table summarizes market-based restricted stock vesting activity during the year ended December 31, 2017, the associated compensation cost recognized in connection with the vesting event and the number of shares withheld to satisfy tax withholding obligations:
Vesting Condition | Date Vested |  | Number of Shares Vested |  |  | Compensation Cost Recognized Upon Vesting (in millions) |  | Shares Withheld for Taxes1 |
Market-based (TEV = $3.5 billion) | May 13, 2017 |  |  | 229,075 |  |  | $2.9 |  |  | 91,274 |
Market-based (TEV = $3.9 billion) | June 20, 2017 |  |  | 248,250 |  |  | $5.2 |  |  | 103,907 |
Market-based (TEV = $4.15 billion) | August 25, 2017 |  |  | 153,764 |  |  | $5.5 |  |  | 65,309 |
Market-based (TEV = $4.2 billion) | September 7, 2017 |  |  | 244,850 |  |  | $4.2 |  |  | 102,548 |
Market-based (TEV = $4.45 billion) | October 13, 2017 |  |  | 138,490 |  |  | $4.3 |  |  | 57,916 |

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- Definition Tabular disclosure of the inputs and valuation techniques used to measure fair value, and a discussion of changes in valuation techniques and related inputs, if any, applied during the period to each separate class of assets, liabilities, and financial instruments classified in shareholders' equity that are measured on a recurring and/or nonrecurring basis. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bbb) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 + Details
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- Definition Tabular disclosure of the changes in outstanding nonvested restricted stock 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) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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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 for share-based compensation 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://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 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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