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Stock-Based Compensation Plans (Tables) | 12 Months Ended
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Dec. 31, 2017
Summary of Stock Options Issued Pursuant to Stock Incentive Plans | A summary of stock options issued under the various Stock Incentive Plans previously described and changes 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, December 31, 2014 |  |  | 5,282,693 |  |  | $ | 12.06 |  |  |  |  |  |  |  |  |
Granted |  |  | 2,055,514 |  |  |  | 19.12 |  |  |  |  |  |  |  |  |
Exercised |  |  | (1,144,273 | ) |  |  | 10.62 |  |  |  |  |  |  |  |  |
Forfeited |  |  | (394,265 | ) |  |  | 19.06 |  |  |  |  |  |  |  |  |
Expired |  |  | (593 | ) |  |  | 20.51 |  |  |  |  |  |  |  |  |
Outstanding, December 31, 2015 |  |  | 5,799,076 |  |  |  | 14.37 |  |  |  |  |  |  |  |  |
Granted |  |  | 2,284,500 |  |  |  | 17.92 |  |  |  |  |  |  |  |  |
Exercised |  |  | (792,841 | ) |  |  | 11.69 |  |  |  |  |  |  |  |  |
Forfeited |  |  | (446,845 | ) |  |  | 18.69 |  |  |  |  |  |  |  |  |
Expired |  |  | (52,515 | ) |  |  | 20.44 |  |  |  |  |  |  |  |  |
Outstanding, December 31, 2016 |  |  | 6,791,375 |  |  |  | 15.54 |  |  |  |  |  |  |  |  |
Granted |  |  | 864,800 |  |  |  | 20.12 |  |  |  |  |  |  |  |  |
Exercised |  |  | (1,204,559 | ) |  |  | 11.52 |  |  |  |  |  |  |  |  |
Forfeited |  |  | (268,417 | ) |  |  | 18.43 |  |  |  |  |  |  |  |  |
Expired |  |  | (20,482 | ) |  |  | 20.11 |  |  |  |  |  |  |  |  |
Outstanding, December 31, 2017 |  |  | 6,162,717 |  |  | $ | 16.83 |  |  |  | 6.69 |  |  | $ | 35,976,295 |
Exercisable, December 31, 2017 |  |  | 3,486,892 |  |  | $ | 15.28 |  |  |  | 5.52 |  |  | $ | 25,770,089 |
Summary of Nonvested Restricted Share Awards and Changes During Period | A summary of nonvested RSAs are as follows:
Nonvested Restricted Share Awards |  | Number of Restricted Share Awards |  |  | Weighted-Average Grant Date Fair Value |
Nonvested at December 31, 2014 |  |  | 183,209 |  |  | $ | 17.11 |
Granted |  |  | 125,026 |  |  |  | 23.82 |
Vested |  |  | (158,973 | ) |  |  | 17.21 |
Nonvested at December 31, 2015 |  |  | 149,262 |  |  |  | 22.62 |
Granted |  |  | 148,322 |  |  |  | 20.19 |
Vested |  |  | (114,219 | ) |  |  | 22.64 |
Forfeited |  |  | (11,257 | ) |  |  | 21.01 |
Nonvested at December 31, 2016 |  |  | 172,108 |  |  |  | 20.62 |
Granted |  |  | 560,174 |  |  |  | 20.61 |
Vested |  |  | (120,869 | ) |  |  | 20.72 |
Forfeited |  |  | (108,176 | ) |  |  | 20.39 |
Nonvested at December 31, 2017 |  |  | 503,237 |  |  | $ | 20.63 |
Monte Carlo Simulation [Member] |
Estimated Fair Value of Options Granted Pricing Model with Weighted-Average Assumptions | Carlo simulation model is used. 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:
|  | Years Ended December 31, |
|  | 2016 |  |  | 2015 |
Expected life (years) |  |  | 7.5 |  |  |  | 7.5 |
Risk-free interest rate |  |  | 1.6 | % |  |  | 1.7 | %
Expected volatility |  |  | 41.6 | % |  |  | 41.9 | %
Expected dividend yield |  |  | — |  |  |  | — |
Black-Scholes Option-Pricing Model [Member] |
Estimated Fair Value of Options Granted Pricing Model with Weighted-Average Assumptions | 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, |
|  | 2017 |  |  | 2016 |  |  | 2015 |
Expected life (years) |  |  | 5.6 |  |  |  | 5.9 |  |  |  | 5.9 |
Risk-free interest rate |  |  | 1.9 | % |  |  | 1.2 | % |  |  | 1.4 | %
Expected volatility |  |  | 29.4 | % |  |  | 29.7 | % |  |  | 32.1 | %
Expected dividend yield |  |  | — |  |  |  | — |  |  |  | — |
TSR Plan [Member] |
