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Employee Benefit Plans (Tables) | 12 Months Ended
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Dec. 31, 2018
Retirement Benefits [Abstract] |
Schedule of Defined Benefit Plans Disclosures | The status of the Company’s plan at December 31, 2018, 2017, and 2016:
|  | Post-Employment Benefit Plan |
|  | December 31, |
|  | 2018 |  | 2017 |  | 2016 |
Change in benefit obligation: |  |  |  |  |  |  |
Beginning of year |  | $ | 3,604 |  |  | $ | 4,106 |  |  | $ | 4,681 |  |
Service cost |  | 22 |  |  | 25 |  |  | 36 |  |
Interest cost |  | 100 |  |  | 122 |  |  | 142 |  |
Actuarial gain |  | (196 | ) |  | (261 | ) |  | (297 | ) |
Benefits paid |  | (421 | ) |  | (388 | ) |  | (456 | ) |
Other |  | (47 | ) |  | — |  |  | — |  |
Benefit obligation at end of year |  | $ | 3,062 |  |  | $ | 3,604 |  |  | $ | 4,106 |  |
Schedule of Assumptions Used | Assumptions used to determine accumulated benefit obligations as of year end:
|  | Post-Employment Benefit Plan |
|  | Year Ended December 31, |
|  | 2018 |  | 2017 |
Discount rate |  | 3.67% |  | 2.96% |
Measurement date |  | December 31, 2018 |  | December 31, 2017 |
Assumptions used to determine net benefit cost (credit) for 2018, 2017, and 2016:
|  | Post-Employment Benefit Plan
|  | Year Ended December 31,
|  | 2018 |  | 2017 |  | 2016 |
Discount rate |  | 2.96 | % |  | 3.15 | % |  | 3.20 | % |
Average compensation increase |  | N/A |  |  | N/A |  |  | N/A |  |
Schedule of Net Benefit Costs | Components of net benefit cost (credit):
|  | Post-Employment Benefit Plan |
|  | Year Ended December 31, |
|  | 2018 |  | 2017 |  | 2016 |
Service cost |  | $ | 22 |  |  | $ | 25 |  |  | $ | 36 |  |
Interest cost |  | 100 |  |  | 122 |  |  | 142 |  |
Amortization of unrecognized prior service cost |  | (37 | ) |  | (339 | ) |  | (338 | ) |
Amortization of unrecognized net actuarial loss |  | 92 |  |  | 184 |  |  | 269 |  |
Net benefit cost (credit) |  | $ | 177 |  |  | $ | (8 | ) |  | $ | 109 |  |
The estimated amount that will be recognized from accumulated other comprehensive income (loss) into net periodic benefit cost during 2019:
| Post-Employment Benefit Plan |
Actuarial net loss | $ | (23 | ) |
Net prior service credits | 15 |  |
Net amount recognized | $ | (8 | ) |
Schedule of Defined Benefit Plan Amounts Recognized in Other Comprehensive Income (Loss) | Changes in plan assets and benefit obligations recognized in accumulated other comprehensive loss in the Consolidated Balance Sheets:
|  | Post-Employment Benefit Plan |
|  | Year Ended December 31, |
|  | 2018 |  | 2017 |  | 2016 |
Net actuarial gain |  | $ | 196 |  |  | $ | 261 |  |  | $ | 293 |  |
Amortization of unrecognized net actuarial loss |  | 92 |  |  | 184 |  |  | 269 |  |
Amortization of unrecognized prior service cost |  | (37 | ) |  | (339 | ) |  | (338 | ) |
Stranded tax effects from the Tax Act and Other |  | (78 | ) |  | — |  |  | — |  |
Other |  | 47 |  |  | — |  |  | — |  |
Total other comprehensive income, pre-tax |  | 220 |  |  | 106 |  |  | 224 |  |
Income tax expense |  | 73 |  |  | 40 |  |  | 90 |  |
Total other comprehensive income, net of tax |  | $ | 147 |  |  | $ | 66 |  |  | $ | 134 |  |
Schedule of Amounts Recognized in Balance Sheet | Benefit obligation recognized in the Consolidated Balance Sheets:
