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Stock Based Compensation (Tables) | 6 Months Ended
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Jun. 30, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Disclosure of Share-based Compensation Arrangements by Share-based Payment Award [Table Text Block] | Activity under the Company’s option plans as of and for the three months ended June 30, 2018 was as follows:
|  |  |  |  |  |  |  | Weighted- |  |  |
|  |  |  |  |  |  |  | Average |  |  |
|  |  |  |  | Weighted- |  | Remaining |  |  |
|  |  |  |  | Average |  | Contractual |  |  |
|  |  |  |  | Exercise |  | Term |  | Aggregate
|  | Shares |  | Price |  | (In Years) |  | Intrinsic Value
Outstanding at December 31, 2017 |  | 299,778 |  |  | $ | 6.18 |  |  |  |  |
Granted |  |  |  |  |  |  |  |  |  |  |
Exercised |  | (46,497 | ) |  |  | 5.42 |  |  |  |  |
Forfeited/cancelled/expired |  | (1,323 | ) |  |  | 14.24 |  |  |  |  |
Outstanding at June 30, 2018 |  | 251,958 |  |  |  | 6.28 |  | 1.7 |  | $ | 4,690,971
Exercisable at June 30, 2018 |  | 249,751 |  |  |  | 6.21 |  | 1.6 |  | $ | 4,667,445
Schedule of Nonvested Restricted Stock Units Activity [Table Text Block] | Activity under the Company’s restricted shares as of and for the six months ended June 30, 2018 was as follows:
|  |  |  |  | Weighted-
|  |  |  |  | Average
|  | Nonvested |  | Grant Date
|  | Shares |  | Fair Value
Nonvested at December 31, 2017 |  | 103,078 |  |  | $ | 20.41
Granted |  | 23,018 |  |  |  | 28.08
Vested |  | (58,002 | ) |  |  | 20.33
Forfeited/cancelled/expired |  | (666 | ) |  |  | 24.25
Nonvested at June 30, 2018 |  | 67,428 |  |  |  | 23.07
Schedule of Unearned Performance Unit Awards [Table Text Block] | A summary of the status of unearned performance unit awards and the change during the period is presented in the table below:
|  |  |  |  |  |  | Weighted
|  |  |  |  |  |  | Average Grant
|  | Units |  | Units |  | Date Fair
|  | (expected) |  | (maximum) |  | Value
Unearned at December 31, 2017 |  | 151,194 |  |  |  |  | $ | 19.19
Awarded |  | 19,614 |  |  |  |  |  | 31.35
Change in Estimate |  | (20,595 | ) |  |  |  |  |
Vested |  | (69,627 | ) |  |  |  |  | 19.46
Unearned at June 30, 2018 |  | 80,586 |  |  | 151,772 |  |  | 22.53
Schedule of Unearned Restricted Unit Awards [Table Text Block] | A summary of the status of unearned restricted share units and the change during the period is presented in the table below:
|  |  |  | Weighted
|  |  |  | Average Grant
|  | Units |  | Date Fair
|  | (expected) |  | Value
Unearned at December 31, 2017 |  | - |  | $ | -
Awarded |  | 29,423 |  |  | 31.35
Forfeited |  | - |  |  | -
Vested |  | - |  |  | -
Unearned at June 30, 2018 |  | 29,423 |  | $ | 31.35

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- Definition Tabular disclosure of components of a stock option or other award plan under which equity-based compensation is awarded to employees, typically comprised of the amount of unearned compensation (deferred compensation cost), compensation expense, and changes in the quantity and fair value of the shares (or other type of equity) granted, exercised, forfeited, and issued and outstanding pertaining to that plan. Disclosure may also include nature and general terms of such arrangements that existed during the period and potential effects of those arrangements on shareholders, effect of compensation cost arising from equity-based payment arrangements on the income statement, method of estimating the fair value of the goods or services received, or the fair value of the equity instruments granted, during the period, cash flow effects resulting from equity-based payment arrangements and, for registrants that accelerate vesting of out of the money share options, reasons for the decision to accelerate. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5047-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of the changes in outstanding nonvested restricted stock units. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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