Summary of Nonvested Performance Share Awards and Changes During Period | 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, 2016 |  |  | — |  |  | $ | — |
Granted |  |  | 233,077 |  |  |  | 24.37 |
Forfeited |  |  | (8,624 | ) |  |  | 24.37 |
Change in Attainment in 2017 |  |  | (80,804 | ) |  |  | 24.37 |
Nonvested as of December 31, 2017 |  |  | 143,649 |  |  | $ | 24.37 |
LTIP Performance Shares [Member] |
Summary of Nonvested Performance Share Awards and Changes During Period | 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, 2014 |  |  | 1,145,916 |  |  | $ | 14.84 |
Granted |  |  | 1,025,863 |  |  |  | 19.12 |
Vested |  |  | (548,671 | ) |  |  | 9.75 |
Forfeited |  |  | (205,510 | ) |  |  | 19.39 |
Change in expected attainment for 2011 and 2013 grants |  |  | (528,303 | ) |  |  | 19.44 |
Nonvested at December 31, 2015 |  |  | 889,295 |  |  |  | 19.13 |
Granted |  |  | 1,059,428 |  |  |  | 17.92 |
Forfeited |  |  | (210,667 | ) |  |  | 18.61 |
Nonvested at December 31, 2016 |  |  | 1,738,056 |  |  |  | 18.45 |
Granted |  |  | 553,549 |  |  |  | 20.12 |
Forfeited |  |  | (201,441 | ) |  |  | 18.87 |
Change in expected attainment for 2015 and 2016 grants |  |  | (965,129 | ) |  |  | 18.75 |
Nonvested at December 31, 2017 |  |  | 1,125,035 |  |  | $ | 18.94 |
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:
|  | Year Ended |
|  | December 31, 2017 |
Expected life (years) |  |  | 2.9 |
Interest rate |  |  | 1.5 | %
Volatility |  |  | 26.5 | %
Dividend Yield |  |  | — |
Performance-Based Restricted Share Awards [Member] |
Summary of Nonvested Performance Share Awards and Changes During Period | A summary of nonvested PBRSAs 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, 2014 |  |  | — |  |  | $ | — |
Granted |  |  | 978,365 |  |  |  | 23.45 |
Forfeited |  |  | (39,502 | ) |  |  | 24.24 |
Nonvested as of December 31, 2015 |  |  | 938,863 |  |  |  | 23.42 |
Forfeited |  |  | (67,397 | ) |  |  | 22.34 |
Vested |  |  | (169,567 | ) |  |  | 24.41 |
Change in attainment for 2015 grants |  |  | (18,232 | ) |  |  | 24.41 |
Nonvested as of December 31, 2016 |  |  | 683,667 |  |  |  | 23.25 |
Forfeited |  |  | (11,604 | ) |  |  | 23.84 |
Vested |  |  | (484,835 | ) |  |  | 22.82 |
Change in attainment for 2015 grants |  |  | (13,592 | ) |  |  | 23.25 |
Nonvested as of December 31, 2017 |  |  | 173,636 |  |  | $ | 24.41 |
Retention RSAs [Member] |
Summary of Nonvested Restricted Share Awards and Changes During Period | A summary of nonvested Retention RSAs 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, 2015 |  |  | — |  |  | $ | — |
Granted |  |  | 473,069 |  |  |  | 17.89 |
Vested |  |  | (226,526 | ) |  |  | 17.89 |
Forfeited |  |  | (41,003 | ) |  |  | 17.89 |
Nonvested as of December 31, 2016 |  |  | 205,540 |  |  |  | 17.89 |
Vested |  |  | (205,540 | ) |  |  | 17.89 |
Nonvested as of December 31, 2017 |  |  | — |  |  | $ | — |
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 are as follows:
Nonvested PAY.ON RSAs |  | Number of PAY.ON RSAs |  |  | Grant Date Fair Value |
Nonvested at December 31, 2014 |  |  | — |  |  | $ | — |
Granted |  |  | 476,750 |  |  |  | 23.60 |
Nonvested at December 31, 2015 |  |  | 476,750 |  |  |  | 23.60 |
Vested |  |  | (238,374 | ) |  |  | 23.60 |
Nonvested at December 31, 2016 |  |  | 238,376 |  |  |  | 23.60 |
Forfeited |  |  | (119,188 | ) |  |  | 23.60 |
Vested |  |  | (119,188 | ) |  |  | 23.60 |
Nonvested at December 31, 2017 |  |  | — |  |  | $ | — |

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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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