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STOCK-BASED COMPENSATION (Details) (USD $) | 12 Months Ended
--- | ---
Dec. 31, 2013 item | Dec. 31, 2012 | Dec. 31, 2011
Option valuation assumptions for options granted |  |  |
Cash received for all stock option exercises | $ 3,438,091 | $ 52,995 |
Tax benefit realized from stock awards exercised | 413,238 |  |
Stock options |  |  |
STOCK-BASED COMPENSATION |  |  |
Number of stock option plans | 3 |  |
Number of common shares authorized to be purchased | 3,250,000 |  |
Vesting rights percentage | 33.33% |  |
Expiration term | 10 years |  |
Options |  |  |
Outstanding at beginning of period (in shares) | 3,134,320 |  |
Granted (in shares) | 367,698 |  |
Exercised (in shares) | (335,444) |  |
Forfeited (in shares) | (280,000) |  |
Outstanding at end of period (in shares) | 2,886,574 | 3,134,320 |
Exercisable at end of period (in shares) | 1,683,504 |  |
Weighted-Average Exercise Price |  |  |
Outstanding at beginning of period (in dollars per share) | $ 11.29 |  |
Granted (in dollars per share) | $ 18.53 |  |
Exercised (in dollars per share) | $ 10.25 |  |
Forfeited (in dollars per share) | $ 8.95 |  |
Outstanding at end of period (in dollars per share) | $ 12.51 | $ 11.29 |
Exercisable at end of period (in dollars per share) | $ 13.05 |  |
Weighted Average Remaining Contractual Term |  |  |
Outstanding at end of period | 6 years 1 month 6 days |  |
Exercisable at end of period | 4 years 4 months 24 days |  |
Aggregate Intrinsic Value |  |  |
Outstanding at end of period (in dollars) | 23,421,823 |  |
Exercisable at end of period (in dollars) | 13,095,301 |  |
Nonvested Shares |  |  |
Nonvested at the beginning of the period (in shares) | 1,497,739 |  |
Granted (in shares) | 367,698 |  |
Vested (in shares) | (382,367) |  |
Forfeited (in shares) | (280,000) |  |
Nonvested at the end of the period (in shares) | 1,203,070 | 1,497,739 |
Weighted-Average Grant Date Fair Value |  |  |
Nonvested at the beginning of the period (in dollars per share) | $ 9.49 |  |
Granted (in dollars per share) | $ 5.38 |  |
Vested (in dollars per share) | $ 2.94 |  |
Forfeited (in dollars per share) | $ 8.95 |  |
Nonvested at the end of the period (in dollars per share) | $ 12.51 | $ 9.49 |
Unrecognized costs |  |  |
Unrecognized costs related to all stock-based awards outstanding | 1,300,000 |  |
Weighted average period for recognition of unrecognized compensation costs | 2 years 8 months 12 days |  |
Option valuation assumptions for options granted |  |  |
Expected volatility (as a percent) | 37.03% | 56.10% | 56.10%
Weighted average risk free rate (as a percent) | 0.85% | 0.40% | 0.70%
Weighted average grant date fair value per share of options granted (in dollars per share) | $ 5.38 | $ 3.43 | $ 3.89
Total fair value of shares vested | 1,122,577 | 1,918,460 | 1,190,274
Total intrinsic value of options exercised | 2,736,529 | 41,240 |
Cash received for all stock option exercises | 3,438,091 | 52,995 |
Tax benefit realized from stock awards exercised | $ 957,785 | $ 13,816 |
Stock options | Directors' Plan |  |  |
Option valuation assumptions for options granted |  |  |
Expected life | 3 years 3 months 25 days | 9 years 6 months | 9 years 6 months
Stock options | Executive Plan |  |  |
Option valuation assumptions for options granted |  |  |
Expected life | 4 years 5 months 23 days | 3 years 1 month 6 days | 3 years 1 month 6 days
Stock options | Employee Plan |  |  |
Option valuation assumptions for options granted |  |  |
Expected life | 3 years 3 months 25 days | 3 years 1 month 6 days | 3 years 1 month 6 days

X
- Definition Represents the information related to weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option valuation assumptions. + References No definition available. + Details
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- Definition The weighted average grant-date fair value of unvested 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. + References No definition available. + Details
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- Definition The weighted average fair value as of the grant date of stock option award for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement. + References No definition available. + Details
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- Definition Description of award terms as to how many shares or portion of an award are no longer contingent on satisfaction of either a service condition, market condition or a performance condition, thereby giving the employee the legal right to convert the award to shares, expressed as a percentage. + References No definition available. + Details
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- Definition 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. + 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 (i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Expected term of share-based compensation awards, 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 S99 -Paragraph 1 -Subparagraph (SAB TOPIC 14.D.2) -URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2)(i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 14 -Section D -Subsection 2 + Details
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- Definition The estimated measure of the percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period. + 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 (f)(2)(ii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The risk-free interest rate assumption that is used in valuing an option on its own shares. + 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 (f)(2)(iv) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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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 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)(3) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition 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. + 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)(iii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition 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. + 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)(iii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares. + 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 (d)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition 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. + 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) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Gross number of share options (or share units) granted during the period. + References No definition available. + Details
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- Definition The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology. + 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 (d)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Number of options outstanding, including both vested and non-vested options. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition 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. + 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 (e)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Fair value of options vested. Excludes equity instruments other than options, for example, but not limited to, share units, stock appreciation rights, restricted stock. + 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) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options. + References No definition available. + Details
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