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Stock-Based Compensation (Tables) | 12 Months Ended
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Dec. 31, 2020
Share-based Payment Arrangement [Abstract] |
Summary of restricted stock, restricted stock unit and stock option activity | The following table summarizes RSU, restricted stock and stock option activity:
| RSU or Restricted Stock | Stock Options
| Number | Weighted Average Grant Date Fair Value Per Share | Number | Weighted Average Exercise Price Per Share
Outstanding as of December 31, 2017 | 933,464 |  | $51.85 | 5,069,956 |  | $60.08
Granted | 603,111 |  | 57.88 | 33,615 |  | 58.15
Forfeited or expired | (38,365) |  | 54.07 | (352,624) |  | 64.64
Vested/exercised | (513,078) |  | 51.58 | (161,562) |  | 44.92
Outstanding as of December 31, 2018 | 985,132 |  | $53.78 | 4,589,385 |  | $60.25
Granted | 1,356,303 |  | 32.68 | 1,192,108 |  | 22.47
Forfeited or expired | (173,604) |  | 39.57 | (351,885) |  | 60.56
Vested/exercised | (507,520) |  | 47.72 | (48,131) |  | 30.46
Outstanding as of December 31, 2019 | 1,660,311 |  | $39.88 | 5,381,477 |  | $52.13
Granted | 1,355,975 |  | 10.30 | 975,290 |  | 11.06
Forfeited or expired | (114,352) |  | 33.74 | (603,835) |  | 59.46
Vested/exercised | (643,340) |  | 42.23 | — |  | —
Outstanding as of December 31, 2020 | 2,258,594 |  | $21.76 | 5,752,932 |  | $44.40
Options exercisable as of December 31, 2020 |  |  | 3,784,647 |  | $58.80
Remaining unvested options outstanding and expected to vest |  |  | 1,948,602 |  | $16.72
During 2020, the following units were granted:
| Performance-based Award Units Granted in 2020 | Weighted Average Grant Date Fair Value Per Share
2020 Performance Award Plan | 385,455 | $9.05
2019 Performance Award Plan | 116,844 | $9.77
2018 Performance Award Plan | 68,866 | $10.75
Schedule of fair value on grant date and significant assumptions used in Black-Scholes option-pricing model | The grant date fair value of options and other significant assumptions follow:
| January 1 - November 30, 2020 | December 31, 2020 | January 1 - September 30, 2019 | October 1 - December 31, 2019 | 2018
Weighted average grant date fair value | $4.59 | $9.05 | $7.99 | $6.93 | $14.87
Expected life of options (in years) | 4.6 | 7.2 | 5.6 | 5.4 | 5.3
Risk-free interest rate | 0.4 | % | 0.5 | % | 2.6 | % | 1.7 | % | 2.7 | %
Expected volatility | 64.9 | % | 60.8 | % | 33.3 | % | 46.6 | % | 28.2 | %
Expected annual dividend per share | $0.00 | $0.00 | $0.84 | $0.40 | $0.84
Summary of information related to options outstanding | Information related to options outstanding as of December 31, 2020 follows:
| Options Outstanding |  | Options Exercisable
Range of Exercise Prices | Number Outstanding | Weighted Average Remaining Contractual Life (In Years) | Weighted Average Exercise Price Per Share |  | Number Exercisable | Weighted Average Remaining Contractual Life (In Years) | Weighted Average Exercise Price Per Share
$8.81 - $29.50 | 2,088,027 |  | 9.2 | $ | 17.27 |  |  | 130,947 |  | 8.4 | $ | 29.03 |
$46.07 - $62.50 | 3,054,457 |  | 4.4 | 56.48 |  |  | 3,043,252 |  | 4.4 | 56.47 |
$70.76 - $79.19 | 610,448 |  | 2.3 | 76.77 |  |  | 610,448 |  | 2.3 | 76.77 |
| 5,752,932 |  | 5.9 | $ | 44.40 |  |  | 3,784,647 |  | 4.2 | $ | 58.80 |

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- Definition Tabular disclosure of activity for award under share-based payment arrangement. Includes, but is not limited to, outstanding award at beginning and end of year, granted, exercised, forfeited, 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 (e) -URI http://asc.fasb.org/extlink&oid=120381028&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 (c)(2) -URI http://asc.fasb.org/extlink&oid=120381028&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 (d) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of option exercise prices, by grouped ranges, including the upper and lower limits of the price range, the number of shares under option, weighted average exercise price and remaining contractual option terms. + 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 -URI http://asc.fasb.org/extlink&oid=120381028&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=120381028&loc=d3e5070-113901 + Details
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