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Stock-BasedCompensation Plans (Tables) | 6 Months Ended
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Jun. 30, 2018
Summary of Stock Options Issued Pursuant to Stock Incentive Plans | A summary of stock options issued pursuant to the Company’s stock incentive plans is as follows:
|  | 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, 2017 |  |  | 6,162,717 |  |  | $ | 16.83 |  |  |  |  |  |  |  |  |
Granted |  |  | 170,455 |  |  |  | 23.36 |  |  |  |  |  |  |  |  |
Exercised |  |  | (1,050,518 | ) |  |  | 14.19 |  |  |  |  |  |  |  |  |
Forfeited |  |  | (52,827 | ) |  |  | 19.02 |  |  |  |  |  |  |  |  |
Outstanding as of June 30, 2018 |  |  | 5,229,827 |  |  | $ | 17.55 |  |  |  | 6.40 |  |  | $ | 37,215,726 |
Exercisable as of June 30, 2018 |  |  | 3,688,160 |  |  | $ | 16.78 |  |  |  | 5.69 |  |  | $ | 29,089,836 |
Black-Scholes Option-Pricing Model [Member] |
Estimated Fair Value of Options Granted Pricing Model with Weighted-Average Assumptions | The fair value of options that do not vest based on the achievement of certain market conditions granted during the six months ended June 30, 2018 and 2017 were estimated on the date of grant using the Black-Scholes option-pricingmodel, a pricing model acceptable under U.S. GAAP, with the following weighted-average assumptions:
|  | Six Months Ended June 30, 2018 |  |  | Six Months Ended June 30, 2017 |
Expected life (years) |  |  | 5.6 |  |  |  | 5.6 |
Interest rate |  |  | 2.7 | % |  |  | 1.9 | %
Volatility |  |  | 26.4 | % |  |  | 29.4 | %
Dividend yield |  |  | — |  |  |  | — |
Total Shareholder Return [Member] | Monte Carlo Simulation [Member] |
Estimated Fair Value of Options Granted Pricing Model with Weighted-Average Assumptions | The grant date fair value of the TSRs was estimated using the following weighted-average assumptions:
|  | Six Months Ended June 30, 2018 |  |  | Six Months Ended June 30, 2017 |
Expected life (years) |  |  | 2.9 |  |  |  | 2.9 |
Interest rate |  |  | 2.4 | % |  |  | 1.5 | %
Volatility |  |  | 28.0 | % |  |  | 26.5 | %
Dividend Yield |  |  | — |  |  |  | — |
LTIP Performance Shares [Member] |
Summary of Nonvested Performance Share Awards and Changes During Period | A summary of nonvested long-term incentive program performance share awards (“LTIP performance shares”) outstanding as of June 30, 2018, and changes during the period are as follows:
Nonvested LTIP Performance Shares |  | Number of Shares at Expected Attainment |  |  | Weighted- Average Grant Date Fair Value |
Nonvested as of December 31, 2017 |  |  | 1,125,035 |  |  | $ | 18.94 |
Forfeited |  |  | (44,120 | ) |  |  | 19.11 |
Nonvested as of June 30, 2018 |  |  | 1,080,915 |  |  | $ | 18.94 |
TSR Plan [Member] |
Summary of Nonvested Performance Share Awards and Changes During Period | A summary of nonvested TSRs outstanding as of June 30, 2018, and changes during the period 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 |  |  | (11,372 | ) |  |  | 27.10 |
Nonvested as of June 30, 2018 |  |  | 673,491 |  |  | $ | 29.90 |
Restricted Share Awards (RSAs) [Member] |
Summary of Nonvested Restricted Share and Changes During Period | A summary of nonvested restricted share awards (“RSAs”) as of June 30, 2018, and changes during the period are as follows:
Nonvested Restricted Share Awards |  | Number of Restricted Share Awards |  |  | Weighted-Average Grant Date Fair Value |
Nonvested as of December 31, 2017 |  |  | 503,237 |  |  | $ | 20.63 |
Vested |  |  | (229,625 | ) |  |  | 21.22 |
Forfeited |  |  | (15,945 | ) |  |  | 20.12 |
Nonvested as of June 30, 2018 |  |  | 257,667 |  |  | $ | 20.11 |
Performance-Based Restricted Share Awards [Member] |
Summary of Nonvested Performance Share Awards and Changes During Period | A summary of nonvested Performance-Based Restricted Share Awards (“PBRSAs”) as of June 30, 2018, and changes during the period are as follows:
Nonvested Performance-Based Restricted Share Awards |  | Number of Performance-Based Restricted Share Awards |  |  | Weighted-Average Grant Date Fair Value |
Nonvested as of December 31, 2017 |  |  | 173,636 |  |  | $ | 24.41 |
Vested |  |  | (173,636 | ) |  |  | 24.41 |
Nonvested as of June 30, 2018 |  |  | — |  |  | $ | — |
Restricted Share Units [Member] |
Summary of Nonvested Restricted Share and Changes During Period | A summary of nonvested RSUs as of June 30, 2018, and changes during the period are as follows:
Nonvested Restricted Share Units |  | Number of Restricted Share Units |  |  | Weighted- Average Grant Date Fair Value |
Nonvested as of December 31, 2017 |  |  | — |  |  | $ | — |
Granted |  |  | 709,168 |  |  |  | 23.78 |
Vested |  |  | (10,000 | ) |  |  | 25.72 |
Forfeited |  |  | (5,992 | ) |  |  | 23.36 |
Nonvested as of June 30, 2018 |  |  | 693,176 |  |  | $ | 23.76 |

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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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- 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=109197908&loc=d3e5070-113901 + Details
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