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Stock-Based Compensation Plans (Tables) | 3 Months Ended
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Mar. 31, 2017
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, 2016 |  |  | 6,791,375 |  |  | $ | 15.54 |  |  |  |  |  |  |  |  |
Granted |  |  | 864,800 |  |  |  | 20.12 |  |  |  |  |  |  |  |  |
Exercised |  |  | (529,697 | ) |  |  | 13.28 |  |  |  |  |  |  |  |  |
Forfeited |  |  | (103,751 | ) |  |  | 18.12 |  |  |  |  |  |  |  |  |
Expired |  |  | (14,783 | ) |  |  | 20.42 |  |  |  |  |  |  |  |  |
Outstanding as of March 31, 2017 |  |  | 7,007,944 |  |  | $ | 16.23 |  |  |  | 7.07 |  |  | $ | 36,159,173 |
Exercisable as of March 31, 2017 |  |  | 4,167,453 |  |  | $ | 14.45 |  |  |  | 5.78 |  |  | $ | 28,920,839 |
Summary of Nonvested Restricted Share Awards and Changes During Period | A summary of nonvested restricted share awards (“RSAs”) as of March 31, 2017 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, 2016 |  |  | 172,108 |  |  | $ | 20.62 |
Granted |  |  | 446,702 |  |  |  | 20.12 |
Forfeited |  |  | (18,182 | ) |  |  | 22.90 |
Nonvested as of March 31, 2017 |  |  | 600,628 |  |  | $ | 20.18 |
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 three months ended March 31, 2017 and 2016 were estimated on the date of grant using the Black-Scholes option-pricing model, a pricing model acceptable under U.S. GAAP, with the following weighted-average assumptions:
|  | Three Months Ended |  |  | Three Months Ended |
|  | March 31, 2017 |  |  | March 31, 2016 |
Expected life (years) |  |  | 5.6 |  |  |  | 5.9 |
Interest rate |  |  | 1.9 | % |  |  | 1.2 | %
Volatility |  |  | 29.4 | % |  |  | 29.7 | %
Dividend yield |  |  | — |  |  |  | — |
Monte Carlo Simulation [Member] |
Estimated Fair Value of Options Granted Pricing Model with Weighted-Average Assumptions | With respect to options granted that vest based on the achievement of certain market conditions, the grant date fair value of such options was estimated using the following weighted-average assumptions:
|  | Three Months Ended |
|  | March 31, 2016 |
Expected life (years) |  |  | 7.5 |
Interest rate |  |  | 1.6 | %
Volatility |  |  | 41.6 | %
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 March 31, 2017 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, 2016 |  |  | 1,738,056 |  |  | $ | 18.45 |
Granted |  |  | 553,549 |  |  |  | 20.12 |
Forfeited |  |  | (51,706 | ) |  |  | 18.24 |
Nonvested as of March 31, 2017 |  |  | 2,239,899 |  |  | $ | 18.87 |
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:
|  | Three Months Ended |
|  | March 31, 2017 |
Expected life (years) |  |  | 2.9 |
Interest rate |  |  | 1.5 | %
Volatility |  |  | 26.5 | %
Dividend Yield |  |  | — |
TSR Plan [Member] |
Summary of Nonvested Performance Share Awards and Changes During Period | A summary of nonvested TSRs outstanding as of March 31, 2017 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, 2016 |  |  | — |  |  | $ | — |
Granted |  |  | 233,077 |  |  |  | 24.37 |
Nonvested as of March 31, 2017 |  |  | 233,077 |  |  | $ | 24.37 |
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 March 31, 2017 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, 2016 |  |  | 683,667 |  |  | $ | 23.25 |
Vested |  |  | (305,136 | ) |  |  | 21.89 |
Forfeited |  |  | (5,536 | ) |  |  | 23.21 |
Change in attainment for 2015 grants |  |  | (13,592 | ) |  |  | 23.25 |
Nonvested as of March 31, 2017 |  |  | 359,403 |  |  | $ | 24.41 |
Retention RSAs [Member] |
Summary of Nonvested Restricted Share Awards and Changes During Period | A summary of nonvested Retention Restricted Share Awards (“Retention RSAs”) as of March 31, 2017 and changes during the period are as follows:
Nonvested Retention Restricted Share Awards |  | Number of Retention Restricted Share Awards |  |  | Weighted-Average Grant Date Fair Value |
Nonvested as of December 31, 2016 |  |  | 205,540 |  |  | $ | 17.89 |
Vested |  |  | (151,871 | ) |  |  | 17.89 |
Nonvested as of March 31, 2017 |  |  | 53,669 |  |  | $ | 17.89 |
Restricted share awards (RSAs) | PAY.ON |
Summary of Nonvested Restricted Share Awards and Changes During Period | A summary of nonvested PAY.ON RSAs as of March 31, 2017 and changes during the period are as follows:
Nonvested PAY.ON RSAs |  | Number of PAY.ON RSAs |  |  | Grant Date Fair Value |
Nonvested at December 31, 2016 |  |  | 238,376 |  |  | $ | 23.60 |
Forfeited |  |  | (119,188 | ) |  |  | 23.60 |
Nonvested at March 31, 2017 |  |  | 119,188 |  |  | $ | 23.60 |

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- Definition Tabular disclosure of the number and weighted-average exercise prices (or conversion ratios) for share options (or share units) that were outstanding at the beginning and end of the year, vested and expected to vest, exercisable or convertible at the end of the year, and the number of share options or share units that were granted, exercised or converted, forfeited, and expired during the year. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=6415400&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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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