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Stock-Based Compensation Plans (Tables) | 6 Months Ended
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Jun. 30, 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 |  |  | (608,157 | ) |  |  | 13.07 |  |  |  |  |  |  |  |  |
Forfeited |  |  | (186,190 | ) |  |  | 18.50 |  |  |  |  |  |  |  |  |
Expired |  |  | (17,507 | ) |  |  | 20.36 |  |  |  |  |  |  |  |  |
Outstanding as of June 30, 2017 |  |  | 6,844,321 |  |  | $ | 16.25 |  |  |  | 6.80 |  |  | $ | 41,895,512 |
Exercisable as of June 30, 2017 |  |  | 4,086,269 |  |  | $ | 14.50 |  |  |  | 5.50 |  |  | $ | 32,153,661 |
Summary of Nonvested Restricted Share Awards and Changes During Period | A summary of nonvested restricted share awards (“RSAs”) as of June 30, 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 |  |  | 560,174 |  |  |  | 20.61 |
Vested |  |  | (113,693 | ) |  |  | 20.86 |
Forfeited |  |  | (46,367 | ) |  |  | 20.47 |
Nonvested as of June 30, 2017 |  |  | 572,222 |  |  | $ | 20.57 |
Black-Scholes Option-Pricing Model [Member] |
Estimated Fair Value of Options Granted Pricing Model with Weighted-Average Assumptions | For options that do not vest based on the achievement of certain market conditions the grant date fair values 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:
|  | Six Months Ended June 30, 2017 |  |  | Six Months Ended June 30, 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:
|  | Six Months Ended June 30, 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 June 30, 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 |  |  | (115,365 | ) |  |  | 18.60 |
Nonvested as of June 30, 2017 |  |  | 2,176,240 |  |  | $ | 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:
|  | Six Months Ended June 30, 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 June 30, 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 |
Forfeited |  |  | (8,624 | ) |  |  | 24.37 |
Nonvested as of June 30, 2017 |  |  | 224,453 |  |  | $ | 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 June 30, 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 |  |  | (484,835 | ) |  |  | 22.82 |
Forfeited |  |  | (11,604 | ) |  |  | 23.84 |
Change in attainment for 2015 grants |  |  | (13,592 | ) |  |  | 23.25 |
Nonvested as of June 30, 2017 |  |  | 173,636 |  |  | $ | 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 June 30, 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 June 30, 2017 |  |  | 53,669 |  |  | $ | 17.89 |
Restricted share awards (RSAs) [Member] | PAY.ON [Member] |
Summary of Nonvested Restricted Share Awards and Changes During Period | A summary of nonvested PAY.ON RSAs as of June 30, 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 |
Vested |  |  | (59,594 | ) |  |  | 23.60 |
Nonvested at June 30, 2017 |  |  | 59,594 |  |  | $ | 23.60 |

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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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 Reference 3: 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=96867065&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=96867065&loc=d3e5070-113901 + Details
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