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Share-based Compensation (Tables) | 12 Months Ended
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Dec. 31, 2017
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Summary of share-based compensation expense | Share-based compensation expense was as follows:
For the years ended December 31, | 2017 |  | 2016 |  | 2015
Stock options, net of estimated forfeitures | $ | 50,753 |  |  | $ | 27,543 |  |  | $ | 23,120 |
Restricted stock awards | 14,035 |  |  | 10,528 |  |  | 11,000 |
Total non-cash stock compensation | 64,788 |  |  | 38,071 |  |  | 34,120 |
Deferred compensation arrangement | — |  |  | 738 |  |  | 4,901 |
Total | $ | 64,788 |  |  | $ | 38,809 |  |  | $ | 39,021 |
Summary of stock options activity | The following tables summarize the stock option activity and the assumptions used to record the related share-based compensation expense for the years ended December 31, 2017, 2016 and 2015:
|  | 2017 |  | 2016 |  | 2015
|  | Options | Weighted Average Exercise Price | Aggregate Intrinsic Value |  | Options | Weighted Average Exercise Price | Aggregate Intrinsic Value |  | Options | Weighted Average Exercise Price | Aggregate Intrinsic Value
Outstanding at January 1 |  | 10,928 |  | $ | 21.81 |  | $ | 4,350 |  |  | 11,427 |  | $ | 26.12 |  | $ | 20,339 |  |  | 10,919 |  | $ | 25.84 |  | $ | 48,851 |
Granted |  | 4,283 |  | $ | 19.01 |  |  |  | 303 |  | $ | 23.29 |  |  |  | 1,447 |  | $ | 26.72 |  |
Exercised |  | — |  | $ | — |  | $ | — |  |  | (245 | ) | $ | 19.57 |  | $ | 899 |  |  | (460 | ) | $ | 18.76 |  | $ | 3,365 |
Forfeited or expired |  | (5,308 | ) | $ | 18.34 |  |  |  | (557 | ) | $ | 23.78 |  |  |  | (479 | ) | $ | 28.52 |  |
Outstanding at December 31 |  | 9,903 |  | $ | 19.30 |  | $ | — |  |  | 10,928 |  | $ | 21.81 |  | $ | 4,350 |  |  | 11,427 |  | $ | 26.12 |  | $ | 20,339 |
Exercisable at December 31 |  | 8,606 |  | $ | 19.38 |  | $ | — |  |  | 9,004 |  | $ | 21.48 |  | $ | 4,350 |  |  | 8,293 |  | $ | 24.32 |  | $ | 20,328 |
Vested and expected to vest |  | 9,847 |  | $ | 19.31 |  | $ | — |  |  | 10,790 |  | $ | 21.79 |  | $ | 4,350 |  |  | 11,110 |  | $ | 26.08 |  | $ | 20,339 |
Summary of stock option plans, by exercise price range |
| Options Outstanding |  | Options Exercisable |  | Assumption Range*
Exercise Prices | Number of Shares | Weighted Average Remaining Contractual Terms (Years) |  | Number of Shares | Weighted Average Remaining Contractual Terms (Years) |  | Risk-Free Interest Rate | Expected Terms in Years | Expected Volatility
Year Ended December 31, 2017 |  |  |  |  |  |  |  |  |
$14.58 - $19.56 | 6,500 |  | 4.58 |  | 5,549 |  | 4.22 |  | 0.33% - 3.31% | 2.03 -10.00 | 32.18% - 69.74%
