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Stock-BasedCompensation Plans | 6 Months Ended
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Jun. 30, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Stock-BasedCompensation Plans | 4. Stock-Based Compensation Plans Employee Stock Purchase Plan On April 6, 2017, the Board of Directors approved the 2017 Employee Stock Purchase Plan (“2017 ESPP”), which was approved by shareholders at the 2017 Annual Shareholder meeting. The 2017 ESPP provides employees with an opportunity to purchase shares of common stock in the Company. The 1999 Employee Stock Purchase Plan terminated upon the August 1, 2017 effective date of the 2017 ESPP. Under the Company’s 2017 ESPP a total of 3,000,000 shares of the Company’s common stock have been reserved for issuance to eligible employees. Participating employees are permitted to designate up to the lesser of $25,000 or 10% of their annual base compensation, for the purchase of common stock under the ESPP. Purchases under the ESPP are made one calendar month after the end of each fiscal quarter. The price for shares of common stock purchased under the ESPP is 85% of the stock’s fair market value on the last business day of the three-month participation period. Shares issued under the ESPP during the six months ended June 30, 2018 and 2017, totaled 77,118 and 84,294, respectively. Stock-Based Payments 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 |
The weighted-average grant date fair value of stock options granted during the six months ended June 30, 2018 and 2017 was $7.03 and $6.24, respectively. The Company issued treasury shares for the exercise of stock options during the six months ended June 30, 2018 and 2017. The total intrinsic value of stock options exercised during the six months ended June 30, 2018 and 2017 was $11.3 million and $5.5 million, respectively. 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 |  |  | — |  |  |  | — |
Expected volatilities are based on the Company’s historical common stock volatility derived from historical stock price data for historical periods commensurate with the options’ expected life. The expected life is the average number of years that the Company estimated that the options will be outstanding, based primarily on historical employee option exercise behavior. The risk-free interest rate is based on the implied yield currently available on United States Treasury zero coupon issues with a term equal to the expected term at the date of grant of the options. The expected dividend yield is zero as the Company has historically not paid dividends and does not anticipate dividends to be paid in the future. Long-term Incentive Program Performance Share Awards 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 |
Restricted Share Awards 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 |
During the six months ended June 30, 2018, a total of 229,625 RSA shares vested. The Company withheld 41,973 of those shares to pay the employees’ portion of the minimum payroll withholding taxes. Performance-Based Restricted Share Awards 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 |  |  | — |  |  | $ | — |
During the six months ended June 30, 2018, a total of 173,636 PBRSA shares vested. The Company withheld 64,699 of those shares to pay the employees’ portion of the minimum payroll withholding taxes. Total Shareholder Return Awards During the six months ended June 30, 2018 and 2017, the Company granted total shareholder return (“TSR”) awards, pursuant to the 2016 Equity and Performance Incentive Plan. TSRs are performance shares that are earned, if at all, based upon the Company’s total shareholder return as compared to a group of peer companies over a three-year performance period. The award payout can range from 0% to 200%. In order to determine the grant date fair value of the TSRs, a Monte Carlo simulation model is used. The Company recognizes compensation expense for TSRs over a three-year performance period based on the grant date fair value. 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 |  |  | — |  |  |  | — |
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 Units During the six months ended June 30, 2018, the Company granted restricted share units (“RSUs”) awards, pursuant to the 2016 Equity and Performance Incentive Plan. The awards generally have requisite service periods of three years and vest in increments of 33% on the anniversary of the grant dates. Under each arrangement, stock is issued without direct cost to the employee on the vesting date. The Company estimates the fair value of the RSUs based upon the market price of the Company’s stock at the date of grant. The Company recognizes compensation expense for RSUs on a straight-line basis over the requisite service 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 |
During the six months ended June 30, 2018, a total of 10,000 RSU shares vested. As of June 30, 2018, there were unrecognized compensation costs of $16.6 million related to the TSRs, $14.8 million related to RSUs, $7.8 million related to the LTIP performance shares, $5.6 million related to nonvested stock options, and $4.3 million related to the nonvested RSAs, which the Company expects to recognize over weighted-average periods of 2.5 years, 2.1 years, 1.5 years, 1.0 years, and 1.6 years, respectively. The Company recorded stock-based compensation expenses recognized under ASC 718, Compensation – Stock Compensation, for the three months ended June 30, 2018 and 2017, related to stock options, LTIP performance shares, RSAs, PBRSAs, TSR shares, RSUs, and the ESPP of $7.7 million and $8.3 million, respectively, with corresponding tax benefits of $1.2 million and $2.8 million, respectively. The Company recorded stock-based compensation, for the six months ended June 30, 2018 and 2017, of $14.1 million and $14.6 million, respectively, with corresponding tax benefits of $2.2 million and $5.0 million, respectively.

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- Definition The entire disclosure for compensation-related costs for equity-based compensation, which may include disclosure of policies, compensation plan details, allocation of equity compensation, incentive distributions, equity-based arrangements to obtain goods and services, deferred compensation arrangements, employee stock ownership plan details and employee stock purchase plan details. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -URI http://asc.fasb.org/topic&trid=2228938 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 50 -URI http://asc.fasb.org/subtopic&trid=2208855 + Details
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