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Equity-Based Compensation Plan (Tables) | 12 Months Ended
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Dec. 31, 2018
Equity-Based Compensation Plan [Abstract] |
Schedule Of Share Based Compensation Shares Authorized Under Stock Option Plans By Exercise Price Range [Table Text Block] |
| Year Ended December 31,
| 2018 |  | 2017 |  | 2016
|  |  | Weighted |  |  |  | Weighted |  |  |  | Weighted
| Number |  | Average |  | Number |  | Average |  | Number |  | Average
| Of |  | Exercise |  | Of |  | Exercise |  | Of |  | Exercise
| Options |  | Price |  | Options |  | Price |  | Options |  | Price
Beginning of year | 845,619 |  | $ | 14.14 |  | 917,269 |  | $ | 14.08 |  | 951,523 |  | $ | 12.45
Options exercised | (101,268) |  |  | 13.41 |  | (71,150) |  |  | 12.96 |  | (24,752) |  |  | 12.43
Options forfeited | (5,025) |  |  | 17.05 |  | (500) |  |  | 15.26 |  | (9,502) |  |  | 16.65
End of year | 739,326 |  | $ | 14.28 |  | 845,619 |  | $ | 14.14 |  | 917,269 |  | $ | 14.08
|  | Outstanding |  | Exercisable
|  |  |  |  |  |  |  | Weighted |  |  |  |  |  |
|  |  |  |  |  |  |  | Average |  |  |  |  |  |
|  |  |  |  | Weighted |  | Contract Life |  |  |  |  | Weighted
|  | Number of |  | Average |  | Remaining |  | Number of |  | Average
Range of Exercise Prices |  | Options |  | Exercise Price |  | (Years) |  | Options |  | Exercise Price
$5.63 to $8.45 |  |  | 3,532 |  |  | 8.28 |  | 0.3 |  |  | 3,532 |  |  | 8.28
11.27 to 14.08 |  |  | 313,394 |  |  | 11.81 |  | 2.2 |  |  | 313,394 |  |  | 11.81
14.09 to 16.90 |  |  | 265,675 |  |  | 15.40 |  | 4.7 |  |  | 228,625 |  |  | 15.29
16.91 to 19.71 |  |  | 156,725 |  |  | 17.00 |  | 6.2 |  |  | 78,362 |  |  | 17.44
|  |  | 739,326 |  | $ | 14.28 |  | 3.9 |  |  | 623,913 |  | $ | 13.77
Aggregate Intrinsic Value |  | $ | 1,767,596 |  |  |  |  |  |  | $ | 1,754,258 |  |  |
Schedule Of Share based Compensation Restricted Stock And Restricted Stock Units Activity [Table Text Block] |
| Year Ended December 31,
| 2018 |  | 2017 |  | 2016
|  |  | Weighted |  |  |  | Weighted |  |  |  | Weighted
|  |  | Average |  |  |  | Average |  |  |  | Average
| Restricted |  | Grant Date |  | Restricted |  | Grant Date |  | Restricted |  | Grant Date
| Units |  | Fair Value |  | Units |  | Fair Value |  | Units |  | Fair Value
Beginning of year | 105,800 |  | $ | 14.19 |  | 59,800 |  | $ | 16.64 |  | 138,400 |  | $ | 16.17
Restricted units granted | 176,250 |  |  | 12.12 |  | 83,000 |  |  | 13.31 |  | - |  |  | -
Restricted units lapsed | (24,017) |  |  | 17.12 |  | (33,100) |  |  | 16.10 |  | (76,903) |  |  | 16.04
Restricted units forfeited | (3,983) |  |  | 12.48 |  | (3,900) |  |  | 16.79 |  | (1,697) |  |  | 17.02
End of year | 254,050 |  | $ | 12.50 |  | 105,800 |  | $ | 14.19 |  | 59,800 |  | $ | 16.64

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- Definition Tabular disclosure of option exercise prices, by grouped ranges, including the upper and lower limits of the price range, the number of shares under option, weighted average exercise price and remaining contractual option terms. + 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 -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition Disclosure of the number and weighted-average grant date fair value for restricted stock and restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock and restricted stock units that were granted, vested, or forfeited during the year. + References No definition available. + Details
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- References No definition available. + Details
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