$21.00 - $21.28 | 693 |  | 2.18 |  | 347 |  | 0.66 |  | 0.43% - 3.60% | 2.11 - 6.67 | 33.24% - 57.79%
$21.32 - $21.52 | 1,776 |  | 2.14 |  | 1,776 |  | 2.14 |  | 0.68% - 2.61% | 3.38 - 6.55 | 38.16% - 69.74%
$21.68 - $22.32 | 221 |  | 1.94 |  | 221 |  | 1.94 |  | 0.57% - 3.03% | 2.18 - 6.52 | 36.78% - 52.47%
$22.88 - $31.92 | 713 |  | 3.76 |  | 713 |  | 3.76 |  | 0.73% - 2.86% | 4.00 - 6.52 | 39.03% - 53.80%
Year Ended December 31, 2016 |  |  |  |  |  |  |  |  |
$18.36 - $19.56 | 3,601 |  | 0.80 |  | 3,601 |  | 0.80 |  | 0.32% - 4.20% | 1.90 - 6.95 | 26.85% - 52.47%
$20.16 - $21.28 | 353 |  | 1.66 |  | 353 |  | 1.66 |  | 0.42% - 3.60% | 2.11 - 6.52 | 33.24% - 52.47%
$21.48 - $21.52 | 438 |  | 3.81 |  | 438 |  | 3.81 |  | 0.68% - 2.63% | 3.38 - 6.58 | 38.16% - 52.47%
$21.68 - $22.32 | 320 |  | 3.10 |  | 320 |  | 3.10 |  | 0.57% - 3.03% | 2.18 - 6.52 | 36.78% - 52.47%
$22.40 - $31.92 | 6,216 |  | 7.07 |  | 4,291 |  | 6.71 |  | 0.73% - 2.86% | 4.00 - 7.12 | 39.03% - 58.84%
Year Ended December 31, 2015 |  |  |  |  |  |  |  |  |
$18.36 - $19.56 | 3,790 |  | 1.80 |  | 3,790 |  | 1.80 |  | 0.32% - 4.20% | 1.90 - 6.95 | 26.85% - 52.47%
$20.16 - $21.28 | 353 |  | 2.70 |  | 353 |  | 2.70 |  | 0.42% - 3.60% | 2.11 - 6.52 | 33.24% - 52.47%
$21.48 - $21.52 | 516 |  | 4.80 |  | 512 |  | 4.80 |  | 0.68% - 2.63% | 3.38 - 6.58 | 38.16% - 52.47%
$21.68 - $22.32 | 344 |  | 4.10 |  | 344 |  | 4.10 |  | 0.57% - 3.03% | 2.18 - 6.52 | 36.78% - 52.47%
$22.88 - $31.92 | 2,634 |  | 8.20 |  | 1,108 |  | 7.14 |  | 0.73% - 2.86% | 4.00 - 6.52 | 39.03% - 58.84%
$34.52 | 3,788 |  | 7.80 |  | 2,184 |  | 7.80 |  | 1.76% - 2.07% | 6.02 - 7.12 | 51.51% - 53.51%
* The expected dividend yield is zero for all options in all years.
Summary of non-vested restricted stock and restricted stock units activity | The following table summarizes the non-vested restricted stock and restricted stock units activity for the years ended December 31, 2017, 2016 and 2015:
|  | 2017 |  | 2016 |  | 2015
|  | Shares |  | Weighted Average Grant Date Fair Value |  | Shares |  | Weighted Average Grant Date Fair Value |  | Shares |  | Weighted Average Grant Date Fair Value
Non-vested at January 1 |  | 1,038 |  |  | $ | 25.97 |  |  | 865 |  |  | $ | 29.6 |  |  | 694 |  |  | $ | 32.48 |
Granted |  | 1,337 |  |  | $ | 16.65 |  |  | 655 |  |  | $ | 23.27 |  |  | 449 |  |  | $ | 26.28 |
Vested |  | (328 | ) |  | $ | 22.35 |  |  | (386 | ) |  | $ | 29.36 |  |  | (215 | ) |  | $ | 31.48 |
Forfeited |  | (397 | ) |  | $ | 23.33 |  |  | (96 | ) |  | $ | 26.51 |  |  | (63 | ) |  | $ | 31.08 |
Non-vested at December 31 |  | 1,650 |  |  | $ | 19.74 |  |  | 1,038 |  |  | $ | 25.97 |  |  | 865 |  |  | $ | 29.6 |

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