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Employee Benefit Plans (Tables) | 12 Months Ended
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Dec. 31, 2018
Employee Benefit Plans [Abstract] |
Summary of Net Periodic Benefit Cost |
﻿ |  |  |  |  |  |  |  |  |  |  |
﻿ |  |  |  |  |  |  |  |  |  |  |
﻿ | Year Ended December 31,
﻿(in thousands) | 2018 |  |  | 2017 |  |  | 2016 |
﻿Interest cost | $ | 3,496 |  |  | $ | 3,919 |  |  | $ | 4,153 |
﻿Service cost |  | 875 |  |  |  | 850 |  |  |  | 600 |
﻿Expected return on plan assets |  | (4,302) |  |  |  | (4,358) |  |  |  | (4,803) |
﻿Recognized net actuarial losses |  | 2,067 |  |  |  | 1,897 |  |  |  | 1,745 |
﻿Net periodic benefit cost | $ | 2,136 |  |  | $ | 2,308 |  |  | $ | 1,695 |
﻿Actuarial assumptions used to determine net cost: |  |  |  |  |  |  |  |  |  |  |
﻿Discount rate |  | 3.45 | % |  |  | 3.90 | % |  |  | 4.10 | %
﻿Expected return on assets |  | 6.00 | % |  |  | 6.00 | % |  |  | 6.00 | %
﻿Rate of increase in compensation |  | N/A |  |  |  | N/A |  |  |  | N/A |
﻿
Target and Actual Asset Allocation for Pension Plan by Asset Category |
﻿ |  |  |  |  |  |  |  |  |  |  |
﻿ |  |  |  |  |  |  |  |  |  |  |
﻿ |  | Percentage of Plan Assets as of December 31,
﻿ |  | Target |  |  |
﻿ |  | Allocation |  |  | Actual Allocation
﻿Asset Category |  | 2019 |  |  | 2018 |  |  | 2017
﻿Cash |  | 5 | % |  |  | 3 | % |  |  | 3 | %
﻿Equity funds: |  |  |  |  |  |  |  |  |  |  |
﻿Domestic |  | 45 |  |  |  | 50 |  |  |  | 41 |
﻿International |  | 20 |  |  |  | 27 |  |  |  | 31 |
﻿Fixed income funds |  | 30 |  |  |  | 20 |  |  |  | 25 |
﻿Total |  | 100 | % |  |  | 100 | % |  |  | 100 | %
﻿
Future Benefit Payments Under the Plans |
﻿ |  |
﻿ |  |
﻿(in thousands) |  |
﻿Year ended December 31, |
﻿2019 | $ | 6,810
﻿2020 |  | 6,779
﻿2021 |  | 6,729
﻿2022 |  | 6,669
﻿2023 |  | 6,590
﻿2024-2028 |  | 31,752
﻿Total | $ | 65,329
﻿
Reconciliation of Changes in Fair Value of Plan Assets, Plan Benefit Obligations and Funded Status |
﻿ |  |  |  |  |
﻿ |  |  |  |  |
﻿ | Year Ended December 31,
﻿(in thousands) | 2018 |  | 2017
﻿Change in Fair Value of Plan Assets |  |  |  |  |
﻿Balance at beginning of year | $ | 71,541 |  | $ | 66,057
﻿Actual return on plan assets |  | (4,758) |  |  | 9,224
﻿Company contribution |  | 2,975 |  |  | 2,838
﻿Benefit payments |  | (6,649) |  |  | (6,578)
﻿Balance at end of year | $ | 63,109 |  | $ | 71,541
﻿ ﻿
﻿ |  |  |  |  |
﻿ |  |  |  |  |
﻿ | Year Ended December 31,
﻿(in thousands) | 2018 |  | 2017
﻿Change in Benefit Obligations |  |  |  |  |
﻿Balance at beginning of year | $ | 106,218 |  | $ | 103,681
﻿Interest cost |  | 3,496 |  |  | 3,919
﻿Service cost |  | 875 |  |  | 850
﻿Assumption change (gain) loss |  | (7,056) |  |  | 3,854
﻿Actuarial (gain) loss |  | (1,014) |  |  | 492
﻿Benefit payments |  | (6,650) |  |  | (6,578)
﻿Balance at end of year | $ | 95,869 |  | $ | 106,218
﻿
Net Amount Recognized in Consolidated Balance Sheets |
﻿ |  |  |  |  |
﻿ |  |  |  |  |
﻿ | As of December 31,
﻿(in thousands) | 2018 |  | 2017
﻿Funded status | $ | (32,760) |  | $ | (34,677)
﻿Net unfunded amounts recognized in Consolidated Balance Sheets consist of: |  |  |  |  |
﻿Current liabilities | $ | (262) |  | $ | (279)
﻿Long-term liabilities |  | (32,498) |  |  | (34,398)
﻿Total net unfunded amount recognized in Consolidated Balance Sheets | $ | (32,760) |  | $ | (34,677)
﻿
Plan Assets at Fair Value | ﻿
﻿ |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
﻿ |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
﻿ | As of December 31, 2018 |  | As of December 31, 2017
﻿ | Fair Value Hierarchy |  |  |  |  | Fair Value Hierarchy |  |  |
﻿(in thousands) | Level 1 |  | Level 2 |  | Level 3 |  | Total |  | Level 1 |  | Level 2 |  | Level 3 |  |  | Total
﻿Cash and cash equivalents | $ | 7,587 |  | $ | — |  | $ | — |  | $ | 7,587 |  | $ | 2,390 |  | $ | — |  | $ | — |  | $ | 2,390
﻿Fixed income funds |  | — |  |  | 2,585 |  |  | — |  |  | 2,585 |  |  | 18,031 |  |  | — |  |  | — |  |  | 18,031
﻿Equity funds |  | 36,436 |  |  | — |  |  | — |  |  | 36,436 |  |  | 20,372 |  |  | — |  |  | — |  |  | 20,372
﻿ | $ | 44,023 |  | $ | 2,585 |  | $ | — |  | $ | 46,608 |  | $ | 40,793 |  | $ | — |  | $ | — |  | $ | 40,793
﻿Closely held funds(a) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
﻿Equity partnerships |  |  |  |  |  |  |  |  |  |  | 5,580 |  |  |  |  |  |  |  |  |  |  |  | 8,711
﻿Hedge fund investments |  |  |  |  |  |  |  |  |  |  | 10,921 |  |  |  |  |  |  |  |  |  |  |  | 22,037
﻿Total closely held funds(a) |  |  |  |  |  |  |  |  |  |  | 16,501 |  |  |  |  |  |  |  |  |  |  |  | 30,748
﻿Total | $ | 44,023 |  | $ | 2,585 |  | $ | — |  | $ | 63,109 |  | $ | 40,793 |  | $ | — |  | $ | — |  | $ | 71,541
| (a) |  | Closely held funds in private investment were comprised of a combination of Level 1, 2 and 3 investments, but were not categorized in the fair value hierarchy because they were measured at NAV using the practical expedient under ASC 820, Fair Value Measurement (“ASC 820”).
