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Accounting for Stock-based Compensation (Tables) | 12 Months Ended
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Dec. 31, 2018
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |
Schedule of Stock-based Compensation Expense | The total stock-based compensation expense for the years ended December 31, 2018, 2017, and 2016, the unrecognized compensation expense at December 31, 2018, and the weighted-average period to recognize the remaining unrecognized shares are as follows:
|  | Stock-Based Compensation Expense |
|  | Recognized as of December 31, |  |  | Unrecognized |
|  | 2018 |  |  | 2017 |  |  | 2016 |  |  | December 31, 2018 |  |  | Weighted-Average Period to Recognize (years) |
Stock Options |  | $ | — |  |  | $ | 164 |  |  | $ | 909 |  |  | $ | — |  |  |  | — |
Restricted Stock Units |  |  | 7,410 |  |  |  | 7,080 |  |  |  | 6,325 |  |  |  | 13,484 |  |  |  | 1.8 |
Cash-Settled Restricted Stock Units |  |  | 8,214 |  |  |  | 7,253 |  |  |  | 7,091 |  |  |  | 10,550 |  |  |  | 1.6 |
Non-Employee Director Awards |  |  | 764 |  |  |  | 671 |  |  |  | 741 |  |  |  | 327 |  |  |  | 0.4 |
Performance Shares |  |  | 3,193 |  |  |  | 2,376 |  |  |  | 877 |  |  |  | 3,000 |  |  |  | 1.5 |
Total |  | $ | 19,581 |  |  | $ | 17,544 |  |  | $ | 15,943 |  |  | $ | 27,361 |  |  |  |  |
Outstanding Stock Option Activity | The following table summarizes the changes in outstanding stock options:
|  | Number of Shares |  |  | Weighted Average Exercise Price |  |  | Aggregate Intrinsic Value |
Outstanding at January 1, 2016 |  |  | 723,005 |  |  | $ | 28.62 |  |  |  |  |
Exercised |  |  | (128,301 | ) |  | $ | 23.65 |  |  |  |  |
Granted |  | — |  |  | $ | — |  |  |  |  |
Forfeited/Expired |  |  | (7,297 | ) |  | $ | 40.68 |  |  |  |  |
Outstanding at December 31, 2016 |  |  | 587,407 |  |  | $ | 29.56 |  |  |  |  |
Exercised |  |  | (175,909 | ) |  | $ | 26.84 |  |  |  |  |
Granted |  |  | — |  |  | $ | — |  |  |  |  |
Forfeited/Expired |  |  | — |  |  | $ | — |  |  |  |  |
Outstanding at December 31, 2017 |  |  | 411,498 |  |  | $ | 30.71 |  |  |  |  |
Exercised |  |  | (209,688 | ) |  | $ | 27.86 |  |  |  |  |
Granted |  |  | — |  |  | $ | — |  |  |  |  |
Forfeited/Expired |  |  | — |  |  | $ | — |  |  |  |  |
Outstanding at December 31, 2018 |  |  | 201,810 |  |  | $ | 33.68 |  |  | $ | 6,276,432 |
Vested plus expected to vest at December 31, 2018 |  |  | 201,810 |  |  | $ | 33.68 |  |  | $ | 6,276,432 |
Exercisable at December 31, 2018 |  |  | 201,810 |  |  | $ | 33.68 |  |  | $ | 6,276,432 |
Schedule of Stock Options Outstanding by Exercise Price Range | Information regarding stock options outstanding as of December 31, 2018 is summarized below:
|  | OPTIONS OUTSTANDING |  |  | OPTIONS EXERCISABLE |
Range of Exercise Prices |  | Number Outstanding As of December 31, 2018 |  |  | Weighted Average Remaining Contractual Term |  |  | Weighted Average Exercise Price |  |  | Number Exercisable As of December 31, 2018 |  |  | Weighted Average Exercise Price |
$21.77 to $25.00 |  |  | 1,915 |  |  |  | 2.3 |  |  | $ | 21.77 |  |  |  | 1,915 |  |  | $ | 21.77 |
$25.01 to $28.00 |  |  | 100,114 |  |  |  | 4.1 |  |  | $ | 26.93 |  |  |  | 100,114 |  |  | $ | 26.93 |
$28.01 to $40.68 |  |  | 99,781 |  |  |  | 5.2 |  |  | $ | 40.68 |  |  |  | 99,781 |  |  | $ | 40.68 |
$21.77 to $41.00 |  |  | 201,810 |  |  |  | 4.7 |  |  | $ | 33.68 |  |  |  | 201,810 |  |  | $ | 33.68 |
Summary of Non-employee Director Awards | A summary of the Company’s non-employee director awards of unregistered shares granted by fiscal year is presented below.
For the Year ended December 31, |  | Number of shares Granted |  |  | Weighted- Average Grant Date Fair Value |
2016 |  |  | 15,299 |  |  | $ | 39.32 |
2017 |  |  | 13,861 |  |  | $ | 48.41 |
2018 |  |  | 7,985 |  |  | $ | 60.36 |
On July 2, 2018, the Company granted awards of registered shares to its non-employee directors on an annual basis under the Omnibus Plan. A summary of the non-employee director awards is presented below:
|  | Number of Shares |  |  | Weighted-Average Grant Date Fair Value |  |  | Aggregate Intrinsic Value |
Non-vested RSAs at January 1, 2018 |  |  | — |  |  | $ | — |  |  |  |  |
Granted |  |  | 11,606 |  |  | $ | 72.35 |  |  |  |  |
Vested |  |  | (5,395 | ) |  | $ | 72.35 |  |  |  |  |
Cancelled |  |  | (1,243 | ) |  | $ | 72.35 |  |  |  |  |
Non-vested RSAs at December 31, 2018 |  |  | 4,968 |  |  | $ | 72.35 |  |  | $ | 321,827 |
RSAs expected to vest in the future |  |  | 4,968 |  |  | $ | 72.35 |  |  | $ | 321,827 |
Summary of Performance Shares Activity | A summary of the Company’s PSAs is presented below.