|  | Post-Employment Benefit Plan |
|  | As of December 31, |
Benefit obligation |  | 2018 |  | 2017 |
Current |  | $ | (467 | ) |  | $ | (471 | ) |
Non-Current |  | (2,595 | ) |  | (3,133 | ) |
Net amount recognized |  | $ | (3,062 | ) |  | $ | (3,604 | ) |
Schedule of Health Care Cost Trend Rates | The assumed average annual rate of increase in the per capita cost of covered benefits (health care cost trend rate):
| Post-Employment Benefit Plan |
| Year Ended December 31, |
| 2018 |  | 2017 |
| Group Plan |  | Lifetime Prescription Cost |  | Medicare Supplement |  | Group Plan |  | Lifetime Prescription Cost |  | Medicare Supplement |
Health care cost trend rate | 7.00 | % |  | 9.00 | % |  | 4.50 | % |  | 7.00 | % |  | 9.00 | % |  | 4.50 | % |
Ultimate trend rate | 5.00 | % |  | 5.00 | % |  | 4.50 | % |  | 5.00 | % |  | 5.00 | % |  | 4.50 | % |
Year rate reaches ultimate trend rate | 2025 |  |  | 2027 |  |  | 2019 |  |  | 2025 |  |  | 2027 |  |  | 2018 |  |
Schedule of Expected Benefit Payments | As of December 31, 2018, the following expected benefit payments (net of Medicare Part D subsidiary for Post-Employment Benefit Plan Payments) and the related expected subsidy receipts that reflect expected future service, as appropriate, are expected to be paid to plan participants:
| Post-Employment Benefit Plan |
| Expected Benefit Payments |  | Expected Subsidy Receipts |
2019 | $ | 484 |  |  | $ | 17 |  |
2020 | 468 |  |  | 15 |  |
2021 | 438 |  |  | 14 |  |
2022 | 426 |  |  | 13 |  |
2023 | 376 |  |  | 11 |  |
2024-2028 | 961 |  |  | 34 |  |
Total | $ | 3,153 |  |  | $ | 104 |  |
Schedule of Share-based Compensation, Restricted Stock and Restricted Stock Units Activity | Summary of unvested RSUs under the Company’s share-based compensation plans for 2018, 2017, and 2016:
| Year Ended December 31, |
| 2018 |  | 2017 |  | 2016 |
| Units |  | Weighted Average Grant-Date Fair Value |  | Units |  | Weighted Average Grant-Date Fair Value |  | Units |  | Weighted Average Grant-Date Fair Value |
Unvested balance at beginning of year | 368,492 |  |  | $ | 17.20 |  |  | 527,486 |  |  | $ | 10.17 |  |  | 437,946 |  |  | $ | 7.09 |  |
Granted | 42,136 |  |  | 78.37 |  |  | 47,514 |  |  | 42.93 |  |  | 100,892 |  |  | 23.15 |  |
Forfeited | (1,080 | ) |  | 28.30 |  |  | (3,508 | ) |  | 25.74 |  |  | (11,352 | ) |  | 11.55 |  |
Vested | (80,343 | ) |  | 15.42 |  |  | (203,000 | ) |  | 4.82 |  |  | — |  |  | — |  |
Unvested balance at end of year | 329,205 |  |  | $ | 25.42 |  |  | 368,492 |  |  | $ | 17.20 |  |  | 527,486 |  |  | $ | 10.17 |  |

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- Definition Tabular disclosure of one or more of the entity's defined benefit pension plans or one or more other defined benefit postretirement plans, separately for pension plans and other postretirement benefit plans including the entity's schedule of fair value of plan assets for defined benefit or other postretirement plans. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=112275985&loc=d3e4179-114921 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e2439-114920 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e2410-114920 Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e2417-114920 + Details
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