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Stock-Based Compensation (Tables) | 12 Months Ended
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Dec. 31, 2020
Share-based Payment Arrangement [Abstract] |
Summary of Restricted Stock Award / Unit Activity | The following table is a summary of restricted stock award activity:
| Year Ended December 31,
| 2020 |  | 2019 |  | 2018
| Shares |  | Weighted- Average Grant Date Fair Value per Share |  | Shares |  | Weighted- Average Grant Date Fair Value per Share |  | Shares |  | Weighted- Average Grant Date Fair Value per Share
Outstanding at beginning of period | 58,834 |  |  | $ | 25.19 |  |  | 150,293 |  |  | $ | 28.12 |  |  | 161,450 |  |  | $ | 28.00 |
Granted | — |  |  | — |  |  | 55,500 |  |  | 25.29 |  |  | — |  |  | — |
Vested | (6,334) |  |  | 24.39 |  |  | (143,959) |  |  | 28.29 |  |  | (7,157) |  |  | 25.17 |
Forfeited | (2,000) |  |  | 25.29 |  |  | (3,000) |  |  | 25.29 |  |  | (4,000) |  |  | 28.45 |
Outstanding at end of period(1)(2) | 50,500 |  |  | $ | 25.29 |  |  | 58,834 |  |  | $ | 25.19 |  |  | 150,293 |  |  | $ | 28.12 |
__________________________________________________________________ (1)As of December 31, 2020, the aggregate intrinsic value was $0.8 million and was calculated by multiplying the closing market price of the Company's stock on December 31, 2020 by the number of non-vested restricted stock awards outstanding. (2)As of December 31, 2020, the weighted average remaining contractual term of non-vested restricted stock awards outstanding was 1.4 years. The following table is a summary of restricted stock unit activity:
| Year Ended December 31,
| 2020 |  | 2019 |  | 2018
| Shares |  | Weighted- Average Grant Date Fair Value per Share |  | Shares |  | Weighted- Average Grant Date Fair Value per Share |  | Shares |  | Weighted- Average Grant Date Fair Value per Share
Outstanding at beginning of period | 574,219 |  |  | $ | 18.47 |  |  | 490,415 |  |  | $ | 17.41 |  |  | 407,563 |  |  | $ | 16.17 |
Granted and fully vested | 130,065 |  |  | 15.88 |  |  | 83,804 |  |  | 24.70 |  |  | 82,852 |  |  | 23.47 |
Issued | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |
Forfeited | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |
Outstanding at end of period(1)(2) | 704,284 |  |  | $ | 17.99 |  |  | 574,219 |  |  | $ | 18.47 |  |  | 490,415 |  |  | $ | 17.41 |
_______________________________________________________________________________ (1)As of December 31, 2020, the aggregate intrinsic value was $11.5 million and was calculated by multiplying the closing market price of the Company's stock on December 31, 2020 by the number of outstanding restricted stock units. (2)Due to the immediate vesting of the units and the unknown term of each director, the weighted-average remaining contractual term in years has not been provided.
