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Employee Benefit Plans (Tables) | 12 Months Ended
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Dec. 31, 2020
Employee Benefit Plans |
Schedule of funded status of retirement income plan | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
December 31, |  | 2020 |  | 2019
(in thousands) | ​ |  | ​ | ​ |  | ​
Accumulated benefit obligation at end of year | ​ | $ | 41,120 | ​ | $ | 48,519
​ | ​ | ​ | ​ | ​ | ​ | ​
CHANGE IN PROJECTED BENEFIT OBLIGATION: | ​ |  |  | ​ |  |
Benefit obligation at beginning of year | ​ | $ | 48,519 | ​ | $ | 43,417
Service cost | ​ |  | — | ​ |  | —
Interest cost | ​ |  | 1,645 | ​ |  | 1,960
Amendments | ​ |  | — | ​ |  | —
Actuarial loss | ​ |  | 3,066 | ​ |  | 5,521
Benefits paid | ​ |  | (2,581) | ​ |  | (2,379)
Settlement | ​ | ​ | (9,529) | ​ | ​ | —
Projected benefit obligation at end of year | ​ | $ | 41,120 | ​ | $ | 48,519
CHANGE IN PLAN ASSETS: | ​ |  | ​ | ​ |  | ​
Fair value of plan assets at beginning of year | ​ | $ | 40,142 | ​ | $ | 38,364
Actual return on plan assets | ​ |  | 6,586 | ​ |  | 4,157
Employer contribution | ​ |  | 4,450 | ​ |  | —
Benefits paid | ​ |  | (2,581) | ​ |  | (2,379)
Settlements | ​ | ​ | (9,529) | ​ | ​ | —
Fair value of plan assets at end of year | ​ | $ | 39,068 | ​ | $ | 40,142
Funded status at end of year | ​ | $ | (2,052) | ​ | $ | (8,377)
​
​ | ​ | ​ | ​ | ​ | ​ | ​
December 31, |  | 2020 |  | 2019
(in thousands) | ​ |  | ​ | ​ |  | ​
AMOUNTS (PRE-TAX) RECOGNIZED IN ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) CONSIST OF: |  | ​ |  |  | ​ |
Net loss | ​ | $ | 20,108 | ​ | $ | 27,693
Prior service cost (credit) | ​ |  | — | ​ |  | —
Net transition obligation (asset) | ​ |  | — | ​ |  | —
​ | ​ | $ | 20,108 | ​ | $ | 27,693
Schedule of amounts recognized in balance sheet | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
December 31, |  | 2020 |  | 2019
(in thousands) | ​ |  | ​ | ​ |  | ​
Funded status of the Retirement Income Plan | ​ | $ | (2,052) | ​ | $ | (8,377)
SERP liability | ​ |  | (31,028) | ​ |  | (30,877)
Long-term pension liabilities | ​ | $ | (33,080) | ​ | $ | (39,254)
Schedule of net periodic benefit cost | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Years ended December 31, | ​ | 2020 |  | 2019 |  | 2018
(in thousands) | ​ |  | ​ | ​ |  | ​ | ​ |  | ​
Service cost for benefits earned during the period | ​ | $ | — | ​ | $ | — | ​ | $ | —
Interest cost on projected benefit obligation | ​ | ​ | 1,645 |  | ​ | 1,960 |  | ​ | 1,832
Expected return on plan assets | ​ | ​ | (1,581) |  | ​ | (2,598) |  | ​ | (2,837)
Amortization of net loss | ​ | ​ | 986 |  | ​ | 919 |  | ​ | 824
Settlement loss | ​ | ​ | 4,660 | ​ | ​ | — | ​ | ​ | —
Net periodic benefit plan cost | ​ | $ | 5,710 | ​ | $ | 281 | ​ | $ | (181)
Schedule of amounts recognized in other comprehensive loss | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
(in thousands) |  | 2020 |  | 2019 |  | 2018
Net (gain) loss | ​ | $ | (1,217) | ​ | $ | 3,962 | ​ | $ | 2,712
Amortization of net loss | ​ | ​ | (986) | ​ | ​ | (919) | ​ | ​ | (824)
Net transition obligation (asset) |  | ​ | — |  | ​ | — |  | ​ | —
Settlement loss | ​ | ​ | (4,660) | ​ | ​ | — | ​ | ​ | —
Amount recognized in accumulated other comprehensive loss | ​ | $ | 6,863 | ​ | $ | 3,043 | ​ | $ | 1,888
Schedule of weighted average assumptions | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
December 31, |  | 2020 |  | 2019 |  | 2018 |
Projected Benefit Obligation: | ​ |  | ​ |  | ​ |  |
Discount rate | ​ | 2.50 | % | 3.60 | % | 4.65 | %
Rate of compensation increase |  | N/A |  | N/A |  | N/A | ​
Net Benefit Cost: |  |  |  |  |  |  | ​
