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STOCK-BASED COMPENSATION - NON-OPTIONS (Details) - USD ($) $ / shares in Units, $ in Thousands | 12 Months Ended
--- | ---
Jun. 30, 2017 | Jun. 30, 2016 | Jun. 30, 2015
Other stock-based compensation |  |  |
Contractual term of awards | 10 years |  |
Minimum |  |  |
Other stock-based compensation |  |  |
Continuous service period for awards to vest | 1 year |  |
Maximum |  |  |
Other stock-based compensation |  |  |
Continuous service period for awards to vest | 3 years |  |
Stock appreciation rights |  |  |
Non-vested other than stock options, number of shares |  |  |
Outstanding at the beginning of the period (in shares) | 367,805 |  |
Granted (in shares) | 63,340 |  |
Exercised (in shares) | (7,000) |  |
Outstanding at the end of the period (in shares) | 424,145 | 367,805 |
Exercisable at the end of the period (in shares) | 269,987 |  |
Other than stock options, weighted-average grant date fair value |  |  |
Non-vested at the beginning of the period (in dollars per share) | $ 62.58 |  |
Granted (in dollars per share) | 83.29 |  |
Exercised (in dollars per share) | 30.96 |  |
Non-vested at the end of the period (in dollars per share) | 66.19 | $ 62.58 |
Exercisable at the end of the period (in dollars per share) | $ 63.62 |  |
Other than stock options, weighted-average remaining contractual life (in years) |  |  |
Outstanding at the end of the period | 6 years 7 months 6 days |  |
Exercisable at the end of the period | 5 years 7 months 6 days |  |
Aggregate Intrinsic Value |  |  |
Intrinsic value on outstanding shares | $ 5,404 |  |
Intrinsic value on exercisable shares | $ 3,928 |  |
Other stock-based compensation |  |  |
Fair value granted (in dollars per share) | $ 29.76 | $ 18.35 | $ 24.42
Total intrinsic value | $ 200 | $ 300 | $ 200
Unrecognized compensation expense | $ 2,000 |  |
Weighted-average vesting period (years) | 1 year 8 months 12 days |  |
Restricted stock |  |  |
Non-vested other than stock options, number of shares |  |  |
Outstanding at the beginning of the period (in shares) | 176,522 |  |
Granted (in shares) | 44,890 |  |
Vested (in shares) | (54,603) |  |
Outstanding at the end of the period (in shares) | 166,809 | 176,522 |
Other than stock options, weighted-average grant date fair value |  |  |
Non-vested at the beginning of the period (in dollars per share) | $ 63.46 |  |
Granted (in dollars per share) | 83.29 |  |
Vested (in dollars per share) | 64.08 |  |
Non-vested at the end of the period (in dollars per share) | $ 68.60 | $ 63.46 |
Other stock-based compensation |  |  |
Unrecognized compensation expense | $ 5,400 |  |
Weighted-average vesting period (years) | 3 years |  |
Restricted stock | Officers and Certain Employees |  |  |
Non-vested other than stock options, number of shares |  |  |
Granted (in shares) | 31,380 |  |
Other stock-based compensation |  |  |
Vesting period | 3 years |  |
Holding period of awards as a vesting condition | 2 years |  |
Vesting (as a percent) | 33.00% |  |
Restricted stock | Non Executive Directors |  |  |
Non-vested other than stock options, number of shares |  |  |
Granted (in shares) | 13,510 |  |
Other stock-based compensation |  |  |
Vesting period | 1 year |  |
Vesting (as a percent) | 50.00% |  |
Percentage of shares granted to non-executive directors, vesting one year after date of grant | 50.00% |  |
Performance stock |  |  |
Non-vested other than stock options, number of shares |  |  |
Outstanding at the beginning of the period (in shares) | 210,178 |  |
Granted (in shares) | 29,830 |  |
Vested (in shares) | (45,774) |  |
Expired (in shares) | (29,550) |  |
Outstanding at the end of the period (in shares) | 164,684 | 210,178 |
Other than stock options, weighted-average grant date fair value |  |  |
Non-vested at the beginning of the period (in dollars per share) | $ 63.78 |  |
Granted (in dollars per share) | 68.47 |  |
Vested (in dollars per share) | 65.57 |  |
Expired (in dollars per share) | 68.18 |  |
Non-vested at the end of the period (in dollars per share) | $ 68.53 | $ 63.78 |
Other stock-based compensation |  |  |
Unrecognized compensation expense | $ 1,400 |  |
Weighted-average vesting period (years) | 1 year 9 months 18 days |  |
Earn out basis if no goals are met (as a percent) | 0.00% |  |
Earn out basis if some goals are met (as a percent) | 100.00% |  |
Earn out basis if all goals are met (as a percent) | 200.00% |  |
Performance stock | Vesting upon achievement of annual growth in Net GEOs |  |  |
Other stock-based compensation |  |  |
Vesting (as a percent) | 50.00% |  |
Performance stock | Vesting upon achievement of annual growth in Net TSR |  |  |
Other stock-based compensation |  |  |
Vesting (as a percent) | 50.00% |  |
Gold Equivalent Ounces Shares |  |  |
Other stock-based compensation |  |  |
Contractual term of awards | 5 years |  |
Total Shareholder Return Shares |  |  |
Other stock-based compensation |  |  |
Fair value granted (in dollars per share) | $ 53.65 |  |
Contractual term of awards | 3 years |  |
Continuous service period for awards to vest | 3 years |  |

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