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Stock-Based Compensation Plans (Tables) | 12 Months Ended
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Dec. 31, 2018
Summary of Stock Option Activity | A summary of stock option activity under the various stock incentive plans previously described 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, December 31, 2017 |  |  | 6,162,717 |  |  | $ | 16.83 |  |  |  |  |  |  |  |  |
Granted |  |  | 170,455 |  |  |  | 23.36 |  |  |  |  |  |  |  |  |
Exercised |  |  | (1,379,704 | ) |  |  | 14.26 |  |  |  |  |  |  |  |  |
Forfeited |  |  | (88,632 | ) |  |  | 18.56 |  |  |  |  |  |  |  |  |
Outstanding, December 31, 2018 |  |  | 4,864,836 |  |  | $ | 17.76 |  |  |  | 6.09 |  |  | $ | 48,214,530 |
Exercisable, December 31, 2018 |  |  | 3,416,715 |  |  | $ | 17.04 |  |  |  | 5.43 |  |  | $ | 36,309,807 |
Summary of Nonvested Restricted Share Awards | A summary of nonvested RSAs are as follows:
Nonvested Restricted Share Awards |  | Number of Shares |  |  | Weighted- Average Grant Date Fair Value |
Nonvested at December 31, 2017 |  |  | 503,237 |  |  | $ | 20.63 |
Vested |  |  | (231,473 | ) |  |  | 21.20 |
Forfeited |  |  | (58,427 | ) |  |  | 19.92 |
Nonvested at December 31, 2018 |  |  | 213,337 |  |  | $ | 20.21 |
Black-Scholes Option-Pricing Model [Member] |
Summary of Grant Date Fair Value Weighted-Average Assumptions, Options | The fair value of options granted in the respective fiscal years are estimated on the date of grant using the Black-Scholes option-pricing model, acceptable under ASC 718, with the following weighted-average assumptions:
|  | Years Ended December 31, |
|  | 2018 |  |  | 2017 |  |  | 2016 |
Expected life (years) |  |  | 5.6 |  |  |  | 5.6 |  |  |  | 5.9 |
Risk-free interest rate |  |  | 2.7 | % |  |  | 1.9 | % |  |  | 1.2 | %
Expected volatility |  |  | 26.4 | % |  |  | 29.4 | % |  |  | 29.7 | %
Expected dividend yield |  |  | — |  |  |  | — |  |  |  | — |
Monte Carlo Simulation Model [Member] |
Summary of Grant Date Fair Value Weighted-Average Assumptions, Options | With respect to supplemental stock options granted that vest based on the achievement of certain market conditions, the grant date fair value was estimated using a Monte Carlo simulation model with the following weighted-average assumptions:
|  | Year Ended |
|  | December 31, 2016 |
Expected life (years) |  |  | 7.5 |
Risk-free interest rate |  |  | 1.6 | %
Expected volatility |  |  | 41.6 | %
Expected dividend yield |  |  | — |
LTIP Performance Shares [Member] |
Summary of Nonvested Performance Award Activity | A summary of the nonvested LTIP performance shares are as follows:
Nonvested LTIP Performance Shares |  | Number of Shares at Expected Attainment |  |  | Weighted- Average Grant Date Fair Value |
Nonvested at December 31, 2017 |  |  | 1,125,035 |  |  | $ | 18.94 |
Forfeited |  |  | (93,147 | ) |  |  | 19.26 |
Change in expected attainment for 2016 grants |  |  | (491,191 | ) |  |  | 17.91 |
Nonvested at December 31, 2018 |  |  | 540,697 |  |  | $ | 19.83 |
Total Shareholder Return Awards (TSRs) [Member] |
Summary of Nonvested Performance Award Activity | A summary of nonvested TSRs are as follows:
Nonvested Total Shareholder Return Awards |  | Number of Shares at Expected Attainment |  |  | Weighted- Average Grant Date Fair Value |
Nonvested as of December 31, 2017 |  |  | 143,649 |  |  | $ | 24.37 |
Granted |  |  | 541,214 |  |  |  | 31.31 |
Forfeited |  |  | (42,855 | ) |  |  | 30.19 |
Change in attainment |  |  | 76,923 |  |  |  | 24.37 |
Nonvested as of December 31, 2018 |  |  | 718,931 |  |  | $ | 29.25 |
Total Shareholder Return Awards (TSRs) [Member] | Monte Carlo Simulation Model [Member] |
Summary of Nonvested Performance Award Activity | The grant date fair value of the TSRs was estimated using the following weighted-average assumptions:
|  | Years Ended December 31, |
|  | 2018 |  |  | 2017 |
Expected life (years) |  |  | 2.9 |  |  |  | 2.9 |
Interest rate |  |  | 2.4 | % |  |  | 1.5 | %
Volatility |  |  | 28.0 | % |  |  | 26.5 | %
Dividend Yield |  |  | — |  |  |  | — |
Performance-Based Restricted Share Awards (PBRSAs) [Member] |
Summary of Nonvested Performance Award Activity |
Nonvested Performance-Based Restricted Share Awards |  | Number of Shares |  |  | Weighted- Average Grant Date Fair Value |
Nonvested as of December 31, 2017 |  |  | 173,636 |  |  | $ | 24.41 |
Vested |  |  | (173,636 | ) |  |  | 24.41 |
Nonvested as of December 31, 2018 |  |  | — |  |  | $ | — |
Restricted Share Units (RSUs) [Member] |
Summary of Nonvested Restricted Share Unit Activity | A summary of nonvested RSUs are as follows:
Nonvested Restricted Share Units |  | Number of Shares |  |  | Weighted- Average Grant Date Fair Value |
Nonvested as of December 31, 2017 |  |  | — |  |  | $ | — |
Granted |  |  | 714,123 |  |  |  | 23.81 |
Vested |  |  | (10,000 | ) |  |  | 25.72 |
Forfeited |  |  | (53,078 | ) |  |  | 23.36 |
Nonvested as of December 31, 2018 |  |  | 651,045 |  |  | $ | 23.82 |

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