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Equity-Based Compensation (Tables) | 6 Months Ended
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Jun. 30, 2019
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract] |
Stock Option Activity | Stock option activity during 2018 and 2019 was as follows (aggregate intrinsic value in thousands):
|  | Number of Options |  |  | Weighted Average Exercise Price |  |  | Weighted Average Remaining Contractual Term (in years) |  |  | Aggregate Intrinsic Value |
Options outstanding at January 1, 2018 |  |  | 974,566 |  |  | $ | 47.89 |  |  |  | 7.46 |  |  | $ | 3,802 |
Options granted |  |  | 374,700 |  |  |  | 37.54 |  |  |  | 9.21 |  |  |  | 246 |
Options exercised |  |  | (20,989 | ) |  |  | 17.83 |  |  | N/A |  |  |  | 383 |
Options cancelled |  |  | (128,737 | ) |  |  | 50.83 |  |  | N/A |  |  | N/A |
Options outstanding at December 31, 2018 |  |  | 1,199,540 |  |  |  | 44.64 |  |  |  | 7.26 |  |  |  | 2,717 |
Options granted |  |  | 566,800 |  |  |  | 28.25 |  |  |  | 9.69 |  |  |  | 1,196 |
Options exercised |  |  | (42,545 | ) |  |  | 20.55 |  |  | N/A |  |  |  | 457 |
Options cancelled |  |  | (214,423 | ) |  |  | 42.49 |  |  | N/A |  |  | N/A |
Options outstanding at June 30, 2019 |  |  | 1,509,372 |  |  | $ | 39.44 |  |  |  | 7.98 |  |  | $ | 1,855 |
Options exercisable at December 31, 2018 |  |  | 534,164 |  |  | $ | 44.98 |  |  |  | 5.73 |  |  | $ | 2,386 |
Options exercisable at June 30, 2019 |  |  | 571,267 |  |  | $ | 47.60 |  |  |  | 6.21 |  |  | $ | 718 |
Schedule of Stock Options Valuation Assumptions | The following table summarizes the grant-date fair value of options and the assumptions used to develop the fair value estimates for options granted during the six months ended June 30, 2019 and year ended December 31, 2018:
|  | June 30, 2019 |  |  | December 31, 2018 |
Weighted average grant-date fair value of options |  | $ | 10.45 |  |  | $ | 13.67 |
Risk-free interest rate |  |  | 2.4 | % |  |  | 2.2 | %
Expected volatility |  |  | 38 | % |  |  | 37 | %
Expected life (in years) |  |  | 5.0 |  |  |  | 5.1 |
Restricted Stock Activity | Restricted stock activity during 2018 and 2019 was as follows:
|  | Number of Shares |  |  | Weighted Average Grant-Date Fair Value |
Unvested at January 1, 2018 |  |  | 809,868 |  |  | $ | 50.19 |
Granted |  |  | 480,137 |  |  |  | 36.84 |
Cancelled |  |  | (88,989 | ) |  |  | 47.57 |
Vested |  |  | (395,959 | ) |  |  | 50.41 |
Unvested at December 31, 2018 |  |  | 805,057 |  |  | $ | 42.40 |
Granted |  |  | 626,279 |  |  |  | 28.47 |
Cancelled |  |  | (289,914 | ) |  |  | 32.35 |
Vested |  |  | (244,667 | ) |  |  | 46.85 |
Unvested at June 30, 2019 |  |  | 896,755 |  |  | $ | 34.71 |
Restricted Stock Unit Activity | Restricted stock unit activity during 2018 and 2019 was as follows:
|  | Number of Units |  |  | Weighted Average Grant-Date Fair Value |
Unvested at January 1, 2018 |  |  | 360,909 |  |  | $ | 50.04 |
Granted |  |  | 285,358 |  |  |  | 42.26 |
Cancelled |  |  | (89,173 | ) |  |  | 55.44 |
Vested |  |  | (72,983 | ) |  |  | 49.64 |
Unvested at December 31, 2018 |  |  | 484,111 |  |  | $ | 44.52 |
Granted |  |  | 168,835 |  |  |  | 36.01 |
Cancelled |  |  | (267,161 | ) |  |  | 45.20 |
Vested |  |  | — |  |  |  | — |
Unvested at June 30, 2019 |  |  | 385,785 |  |  | $ | 40.32 |

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- Definition Tabular disclosure of the number and weighted-average grant date fair value for restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock units that were granted, vested, or forfeited 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=116856206&loc=d3e5070-113901 + 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=116856206&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=116856206&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=116856206&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=116856206&loc=d3e5070-113901 + Details
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- Definition Disclosure of the number and weighted-average grant date fair value for restricted stock and restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock and restricted stock units that were granted, vested, or forfeited during the year. + References No definition available. + Details
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