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Stock-Based Compensation Plans | 3 Months Ended
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Mar. 31, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
STOCK-BASED COMPENSATION PLANS | STOCK-BASED COMPENSATION PLANS The Company provides stock-based compensation benefits to employees and non-employee directors pursuant to its 2014 Long Term Incentive Plan (the "Incentive Plan"), as well as to employees pursuant to its Employee Stock Purchase Plan, as amended (the "Purchase Plan", formerly named the 1998 Employee Stock Purchase Plan). Long Term Incentive Plan The Incentive Plan provides for the grant of options (including options qualified as incentive stock options under the Internal Revenue Code of 1986 and options that are non-qualified), restricted stock, performance awards, bonus stock, and phantom stock to the Company's employees, consultants, non-employee directors and officers. The Incentive Plan expires on May 21, 2024. The terms of the awards (including vesting schedules) are established by the Compensation Committee of the Company’s Board of Directors. As of March 31, 2018, there were 878,454 shares available for issuance under the Incentive Plan. Restricted Stock Awards Under the Incentive Plan, the Company grants to non-employee directors and certain employees restricted stock awards or, at their election, restricted stock units (to non-employee directors only) at no cost to the recipient. Restricted stock awards qualify as participating securities because each award contains non-forfeitable rights to dividends. As such, the two-class method is required for the computation of earnings per share. See Note 6, "Earnings Per Share", for further details. Restricted stock awards are considered outstanding at the date of grant but are subject to vesting periods upon issuance of up to five years. Restricted stock units are considered vested at the time of issuance. However, since they convey no voting rights, they are not considered outstanding when issued. Restricted stock units settle in cash upon the termination of the grantees’ employment or directorship. In the event an employee or non-employee director terminates his or her employment or directorship with the Company prior to the lapse of the restrictions, the shares, in most cases, will be forfeited to the Company. The Company issues new shares or treasury shares, if available, when restricted stock vests. Compensation expense for restricted stock awards is calculated based on the market price of the Company’s common stock at the date of grant and recognized over the requisite service period. Forfeitures are estimated at the time of valuation and reduce expense ratably over the vesting period. This estimate is adjusted annually based on the extent to which actual or expected forfeitures differ from the previous estimate. A summary of the restricted stock awards as of March 31, 2018, along with the changes during the three months then ended, is as follows:
|  | Awards |  | Weighted Average Grant Date Fair Value
Nonvested at December 31, 2017 |  | 702,778 |  |  | $ | 68.23 |
Granted |  | 194,421 |  |  | 75.72 |
Vested |  | (167,934 | ) |  | 61.63 |
Forfeited |  | (14,180 | ) |  | 70.34 |
Nonvested at March 31, 2018 |  | 715,085 |  |  | $ | 71.78 |
Employee Stock Purchase Plan The Purchase Plan authorizes the issuance of up to 4.5 million shares of common stock and provides that no options to purchase shares may be granted under the Purchase Plan after May 19, 2025. The Purchase Plan is available to all employees of the Company and its participating subsidiaries and is a qualified plan as defined by Section 423 of the Internal Revenue Code. At the end of each fiscal quarter (the “Option Period”) during the term of the Purchase Plan, employees can acquire shares of common stock from the Company at 85% of the fair market value of the common stock on the first or the last day of the Option Period, whichever is lower. As of March 31, 2018, there were 1,102,825 shares available for issuance under the Purchase Plan. During the three months ended March 31, 2018 and 2017, the Company issued 36,270 and 30,154 shares, respectively, of common stock to employees participating in the Purchase Plan. With respect to shares issued under the Purchase Plan, the Company's Board of Directors has authorized specific share repurchases to fund the shares issuable under the Purchase Plan. The weighted average per share fair value of employee stock purchase rights issued pursuant to the Purchase Plan was $16.22 and $18.66 for the three months ended March 31, 2018 and 2017, respectively. The fair value of stock purchase rights is calculated using the grant date stock price, the value of the embedded call option and the value of the embedded put option. Stock-Based Compensation Total stock-based compensation cost was $5.6 million and $6.1 million for the three months ended March 31, 2018 and 2017, respectively. Cash received from Purchase Plan purchases was $2.0 million and $1.9 million for the three months ended March 31, 2018 and 2017, 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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 40 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=65895303&loc=d3e17540-113929 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 50 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=68057994&loc=d3e25284-112666 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 14) -URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5444-113901 + Details
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