|  | Number of Shares |  |  | Weighted-Average Grant Date Fair Value |  |  | Aggregate Intrinsic Value |
Non-vested PSAs at January 1, 2016 |  |  | 58,822 |  |  | $ | 44.21 |  |  |  |  |
Granted |  |  | 74,574 |  |  | $ | 37.75 |  |  |  |  |
Vested |  |  | — |  |  | $ | — |  |  |  |  |
Cancelled |  |  | (3,422 | ) |  | $ | 41.61 |  |  |  |  |
Non-vested PSAs at December 31, 2016 |  |  | 129,974 |  |  | $ | 40.57 |  |  |  |  |
Granted |  |  | 60,929 |  |  | $ | 38.81 |  |  |  |  |
Vested |  |  | — |  |  | $ | — |  |  |  |  |
Cancelled |  |  | (3,881 | ) |  | $ | 42.83 |  |  |  |  |
Non-vested PSAs at December 31, 2017 |  |  | 187,022 |  |  | $ | 39.95 |  |  |  |  |
Granted |  |  | 45,136 |  |  | $ | 65.05 |  |  |  |  |
Vested |  |  | (30,576 | ) |  | $ | 44.21 |  |  |  |  |
Cancelled |  |  | (32,096 | ) |  | $ | 43.72 |  |  |  |  |
Non-vested PSAs at December 31, 2018 |  |  | 169,486 |  |  | $ | 45.15 |  |  | $ | 10,979,303 |
PSAs expected to vest in the future |  |  | 97,309 |  |  | $ | 50.35 |  |  | $ | 6,303,674 |
Restricted Stock Units (RSUs) |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |
Schedule of Restricted Stock Unit Activity | A summary of the Company’s RSUs is presented below.
|  | Number of Shares |  |  | Weighted- Average Grant Date Fair Value |  |  | Aggregate Intrinsic Value |
Non-vested RSUs at January 1, 2016 |  |  | 555,904 |  |  | $ | 35.40 |  |  |  |  |
Granted |  |  | 240,868 |  |  | $ | 34.68 |  |  |  |  |
Vested |  |  | (221,659 | ) |  | $ | 32.45 |  |  |  |  |
Cancelled |  |  | (67,115 | ) |  | $ | 37.60 |  |  |  |  |
Non-vested RSUs at December 31, 2016 |  |  | 507,998 |  |  | $ | 36.12 |  |  |  |  |
Granted |  |  | 194,227 |  |  | $ | 41.41 |  |  |  |  |
Vested |  |  | (179,974 | ) |  | $ | 35.19 |  |  |  |  |
Cancelled |  |  | (58,664 | ) |  | $ | 36.04 |  |  |  |  |
Non-vested RSUs at December 31, 2017 |  |  | 463,587 |  |  | $ | 38.71 |  |  |  |  |
Granted |  |  | 235,480 |  |  | $ | 65.37 |  |  |  |  |
Vested |  |  | (169,279 | ) |  | $ | 38.66 |  |  |  |  |
Cancelled |  |  | (54,742 | ) |  | $ | 47.50 |  |  |  |  |
Non-vested RSUs at December 31, 2018 |  |  | 475,046 |  |  | $ | 50.93 |  |  | $ | 30,773,480 |
RSUs expected to vest in the future |  |  | 425,272 |  |  | $ | 49.77 |  |  | $ | 27,549,127 |
Cash Settled RSUs |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |
Schedule of Restricted Stock Unit Activity | CSRSUs generally have a vesting term of three to four years. A summary of the Company’s CSRSUs is presented below.
|  | Number of Shares |  |  | Weighted- Average Grant Date Fair Value |  |  | Aggregate Intrinsic Value |
Non-vested CSRSUs at January 1, 2016 |  |  | 446,663 |  |  | $ | 37.18 |  |  |  |  |
Granted |  |  | 233,790 |  |  | $ | 34.29 |  |  |  |  |
Vested |  |  | (146,619 | ) |  | $ | 34.70 |  |  |  |  |
Cancelled |  |  | (70,812 | ) |  | $ | 37.55 |  |  |  |  |
Non-vested CSRSUs at December 31, 2016 |  |  | 463,022 |  |  | $ | 35.96 |  |  |  |  |
Granted |  |  | 174,419 |  |  | $ | 42.06 |  |  |  |  |
Vested |  |  | (161,576 | ) |  | $ | 40.78 |  |  |  |  |
Cancelled |  |  | (83,949 | ) |  | $ | 36.43 |  |  |  |  |
Non-vested CSRSUs at December 31, 2017 |  |  | 391,916 |  |  | $ | 38.80 |  |  |  |  |
Granted |  |  | 147,103 |  |  | $ | 60.84 |  |  |  |  |
Vested |  |  | (147,759 | ) |  | $ | 38.71 |  |  |  |  |
Cancelled |  |  | (51,695 | ) |  | $ | 43.07 |  |  |  |  |
Non-vested CSRSUs at December 31, 2018 |  |  | 339,565 |  |  | $ | 47.73 |  |  | $ | 21,997,021 |
CSRSUs expected to vest in the future |  |  | 301,532 |  |  | $ | 47.00 |  |  | $ | 19,533,238 |

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