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Shareholders' Equity and Common Stock Equivalents | 12 Months Ended
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Dec. 31, 2019
Equity [Abstract] |
Shareholders' Equity and Common Stock Equivalents | Share Repurchase Program and Treasury Shares On September 30, 2015, the Board authorized a share repurchase program allowing repurchases of up to $50.0 million of HMEC's common stock, par value $0.001 (Program). The Program authorizes the repurchase of common shares in open market or privately negotiated transactions, from time to time, depending on market conditions. The Program does not have an expiration date and may be limited or terminated at any time without notice. During 2017, the Company repurchased 48,440 shares of its common stock, or 0.1% of the shares outstanding as of December 31, 2016, at an aggregate cost of $1.7 million, or an average price of $34.28 per share. During 2018, the Company repurchased 129,112 shares of its common stock, or 0.3% of the shares outstanding as of December 31, 2017, at an aggregate cost of $5.1 million, or an average price of $39.41 per share. During 2019, the Company did not repurchase any shares of its common stock. In total and through December 31, 2019, 2,977,162 shares were repurchased under the Program at an average price of $25.94 per share. The repurchase of shares was funded through use of cash. As of December 31, 2019, $22.8 million remained authorized for future share repurchases under the Program. At December 31, 2019, the Company held 24,850,484 shares in treasury. Authorization of Preferred Stock In 1996, the shareholders of HMEC approved authorization of 1,000,000 shares of $0.001 par value preferred stock. The Board is authorized to (1) direct the issuance of the preferred stock in one or more series, (2) fix the dividend rate, conversion or exchange rights, redemption price and liquidation preference, of any series of the preferred stock, (3) fix the number of shares for any series and (4) increase or decrease the number of shares of any series. No shares of preferred stock were issued or outstanding at December 31, 2019 and 2018. 2010 Comprehensive Executive Compensation Plan In 2010, the shareholders of HMEC approved the 2010 Comprehensive Executive Compensation Plan (the Comprehensive Plan). The purpose of the Comprehensive Plan is to aid the Company in attracting, retaining, motivating and rewarding employees and non-employee Directors; to provide for equitable and competitive compensation opportunities, including deferral opportunities; to encourage long-term service; to recognize individual contributions and reward achievement of Company goals; and to promote the creation of long-term value for the Company's shareholders by closely aligning the interests of plan participants with those of shareholders. The Comprehensive Plan authorizes share-based and cash-based incentives for plan participants. In 2012, the shareholders of HMEC approved the implementation of a fungible share pool under which grants of full value shares will count against the share limit as two and one half shares for every share subject to a full value award. In 2015, the shareholders of HMEC approved an amendment and restatement of the Comprehensive Plan which included an increase of 3,250,000 in the number of shares of common stock reserved for issuance under the Comprehensive Plan. As of December 31, 2019, approximately 1,187,200 shares were available for grant under the Comprehensive Plan. Shares of common stock issued under the Comprehensive Plan may be either authorized and unissued shares of HMEC or shares that have been reacquired by HMEC; however, new shares have been issued historically. As further described in the paragraphs below, CSUs, stock options and RSUs under the Comprehensive Plan were as follows:
|  | December 31,
|  | 2019 |  | 2018 |  | 2017
CSUs related to deferred compensation for Directors |  | 28,526 |  |  | 32,288 |  |  | 61,677 |
CSUs related to deferred compensation for employees |  | 25,194 |  |  | 24,498 |  |  | 24,903 |
Stock options |  | 908,557 |  |  | 774,821 |  |  | 719,015 |
RSUs related to incentive compensation |  | 889,438 |  |  | 1,008,249 |  |  | 1,149,679 |
Total |  | 1,851,715 |  |  | 1,839,856 |  |  | 1,955,274 |
