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Share-Based Compensation (Tables) | 6 Months Ended
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Jun. 30, 2017
Summary of RSUs Outstanding Under LTIP | A summary of the RSUs outstanding under the LTIP for the six months ended June 30, 2017 is as follows:
|  | Restricted Share Units |
|  | Performance and Service Required (1) |  |  | Service Required |  |  | Total Restricted Share Units |  |  | Weighted-Average Grant-Date Fair Value |
Nonvested as of January 1, 2017 |  |  | 130,168 |  |  |  | 15,974 |  |  |  | 146,142 |  |  | $ | 38.46 |
Granted |  |  | 80,247 |  |  |  | 10,560 |  |  |  | 90,807 |  |  |  | 54.60 |
Vested |  |  | 0 |  |  |  | 0 |  |  |  | 0 |  |  |  | 0.00 |
Forfeited |  |  | (9,843 | ) |  |  | (2,461 | ) |  |  | (12,304 | ) |  |  | 46.86 |
Nonvested as of June 30, 2017 |  |  | 200,572 |  |  |  | 24,073 |  |  |  | 224,645 |  |  | $ | 44.53 |
(1) | Nonvested performance-based RSUs are reflected at the maximum performance achievement level.
Long Term Incentive Plan [Member] |
Stock Option Activity in Company's Plan | Stock option activity under the Company’s LTIP for six months ended June 30, 2017 was as follows:
|  | Number of Shares |  |  | Weighted Average Exercise Price per Share |  |  | Weighted Average Remaining Contractual Term (Years) |  |  | Aggregate Intrinsic Value |
Outstanding at January 1, 2017 |  |  | 52,750 |  |  | $ | 54.54 |  |  |  |  |  |  |  |  |
Granted |  |  | 5,000 |  |  | $ | 48.00 |  |  |  |  |  |  |  |  |
Exercised |  | 0 |  |  | $ | 0.00 |  |  |  |  |  |  |  |  |
Forfeited |  | 0 |  |  | $ | 0.00 |  |  |  |  |  |  |  |  |
Outstanding (vested and expected to vest) at June 30, 2017 |  |  | 57,750 |  |  | $ | 53.98 |  |  |  | 7.0 |  |  | $ | 20 |
Exercisable at June 30, 2017 |  |  | 42,875 |  |  | $ | 56.55 |  |  |  | 6.5 |  |  | $ | 15 |
Stock Options [Member] |
Stock Option Activity in Company's Plan | Activity in the Company’s 1999 Stock Option Plan for the six months ended June 30, 2017 as follows:
|  | Number of Shares |  |  | Weighted Average Exercise Price per Share |  |  | Weighted Average Remaining Contractual Term (Years) |  |  | Aggregate Intrinsic Value |
Outstanding at January 1, 2017 |  |  | 5,550 |  |  | $ | 48.35 |  |  |  |  |  |  |  |  |
Granted |  |  | 0 |  |  | $ | 0.00 |  |  |  |  |  |  |  |  |
Exercised |  | 0 |  |  | $ | 0.00 |  |  |  |  |  |  |  |  |
Forfeited |  |  | 0 |  |  | $ | 0.00 |  |  |  |  |  |  |  |  |
Outstanding (exercisable and vested) at June 30, 2017 |  |  | 5,550 |  |  | $ | 48.35 |  |  |  | 1.3 |  |  | $ | 11 |

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- Definition Tabular disclosure of the number and weighted-average grant date fair value for restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock units that were granted, vested, or forfeited during the year. + 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) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure for stock option plans. Includes, but is not limited to, outstanding awards at beginning and end of year, grants, exercises, forfeitures, and weighted-average grant date fair value. + 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) -URI http://asc.fasb.org/extlink&oid=96867065&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 (e) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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