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Stock-Based Compensation Plans (Tables) | 6 Months Ended
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Jun. 30, 2019
Stock-Based Compensation Plans [Abstract] |
Restricted and Performance-based Share Activity | Our restricted and performance-based share activity was as follows for the six months ended June 30, 2019:
|  | Shares |  |  | Weighted Average Grant Date Fair Value Per Share |
Balance at December 31, 2018 |  |  | 870,041 |  |  | $ | 34.59 |
Granted |  |  | 8,000 |  |  |  | 40.11 |
Vested |  |  | (36,889 | ) |  |  | 32.72 |
Forfeited |  |  | (8,975 | ) |  |  | 44.27 |
Balance at June 30, 2019 |  |  | 832,177 |  |  | $ | 34.62 |

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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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