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Stock-Based Compensation (Tables) | 12 Months Ended
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Dec. 31, 2018
Stock-Based Compensation [Abstract] |
Schedule of Assumptions Used to Estimate Fair Value of Stock Options |
﻿ |  |  |  |  |  |  |  |  |
﻿ |  |  |  |  |  |  |  |  |
﻿ |  |  | For the year ended December 31,
﻿ |  |  | 2018 |  |  | 2017 |  |  | 2016
﻿ |  |  |  |  |  |  |  |  |
﻿Risk free interest rate |  |  | 2.57% - 2.92% |  |  | 1.70% - 1.97% |  |  | 1.11% - 1.43%
﻿Dividend yield |  |  | 0.7% |  |  | 0.0% |  |  | 0.0%
﻿Expected volatility |  |  | 21.6% |  |  | 20.0% |  |  | 20.0%
﻿Expected lives |  |  | 4.6 years |  |  | 4.6 years |  |  | 4.7 years
﻿
Summary of Stock Option Activity |
﻿ |  |  |  |  |  |  |  |  |  |
﻿ |  |  |  |  |  |  |  |  |  |
﻿ |  |  |  | Weighted- |  | Weighted-Average |  |  |
﻿ |  |  |  | Average |  | Remaining |  |  |
﻿ |  | Number |  | Exercise Price |  | Contractual |  | Aggregate
﻿ |  | of Shares |  | Per Share |  | Life (in years) |  | Intrinsic Value
﻿Outstanding at December 31, 2015 |  | 3,794 |  | $ | 84.66 |  |  |  |  |
﻿Granted |  | 1,357 |  | $ | 96.64 |  |  |  |  |
﻿Exercised |  | (603) |  | $ | 46.03 |  |  |  |  |
﻿Forfeited/canceled |  | (101) |  | $ | 105.37 |  |  |  |  |
﻿Outstanding at December 31, 2016 |  | 4,447 |  | $ | 93.09 |  |  |  |  |
﻿Granted |  | 1,171 |  | $ | 115.41 |  |  |  |  |
﻿Exercised |  | (709) |  | $ | 80.73 |  |  |  |  |
﻿Forfeited/canceled |  | (67) |  | $ | 105.81 |  |  |  |  |
﻿Outstanding at December 31, 2017 |  | 4,842 |  | $ | 100.12 |  |  |  |  |
﻿Granted |  | 941 |  | $ | 156.55 |  |  |  |  |
﻿Exercised |  | (926) |  | $ | 81.73 |  |  |  |  |
﻿Forfeited/canceled |  | (41) |  | $ | 123.98 |  |  |  |  |
﻿Outstanding at December 31, 2018 |  | 4,816 |  | $ | 114.48 |  | 4.2 |  | $ | 228,248
﻿Exercisable at December 31, 2018 |  | 2,162 |  | $ | 100.15 |  | 3.0 |  | $ | 133,490
﻿Unvested at December 31, 2018 |  | 2,654 |  | $ | 126.17 |  | 5.1 |  | $ | 94,758
﻿
Additional Information Regarding Options Outstanding And Exercisable |
﻿ |  |  |  |  |  |  |  |  |  |  |  |
﻿ |  |  |  |  |  |  |  |  |  |  |  |
﻿ |  | Options Outstanding |  | Options Exercisable
﻿ |  |  |  | Weighted Average |  | Weighted |  |  |  | Weighted
﻿ |  |  |  | Remaining |  | Average |  |  |  | Average
﻿Range |  | Outstanding |  | Contractual Life |  | Exercise Price |  | Exercisable |  | Exercise Price
﻿ |  | (in thousands) |  | (in years) |  |  |  |  | (in thousands) |  |  |
﻿$0.00 - $90.00 |  | 406 |  | 1.0 |  | $ | 68.96 |  | 406 |  | $ | 68.96
﻿$90.01 - $110.00 |  | 1,609 |  | 3.5 |  | $ | 96.29 |  | 983 |  | $ | 96.08
﻿$110.01 - $145.00 |  | 1,871 |  | 4.4 |  | $ | 119.15 |  | 773 |  | $ | 121.69
﻿$145.01 - $175.00 |  | 930 |  | 6.2 |  | $ | 156.55 |  | — |  | $ | 0.00
﻿ |  | 4,816 |  |  |  |  |  |  | 2,162 |  |  |
﻿
Summary of Activity of Options Outstanding not yet Vested |
﻿ |  |  |  |  |
﻿ |  |  |  |  |
﻿ |  |  |  | Weighted-
﻿ |  |  |  | Average
﻿ |  | Number |  | Fair Value
﻿ |  | of Shares |  | Per Share
﻿ |  | (in thousands) |  |  |
﻿Unvested as of December 31, 2017 |  | 2,860 |  | $ | 22.08
﻿Shares granted |  | 941 |  | $ | 33.01
﻿Vesting during period |  | (1,104) |  | $ | 21.74
﻿Forfeited/canceled |  | (43) |  | $ | 26.32
﻿Unvested as of December 31, 2018 |  | 2,654 |  | $ | 26.05
﻿
Summary of Restricted Stock Unit Activity |
﻿ |  |  |  |  |  |  |  |  |  |
﻿ |  |  |  |  |  |  |  |  |  |
﻿ |  |  |  |  |  |  |  |  | Weighted-Average
﻿ |  |  |  |  |  |  | Number of |  | Grant Date Fair
﻿ |  |  |  |  |  |  | Shares |  | Value per Share
﻿ |  |  |  |  |  |  | (in thousands) |  |  |
﻿Outstanding at December 31, 2017 |  |  |  |  |  |  | 328 |  | $ | 110.20
﻿Granted |  |  |  |  |  |  | 138 |  | $ | 156.61
﻿Vested |  |  |  |  |  |  | (129) |  | $ | 110.93
﻿Forfeited/canceled |  |  |  |  |  |  | (13) |  | $ | 135.22
﻿Outstanding at December 31, 2018 |  |  |  |  |  |  | 324 |  | $ | 128.69
﻿
Schedule of Non-Cash Compensation Expense |
﻿ |  |  |  |  |  |  |  |  |
﻿ |  |  |  |  |  |  |  |  |
﻿ |  |  | For the year ended December 31,
﻿ |  | 2018 |  | 2017 |  | 2016
﻿ |  | (in thousands)
﻿Cost of revenues |  | $ | 1,182 |  | $ | 1,013 |  | $ | 418
﻿Selling, general and administrative |  |  | 41,145 |  |  | 37,236 |  |  | 32,497
﻿Total cost of non-cash compensation included |  |  |  |  |  |  |  |  |
﻿in loss before provision for income taxes |  |  | 42,327 |  |  | 38,249 |  |  | 32,915
﻿Amount of income tax recognized in earnings |  |  | — |  |  | — |  |  | —
﻿Amount charged against loss |  | $ | 42,327 |  | $ | 38,249 |  | $ | 32,915
﻿

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