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Stock-Based Compensation (Tables) | 12 Months Ended
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Dec. 31, 2018
Share-based Compensation [Abstract] |
Schedule of Nonvested Share Activity | The following table summarizes the restricted stock award, deferred stock units, and performance unit award activity for the years ended December 31, 2018 and 2017:
|  | Restricted Stock |  | Deferred Stock Units |  | Performance Stock Units |  | Weighted Average Aggregate Grant Date Fair Value
Outstanding as of January 1, 2017 |  | 79,272 |  | — |  | 63,690 |  | $ | 21.66
Granted |  | 175,196 |  | 26,860 |  | 120,583 |  | 14.46
Vested |  | (22,808) |  | — |  | — |  | 28.88
Adjustment for incentive awards expected to vest |  | — |  | — |  | 46,130 |  | 19.00
Canceled and forfeited |  | (44,854) |  | — |  | (49,062) |  | 15.40
Outstanding as of December 31, 2017 |  | 186,806 |  | 26,860 |  | 181,341 |  | $ | 16.53
Granted |  | 62,320 |  | 14,914 |  | 65,421 |  | 27.05
Vested |  | (36,876) |  | — |  | — |  | 28.07
Adjustment for incentive awards expected to vest |  | — |  | — |  | 65,491 |  | 26.93
Canceled and forfeited |  | (20,425) |  | — |  | (11,880) |  | 16.38
Outstanding as of December 31, 2018 |  | 191,825 |  | 41,774 |  | 300,373 |  | $ | 18.61

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- Definition Tabular disclosure of the changes in outstanding nonvested 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 (c)(2) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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