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Employee Benefit Plans and Share-Based Payments (Tables) | 12 Months Ended
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Dec. 31, 2017
Plan 2013-15 [Member] |
Summary of Share Based Benefit Plan | Plan 2013-2015
|  | 2017 |  |  | 2016 |  |  | 2015 |
Amount at the beginning of the year |  |  | — |  |  |  | 188,493 |  |  |  | 695,015 |
- Granted |  |  | — |  |  |  | 9,130 |  |  |  | — |
- Settled |  |  | — |  |  |  | (193,878 | ) |  |  | (503,535 | )
- Expired |  |  | — |  |  |  | (3,745 | ) |  |  | (2,987 | )
Amount at end of year(1) |  |  | — |  |  |  | — |  |  |  | 188,493 |
Expense recognized during the year |  |  | — |  |  |  | 6 |  |  |  | 34 |
Fair value of shares on grant date (in dollars) |  |  | — |  |  |  | 14.75 |  |  |  | 14.75 |
(1) | The life of the plan in 2016 was 7 months and between 10 and 19 months as of December 2015.
Plan 2014-17 [Member] |
Summary of Share Based Benefit Plan | Plan 2014-2017
|  | 2017 |  |  | 2016 |  |  | 2015 |
Amount at the beginning of the year |  |  | 99,278 |  |  |  | 234,130 |  |  |  | 356,054 |
- Granted |  |  | 6,269 |  |  |  | 6,978 |  |  |  | — |
- Settled |  |  | (105,201 | ) |  |  | (123,926 | ) |  |  | (118,927 | )
- Expired |  |  | (346 | ) |  |  | (17,904 | ) |  |  | (2,997 | )
Amount at end of year(1) |  |  | — |  |  |  | 99,278 |  |  |  | 234,130 |
Expense recognized during the year |  |  | 8 |  |  |  | 28 |  |  |  | 53 |
Fair value of shares on grant date (in dollars) |  |  | 33.41 |  |  |  | 33.41 |  |  |  | 33.41 |
(1) | The life of the plan in 2017 was 7 months, whereas the remaining life as of December 31, 2016 was 7 months, and between 7 and 19 months as of December 2015.
Plan 2015-18 [Member] |
Summary of Share Based Benefit Plan | Plan 2015-2018
|  | 2017 |  |  | 2016 |  |  | 2015 |
Amount at the beginning of the year |  |  | 339,459 |  |  |  | 602,079 |  |  |  | — |
- Granted |  |  | 2,682 |  |  |  | — |  |  |  | 619,060 |
- Settled |  |  | (168,814 | ) |  |  | (202,227 | ) |  |  | (888 | )
- Expired |  |  | (11,276 | ) |  |  | (60,393 | ) |  |  | (16,093 | )
Amount at end of year(1) |  |  | 162,051 |  |  |  | 339,459 |  |  |  | 602,079 |
Expense recognized during the year |  |  | 26 |  |  |  | 63 |  |  |  | 37 |
Fair value of shares on grant date (in dollars) |  |  | 19.31 |  |  |  | 19.31 |  |  |  | 19.31 |
(1) | The average remaining life of the plan was 7 months as of December 31, 2017, between 7 and 31 months as of December 31, 2016 and between 7 and 31 months as of December 2015.
Plan 2016-19 [Member] |
Summary of Share Based Benefit Plan | Plan 2016-2019
|  | 2017 |  |  | 2016 |
Amount at the beginning of the year |  |  | 682,307 |  |  |  | — |
- Granted |  |  | — |  |  |  | 682,307 |
- Settled |  |  | (228,981 | ) |  |  | — |
- Expired |  |  | (59,354 | ) |  |  | — |
Amount at end of year(1) |  |  | 393,972 |  |  |  | 682,307 |
Expense recognized during the year |  |  | 59 |  |  |  | 56 |
Fair value of shares on grant date (in dollars) |  |  | 16.99 |  |  |  | 16.99 |
(1) | The average remaining life of the plan is between 7 and 19 months as of December 2017 and between 7 and 31 months as of December 31, 2016.
Plan 2017-2020 [Member] |
Summary of Share Based Benefit Plan | Plan 2017-2020
|  | 2017 |
Amount at the beginning of the year |  |  | — |
- Granted |  |  | 646,149 |
- Settled |  |  | — |
- Expired |  |  | (1,200 | )
Amount at end of year(1) |  |  | 644,949 |
Expense recognized during the year |  |  | 69 |
Fair value of shares on grant date (in dollars) |  |  | 20.26 |
(1) | The average remaining life of the plan is between 7 and 31 months as of December 31, 2017.

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