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The period of time, from the grant date until the time at which the share-based (option) award expires.

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Unrecognized cost of unvested share-based compensation awards.

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Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Number of additional shares authorized for issuance under an established share-based compensation plan.

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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).

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The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.

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The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan.

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Number of options or other stock instruments for which the right to exercise has lapsed under the terms of the plan agreements.

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The number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan.

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Gross number of share options (or share units) granted during the period.

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Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding.

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Number of options outstanding, including both vested and non-vested options.

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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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Weighted average price at which option holders acquired shares when converting their stock options into shares.

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Weighted average price at which grantees could have acquired the underlying shares with respect to stock options of the plan that expired.

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Weighted average price at which grantees could have acquired the underlying shares with respect to stock options that were terminated.

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Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of vested portions of options outstanding and currently exercisable.

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Weighted average remaining contractual term for vested portions of options outstanding and currently exercisable or convertible, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Weighted average remaining contractual term for option awards outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Fair value of options vested. Excludes equity instruments other than options, for example, but not limited to, share units, stock appreciation rights, restricted stock.

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SHARE-BASED COMPENSATION (Equity Incentive Plans and Stock Option Activity) (Details) - USD ($) $ / shares in Units, $ in Thousands	1 Months Ended	12 Months Ended
	May 31, 2007	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Apr. 30, 2013	Apr. 30, 2011	Mar. 31, 2011	Sep. 30, 2004
SHARE-BASED COMPENSATION
Grants in period		0	0
Stock Option 2013 Plan
Additional disclosures
Aggregate intrinsic value of options exercised		$ 800	$ 240	$ 31
Stock Option
SHARE-BASED COMPENSATION
Contractual terms		10 years
Shares
Outstanding at the beginning of the period (in shares)		239,417
Changes during the period
Exercised (shares)		(65,472)
Expired (in shares)		0
Forfeited (in shares)		(11,882)
Outstanding at the end of the period (in shares)		162,063	239,417
Exercisable at the end of the period (in shares)		134,331
Weighted Average Exercise Price
Outstanding at the beginning of the period (in dollars per share)		$ 22.01
Changes during the period:
Exercised (in dollars per share)		14.36
Expired (in dollars per share)		0.00
Forfeited (in dollars per share)		24.21
Outstanding at the end of the period (in dollars per share)		24.95	$ 22.01
Exercisable at the end of the period (in dollars per share)		$ 27.14
Weighted Average Remaining Contractual Term
Outstanding		5 years 2 months 12 days
Exercisable at the end of the period		5 years 1 month 6 days
Aggregate Intrinsic Value
Outstanding		$ 2,657
Exercisable at the end of the period		2,183
Additional disclosures
Total compensation cost not yet recognized		$ 100
Weighted-average period for recognition of compensation cost not yet recognized		4 months 1 day
Total fair value of shares vested		$ 400	$ 400	$ 700
Stock Option \| Stock Compensation 2004 Plan
SHARE-BASED COMPENSATION
Shares authorized for grants						4,944,831	1,402,589	1,500,000
Additional shares authorized for grants	1,000,000	1,671,752	1,922,130	1,993,385
Stock Option \| Stock Option 2013 Plan
SHARE-BASED COMPENSATION
Shares authorized for grants					2,200,000
Stock Option \| Minimum
SHARE-BASED COMPENSATION
Vesting period		3 years
Stock Option \| Maximum
SHARE-BASED COMPENSATION
Vesting period		5 years