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Stock-Based Compensation Plans (Tables) | 3 Months Ended
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Mar. 31, 2019
Summary of Stock Option Activity | A summary of stock option activity is as follows:
Stock Options |  | Number of Shares |  |  | Weighted- Average Exercise Price ($) |  |  | Weighted- Average Remaining Contractual Term (Years) |  |  | Aggregate Intrinsic Value of In-the-Money Options ($) |
Outstanding as of December 31, 2018 |  |  | 4,864,836 |  |  | $ | 17.76 |  |  |  |  |  |  |  |  |
Exercised |  |  | (313,282 | ) |  |  | 15.50 |  |  |  |  |  |  |  |  |
Forfeited |  |  | (3,496 | ) |  |  | 17.89 |  |  |  |  |  |  |  |  |
Outstanding as of March 31, 2019 |  |  | 4,548,058 |  |  | $ | 17.91 |  |  |  | 6.02 |  |  | $ | 68,018,687 |
Exercisable as of March 31, 2019 |  |  | 3,946,163 |  |  | $ | 17.58 |  |  |  | 5.80 |  |  | $ | 60,350,648 |
Summary of Nonvested Restricted Share Awards | A summary of nonvested restricted share awards (“RSAs”) is as follows:
Nonvested Restricted Share Awards |  | Number of Shares |  |  | Weighted- Average Grant Date Fair Value |
Nonvested as of December 31, 2018 |  |  | 213,337 |  |  | $ | 20.21 |
Vested |  |  | (98,769 | ) |  |  | 20.12 |
Forfeited |  |  | (3,975 | ) |  |  | 20.12 |
Nonvested as of March 31, 2019 |  |  | 110,593 |  |  | $ | 20.29 |
Black-Scholes Option-Pricing Model [Member] |
Summary of Grant Date Fair Value Weighted-Average Assumptions | The fair value of options granted during the three months ended March 31, 2018, were estimated on the date of grant using the Black-Scholes option-pricing model, acceptable under ASC 718, Compensation – Stock Compensation (“ASC 718”), with the following weighted-average assumptions:
|  | Three Months Ended |
|  | March 31, 2018 |
Expected life (years) |  |  | 5.6 |
Risk-free interest rate |  |  | 2.7 | %
Expected volatility |  |  | 26.4 | %
Expected dividend yield |  |  | — |
LTIP Performance Shares [Member] |
Summary of Nonvested Performance Award Activity | A summary of nonvested long-term incentive program performance share awards (“LTIP performance shares”) is as follows:
Nonvested LTIP Performance Shares |  | Number of Shares at Expected Attainment |  |  | Weighted- Average Grant Date Fair Value |
Nonvested as of December 31, 2018 |  |  | 540,697 |  |  | $ | 19.83 |
Forfeited |  |  | (1,036 | ) |  |  | 20.12 |
Nonvested as of March 31, 2019 |  |  | 539,661 |  |  | $ | 19.83 |
Total Shareholder Return Awards (TSRs) [Member] |
Summary of Nonvested Performance Award Activity | A summary of nonvested total shareholder return awards (“TSRs”) is as follows:
Nonvested Total Shareholder Return Awards |  | Number of Shares |  |  | Weighted- Average Grant Date Fair Value |
Nonvested as of December 31, 2018 |  |  | 718,931 |  |  | $ | 29.25 |
Granted |  |  | 436,674 |  |  |  | 47.90 |
Forfeited |  |  | (5,457 | ) |  |  | 31.31 |
Nonvested as of March 31, 2019 |  |  | 1,150,148 |  |  | $ | 36.32 |
Total Shareholder Return Awards (TSRs) [Member] | Monte Carlo Simulation Model [Member] |
Summary of Grant Date Fair Value Weighted-Average Assumptions | The fair value of TSRs granted during the three months ended March 31, 2019 and 2018, were estimated on the date of grant using the Monte Carlo simulation model, acceptable under ASC 718, using the following weighted-average assumptions:
|  | Three Months Ended March 31, |
|  | 2019 |  |  | 2018 |
Expected life (years) |  |  | 2.8 |  |  |  | 2.9 |
Risk-free interest rate |  |  | 2.5 | % |  |  | 2.4 | %
Expected volatility |  |  | 29.3 | % |  |  | 28.0 | %
Expected dividend yield |  |  | — |  |  |  | — |
Restricted Share Units (RSUs) [Member] |
Summary of Nonvested Restricted Share Unit Activity | A summary of nonvested restricted share unit awards (“RSUs”) is as follows:
Nonvested Restricted Share Units |  | Number of Shares |  |  | Weighted- Average Grant Date Fair Value |
Nonvested as of December 31, 2018 |  |  | 651,045 |  |  | $ | 23.82 |
Granted |  |  | 550,091 |  |  |  | 33.07 |
Vested |  |  | (173,547 | ) |  |  | 23.36 |
Forfeited |  |  | (8,346 | ) |  |  | 23.36 |
Nonvested as of March 31, 2019 |  |  | 1,019,243 |  |  | $ | 28.90 |

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- Definition Tabular disclosure of the significant assumptions used during the year to estimate the fair value of awards other than stock options, including, but not limited to: (a) expected term of share awards 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 No definition available. + 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=109197908&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=109197908&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=109197908&loc=d3e5070-113901 + Details
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