Director Common Stock Units Deferred compensation for Directors is in the form of CSUs, which represent an equal number of common shares to be issued in the future. The outstanding units of Directors serving on the Board accrue dividends at the same rate as dividends paid to HMEC's shareholders. These dividends are reinvested into additional CSUs. Employee Common Stock Units Deferred compensation for employees is in the form of CSUs, which represent an equal number of common shares to be issued in the future. Distributions of employee deferred compensation are allowed to be either in common shares or cash. Through December 31, 2019, all distributions have been in cash. The outstanding units accrue dividends at the same rate as dividends paid to HMEC's shareholders. These dividends are reinvested into additional CSUs. Stock Options Options to purchase shares of HMEC common stock may be granted to executive officers, other employees and Directors. The options become exercisable in installments based on service generally beginning in the first year from the date of grant and generally become fully vested 4 years from the date of grant. The options generally expire 7 to 10 years from the date of grant. The exercise price of the option is equal to the market price of HMEC's common stock on the date of grant resulting in a grant date intrinsic value of $0. Changes in outstanding options were as follows:
|  | Weighted Average Option Price per Share |  | Range of Option Prices per Share |  | Options
|  |  |  | Outstanding |  | Vested and Exercisable
December 31, 2018 |  | $36.65 |  | $17.32-$44.75 |  | 774,821 |  |  | 271,116 |
Granted |  | $39.22 |  | $38.99-$42.73 |  | 282,040 |  |  | — |
Vested |  | $34.46 |  | $20.60-$44.75 |  | — |  |  | 161,679 |
Exercised |  | $26.98 |  | $17.32-$42.95 |  | (64,095 | ) |  | (64,095 | )
Forfeited |  | $39.97 |  | $31.01-$44.75 |  | (84,209 | ) |  | — |
Expired |  | — |  | — |  | — |  |  | — |
December 31, 2019 |  | $37.82 |  | $20.60-$44.75 |  | 908,557 |  |  | 368,700 |
Option information segregated by ranges of exercise prices were as follows:
|  | December 31, 2019
|  |  |  | Total Outstanding Options |  | Vested and Exercisable Options
|  | Range of Option Prices per Share |  | Options |  | Weighted Average Option Price per Share |  | Weighted Average Remaining Term |  | Options |  | Weighted Average Option Price per Share |  | Weighted Average Remaining Term
|  | $20.60-$22.69 |  | 11,100 |  |  | $22.34 |  | 0.36 |  | 11,100 |  |  | $22.34 |  | 0.36 years
|  | $28.88-$32.35 |  | 271,579 |  |  | $30.94 |  | 5.65 |  | 222,499 |  |  | $30.92 |  | 5.53 years
|  | $38.05-$41.95 |  | 415,356 |  |  | $40.14 |  | 8.36 |  | 85,766 |  |  | $41.80 |  | 7.19 years
|  | $42.95-$44.75 |  | 210,522 |  |  | $42.94 |  | 8.30 |  | 49,335 |  |  | $43.00 |  | 8.19 years
Total |  |  |  | 908,557 |  |  | $37.82 |  | 7.44 |  | 368,700 |  |  | $34.81 |  | 6.11 years
The weighted average exercise prices of vested and exercisable options as of December 31, 2018 and 2017 were $31.42 and $27.12, respectively. As of December 31, 2019, based on a closing stock price of $43.66 per share, the aggregate intrinsic (in-the-money) values of vested options and all options outstanding were $3.3 million and $5.3 million, respectively. Restricted Stock Units RSUs may be granted to executive officers, other employees and Directors and represent an equal number of common shares to be issued in the future. The RSUs vest in installments based on service or attainment of performance criteria generally beginning in the first year from the date of grant and generally become fully vested 1 to 5 years from the date of grant. The outstanding units accrue dividends at the same rate as dividends paid to HMEC's shareholders. These dividends are reinvested into additional RSUs. Changes in outstanding RSUs were as follows:
|  | Total Outstanding Units |  | Vested Units
|  | Units |  | Weighted Average Grant Date Fair Value per Unit |  | Units |  | Weighted Average Grant Date Fair Value per Unit
December 31, 2018 |  | 1,008,249 |  |  | $35.64 |  | 417,179 |  |  | $20.22
Granted (1) |  | 210,712 |  |  | $41.52 |  | — |  |  | —
Adjustment for performance achievement |  | (3,789 | ) |  | $32.16 |  | — |  |  | —
Vested |  | — |  |  | — |  | 417,454 |  |  | $33.93
Forfeited |  | (34,895 | ) |  | $43.08 |  | — |  |  | —
Distributed (2) |  | (290,839 | ) |  | $31.39 |  | (290,839 | ) |  | $31.39
December 31, 2019 |  | 889,438 |  |  | $31.94 |  | 543,794 |  |  | $24.77
(1) | Includes dividends reinvested into additional RSUs.
(2) Includes distributed units which were utilized to satisfy withholding taxes due on the distribution.

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- Definition The entire disclosure for shareholders' equity and share-based payment arrangement. Includes, but is not limited to, disclosure of policy and terms of share-based payment arrangement, deferred compensation arrangement, and employee stock purchase plan (ESPP). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -URI http://asc.fasb.org/topic&trid=2208762 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -URI http://asc.fasb.org/topic&trid=2228938 + Details
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