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STOCK BASED COMPENSATION - Other equity instruments (Details) |  | 12 Months Ended |  |
--- | --- | --- | --- | ---
Mar. 23, 2018 EquityInstruments | Dec. 31, 2017 USD ($) EquityInstruments shares | Dec. 31, 2016 USD ($) EquityInstruments shares | May 31, 2015 shares | Apr. 30, 2015 shares
ISPP |  |  |  |  |
Share based compensation |  |  |  |  |
Percentage of contribution to the plan by participants from their annual salaries |  | 10.00% |  |  |
Percentage of contribution to the plan by company on the participants contribution |  | 50.00% |  |  |
Total compensation cost |  | $ 5,800,000 | $ 5,100,000 |  |
Number of common shares subscribed | shares |  | 382,663 | 344,778 |  |
Value of common shares subscribed |  | $ 17,400,000 | $ 15,400,000 |  |
Maximum number of common shares reserved for issuance | shares |  |  |  | 7,100,000 | 6,100,000
Number of awards available for grant | shares |  | 1,172,307 | 1,554,970 |  |
RSU |  |  |  |  |
Share based compensation |  |  |  |  |
Number of awards granted | EquityInstruments |  | 369,623 | 354,592 |  |
Fair value at grant date |  | $ 44.42 | $ 28.62 |  |
Amount transferred to an employee benefit trust to be used to purchase common shares of the company in the open market |  | 16,400,000 | 10,100,000 |  |
Total compensation expense recorded in the general and administrative |  | $ 13,100,000 | $ 10,400,000 |  |
PSU |  |  |  |  |
Share based compensation |  |  |  |  |
Vesting period |  | 3 years |  |  |
Number of awards granted | EquityInstruments |  | 182,000 | 183,000 |  |
Fair value at grant date |  | $ 49.38 | $ 32.20 |  |
Amount transferred to an employee benefit trust to be used to purchase common shares of the company in the open market |  | 8,100,000 | 5,300,000 |  |
Total compensation expense recorded in the general and administrative |  | $ 6,000,000 | $ 2,200,000 |  |
Maximum | RSU |  |  |  |  |
Share based compensation |  |  |  |  |
Vesting period |  | 3 years |  |  |
Subsequent events | RSU |  |  |  |  |
Share based compensation |  |  |  |  |
Number of awards granted | EquityInstruments | 372,200 |  |  |  |
Subsequent events | PSU |  |  |  |  |
Share based compensation |  |  |  |  |
Number of awards granted | EquityInstruments | 180,000 |  |  |  |

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- Definition The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested). + References No definition available. + Details
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- Definition The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable. + References No definition available. + Details
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- Definition The vesting life of awards in a share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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