Schedule of Performance Share Awards Activity | The following table is a summary of activity for Employee Performance Share Awards:
| Year Ended December 31,
| 2020 |  | 2019 |  | 2018
| Shares |  | Weighted- Average Grant Date Fair Value per Share |  | Shares |  | Weighted- Average Grant Date Fair Value per Share |  | Shares |  | Weighted- Average Grant Date Fair Value per Share
Outstanding at beginning of period | 1,259,287 |  |  | $ | 23.64 |  |  | 1,280,021 |  |  | $ | 22.22 |  |  | 1,095,970 |  |  | $ | 23.31 |
Granted | 722,500 |  |  | 15.60 |  |  | 526,730 |  |  | 24.95 |  |  | 531,670 |  |  | 23.25 |
Issued and fully vested | (334,640) |  |  | 22.60 |  |  | (388,370) |  |  | 20.49 |  |  | (315,970) |  |  | 27.71 |
Forfeited | (37,023) |  |  | 20.38 |  |  | (159,094) |  |  | 24.29 |  |  | (31,649) |  |  | 22.33 |
Outstanding at end of period | 1,610,124 |  |  | $ | 20.31 |  |  | 1,259,287 |  |  | $ | 23.64 |  |  | 1,280,021 |  |  | $ | 22.22 |
The following table is a summary of activity for the Hybrid Performance Share Awards:
| Year Ended December 31,
| 2020 |  | 2019 |  | 2018
| Shares |  | Weighted- Average Grant Date Fair Value per Share |  | Shares |  | Weighted- Average Grant Date Fair Value per Share |  | Shares |  | Weighted- Average Grant Date Fair Value per Share
Outstanding at beginning of period | 692,788 |  |  | $ | 23.90 |  |  | 662,388 |  |  | $ | 22.48 |  |  | 574,354 |  |  | $ | 22.72 |
Granted | 506,412 |  |  | 15.60 |  |  | 315,029 |  |  | 24.95 |  |  | 321,720 |  |  | 23.25 |
Issued and fully vested | (295,649) |  |  | 23.40 |  |  | (284,629) |  |  | 21.78 |  |  | (233,686) |  |  | 24.12 |
Forfeited | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |
Outstanding at end of period | 903,551 |  |  | $ | 19.41 |  |  | 692,788 |  |  | $ | 23.90 |  |  | 662,388 |  |  | $ | 22.48 |
The following table is a summary of activity for the TSR Performance Share Awards:
| Year Ended December 31,
| 2020 |  | 2019 |  | 2018
| Shares |  | Weighted- Average Grant Date Fair Value per Share(1) |  | Shares |  | Weighted- Average Grant Date Fair Value per Share(1) |  | Shares |  | Weighted- Average Grant Date Fair Value per Share(1)
Outstanding at beginning of period | 1,428,634 |  |  | $ | 20.17 |  |  | 1,299,868 |  |  | $ | 19.47 |  |  | 1,109,708 |  |  | $ | 19.23 |
Granted | 862,180 |  |  | 13.79 |  |  | 536,673 |  |  | 20.63 |  |  | 482,581 |  |  | 19.92 |
Issued and fully vested | (891,961) |  |  | 19.89 |  |  | (407,907) |  |  | 18.57 |  |  | (292,421) |  |  | 19.29 |
Forfeited | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |
Outstanding at end of period | 1,398,853 |  |  | $ | 16.41 |  |  | 1,428,634 |  |  | $ | 20.17 |  |  | 1,299,868 |  |  | $ | 19.47 |
_______________________________________________________________________________ (1)The grant date fair value figures in this table represent the fair value of the equity component of the performance share awards.
Assumptions Used to Determine Grant Date Fair Value of Equity and Liability Component | The following assumptions were used to determine the grant date fair value of the equity component of the TSR Performance Share Awards for the respective periods:
| Year Ended December 31,
| 2020 |  | 2019 |  | 2018
Fair value per performance share award granted during the period | $ | 13.79 |  |  | $ | 20.63 |  |  | $ | 19.92 |
Assumptions |  |  |  |  |
Stock price volatility | 29.5 | % |  | 31.3 | % |  | 37.3 | %
Risk free rate of return | 1.4 | % |  | 2.5 | % |  | 2.4 | %
The following assumptions were used to determine the fair value of the liability component of the TSR Performance Share Awards for the respective periods:
| December 31,
| 2020 |  | 2019 |  | 2018
Fair value per performance share award at the end of the period | $10.37 - $10.81 |  | $6.18 - $14.80 |  | $15.15 - $20.12
Assumptions |  |  |  |  |
Stock price volatility | 42.4% - 52.4% |  | 29.8% - 30.4% |  | 29.9% - 31.1%
Risk free rate of return | 0.1% |  | 1.6% |  | 2.5% - 2.6%

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- Definition Tabular disclosure of share-based payment arrangement. + 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=120381028&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=120381028&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of the changes in outstanding nonvested performance-based 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=120381028&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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