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SHARE-BASED AWARDS - SUMMARY (Details) $ / shares in Units, shares in Thousands, $ in Thousands | 12 Months Ended
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Dec. 31, 2016 USD ($) plan $ / shares shares
Stock options |
Activity in the entity's stock option plans |
Outstanding, beginning of period (in shares) | 461
Exercised (in shares) | 128
Forfeited and expired (in shares) | 9
Outstanding, end of period (in shares) | 324
Exercisable, end of period (in shares) | 324
Weighted average exercise price |
Outstanding, weighted average exercise price, beginning of period (in dollars per share) | $ / shares | $ 21.90
Exercised, weighted average exercise price (in dollars per share) | $ / shares | 22.53
Forfeited and expired, weighted average exercise price (in dollars per share) | $ / shares | 20.84
Outstanding, weighted average exercise price, end of period (in dollars per share) | $ / shares | 21.67
Exercisable, weighted average exercise price, end of period (in dollars per share) | $ / shares | $ 21.67
Outstanding, weighted average contractual life, end of period | 3 years 3 months 18 days
Exercisable, weighted average contractual life, end of period | 3 years 3 months 18 days
Outstanding, aggregate intrinsic value, end of period (in dollars) | $ | $ 4,437
Exercisable, aggregate intrinsic value, end of period (in dollars) | $ | $ 4,437
Restricted Stock Units |
Share-based compensation |
Options granted, weighted average grant-date fair value (in dollars per share) | $ / shares | $ 34.70
Restricted Stock Units | Automatic Grant Program | Minimum |
Share-based compensation |
Vesting period of awards granted | 1 year
Restricted Stock Units | Automatic Grant Program | Maximum |
Share-based compensation |
Vesting period of awards granted | 3 years
2016 Plan |
Share-based compensation |
Common stock initially available for future issuance (in shares) | 2,500
Number of separate incentive compensation programs | plan | 4
Number of share based compensation plans within the entity's incentive compensation programs | plan | 3
2007 Plan | Discretionary Grant Program |
Share-based compensation |
Minimum exercise price as a percentage of fair market value of common stock | 100.00%
Exercisable period | 3 years
Expiration Term | 10 years
2007 Plan | Stock options |
Activity in the entity's stock option plans |
Outstanding, beginning of period (in shares) | 403
Exercised (in shares) | 75
Forfeited and expired (in shares) | 9
Outstanding, end of period (in shares) | 319
Exercisable, end of period (in shares) | 319
2007 Plan | Time-Based Restricted Stock Units | Stock Issuance Program |
Share-based compensation |
Vesting period of awards granted | 3 years
2007 Plan | Performance-Based Restricted Stock Units | Stock Issuance Program |
Share-based compensation |
Vesting period of awards granted | 3 years
1998 Plan | Stock options |
Activity in the entity's stock option plans |
Outstanding, beginning of period (in shares) | 42
Exercised (in shares) | 37
Outstanding, end of period (in shares) | 5
Exercisable, end of period (in shares) | 5
Predecessor Plan 1998 Directors' Plan | Stock options |
Activity in the entity's stock option plans |
Outstanding, beginning of period (in shares) | 16
Exercised (in shares) | 16
Outstanding, end of period (in shares) | 0

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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition For presentations that combine terminations, 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 or that expired. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(3)-(4) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Period from grant date that an equity-based award expires, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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