Discount rate |  | 3.60 | % | 4.65 | % | 4.00 | %
Expected return on plan assets |  | 4.00 | % | 7.00 | % | 7.00 | %
Rate of compensation increase |  | N/A |  | N/A |  | N/A | ​
Schedule of allocation of plan assets | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | Target Allocation |  | Percentage of Plan Assets |
December 31, | ​ | 2021 | ​ | 2020 | ​ | 2019 |
Asset Category | ​ |  | ​ |  | ​ |  |
Cash and cash equivalents |  | 0% - 5 | % | 2.0 | % | 1.3 | %
Fixed income securities |  | 15% - 100 | % | 98.0 | % | 91.7 | %
Investments measured at net asset value |  | — | % | — | % | 7.0 | %
Total |  | 100.0 | % | 100.0 | % | 100.0 | %
Schedule of level three defined benefit plan assets | Fair Value Hierarchy as of December 31, 2020: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Investments (in thousands) |  | ​ |  | Total |  | Level 1 |  | Level 2
Cash and Cash Equivalents | ​ | (1) | ​ | $ | 736 | ​ | $ | 736 | ​ | $ | —
Fixed Income Securities | ​ | (2) | ​ | ​ | 38,332 | ​ | ​ | — | ​ | ​ | 38,332
Total Assets in the Fair Value Hierarchy | ​ | ​ | ​ | $ | 39,068 | ​ | $ | 736 | ​ | $ | 38,332
Investments measured at Net Asset Value | ​ |  | ​ |  | — | ​ | ​ |  |  |  |
Investments at Fair Value | ​ | ​ | ​ | $ | 39,068 | ​ | ​ |  |  |  |
​ Fair Value Hierarchy as of December 31, 2019: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Investments (in thousands) |  | ​ |  | Total |  | Level 1 | ​ | Level 2
Cash and Cash Equivalents | ​ | (1) | ​ | $ | 505 | ​ | $ | 505 | ​ | $ | —
Fixed Income Securities | ​ | (2) | ​ | ​ | 36,813 | ​ | ​ | — | ​ | ​ | 36,813
Domestic Equity Securities | ​ | (3) | ​ | ​ | 3 | ​ | ​ | 3 | ​ | ​ | —
Total Assets in the Fair Value Hierarchy | ​ | ​ | ​ | $ | 37,321 | ​ | $ | 508 | ​ | $ | 36,813
Investments measured at Net Asset Value | ​ | ​ | ​ |  | 2,821 |  | ​ |  |  |  |
Investments at Fair Value | ​ | ​ | ​ | $ | 40,142 |  | ​ |  |  |  |
​
| (1) | Cash and cash equivalents, which are used to pay benefits and plan administrative expenses, are held in Rule 2a-7 money market funds.
| (2) | Fixed income securities are primarily valued using a market approach with inputs that include broker quotes, benchmark yields, base spreads and reported trades.
| (3) | Domestic equity securities are valued using a market approach based on the quoted market prices of identical instruments in their respective markets.
Schedule of future benefits payable for the retirement income plan over the next ten years | ​
​ | ​ | ​ | ​
(in thousands) |  | ​ | ​
2021 | ​ | $ | 2,688
2022 |  | ​ | 2,646
2023 |  | ​ | 2,615
2024 |  | ​ | 2,614
2025 |  | ​ | 2,587
2026‑2030 | ​ | $ | 12,112
Schedule of summary of the changes in non-vested restricted shares | The following is a summary of the changes in non-vested restricted shares for the year ended December 31, 2020: ​
​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | Weighted Average
​ |  | Shares |  | Grant-Date Fair Value
Non-vested shares at January 1, 2020 | ​ | 2,393,557 | ​ | $ | 13.23
Granted |  | 1,085,875 |  | ​ | 4.59
Vested |  | (875,202) |  | ​ | 14.96
Forfeited |  | (369,051) |  | ​ | 13.60
Non-vested shares at December 31, 2020 |  | 2,235,179 | ​ | $ | 6.81
​ The following is a summary of the changes in non-vested restricted shares for the year ended December 31, 2019: ​
​ | ​ | ​ | ​ | ​ | ​
​ |  | ​ | ​ | Weighted Average
​ |  | Shares |  | Grant-Date Fair Value
Non-vested shares at January 1, 2019 | ​ | 2,352,150 | ​ | $ | 17.15
Granted |  | 858,150 |  | ​ | 11.39
Vested |  | (625,465) | ​ | ​ | 14.73
Forfeited |  | (191,278) |  | ​ | 15.90
Non-vested shares at December 31, 2019 |  | 2,393,557 | ​ | $ | 13.23

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