Benefit Obligations in Excess of Fair Value of Plans' Assets |
﻿ |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
﻿ |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
﻿ | As of December 31, 2018 |  | As of December 31, 2017
﻿ |  |  |  | Benefit |  |  |  |  |  |  |  | Benefit |  |  |
﻿ | Pension |  | Equalization |  |  |  |  | Pension |  | Equalization |  |  |
﻿(in thousands) | Plan |  | Plan |  | Total |  | Plan |  | Plan |  | Total
﻿Projected benefit obligation | $ | 92,816 |  | $ | 3,053 |  | $ | 95,869 |  | $ | 102,806 |  | $ | 3,412 |  | $ | 106,218
﻿Accumulated benefit obligation | $ | 92,816 |  | $ | 3,053 |  | $ | 95,869 |  | $ | 102,806 |  | $ | 3,412 |  | $ | 106,218
﻿Fair value of plans' assets |  | 63,109 |  |  | — |  |  | 63,109 |  |  | 71,541 |  |  | — |  |  | 71,541
﻿Projected benefit obligation greater than fair value of plans' assets | $ | 29,707 |  | $ | 3,053 |  | $ | 32,760 |  | $ | 31,265 |  | $ | 3,412 |  | $ | 34,677
﻿Accumulated benefit obligation greater than fair value of plans' assets | $ | 29,707 |  | $ | 3,053 |  | $ | 32,760 |  | $ | 31,265 |  | $ | 3,412 |  | $ | 34,677
﻿
Key Information for the Plans | ﻿ ﻿
﻿ |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
﻿ |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
﻿ |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | Expiration
﻿ |  |  |  |  |  |  |  | FIP/RP |  |  |  |  |  |  |  |  |  |  |  |  |  | Date of
﻿ |  |  |  | Pension Protections Act |  | Status |  | Company Contributions |  |  |  | Collective
﻿ |  | EIN/Pension |  | Zone Status |  | Pending Or |  | (amounts in millions)(b) |  | Surcharge |  | Bargaining
﻿Pension Fund |  | Plan Number |  | 2018 |  | 2017 |  | Implemented |  |  | 2018 |  | 2017 |  | 2016 |  | Imposed |  | Agreement
﻿The Pension, Hospitalization and Benefit Plan of the Electrical Industry - Pension Trust Fund |  | 13-6123601/001 |  | Green |  | Green |  | N/A |  | $ | 12.2 |  | $ | 16.0 |  | $ | 15.8 | (a) |  | No |  | 4/30/2019
﻿Carpenters Pension Trust Fund for Northern California |  | 94-6050970 |  | Red |  | Red |  | Implemented |  |  | 4.9 |  |  | 8.2 |  |  | 4.4 |  |  | No |  | 6/30/2019
﻿Excavators Union Local 731 Pension Fund |  | 13-1809825/002 |  | Green |  | Green |  | N/A |  |  | 4.1 |  |  | 4.3 |  |  | 4.2 |  |  | No |  | 4/30/2022
﻿Northern California Electrical Workers Pension Plan |  | 94-6062674 |  | Green |  | Green |  | N/A |  |  | 4.1 |  |  | 5.2 |  |  | 1.5 |  |  | No |  | 5/31/2022
﻿Laborers Pension Trust Fund for Northern California |  | 94-6277608 |  | Green |  | Yellow |  | N/A |  |  | 3.8 |  |  | 6.6 |  |  | 5.6 |  |  | No |  | 6/30/2019
﻿Steamfitters Industry Pension Fund |  | 13-6149680/001 |  | Green |  | Green |  | N/A |  |  | 3.5 |  |  | 3.9 | (a) |  | 3.9 | (a) |  | No |  | 6/30/2020
_____________________________________________________________________________________________________________ ﻿
| (a) |  | These amounts exceeded 5% of the respective total plan contributions.
| (b) |  | The Company's contributions as a percentage of total plan contributions were not available for the 2018 plan year for any of the above pension funds nor the 2017 plan year for The Pension, Hospitalization and Benefit Plan of the Electrical Industry - Pension Trust Fund.

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- Definition Tabular disclosure of the fair value of each major category of plan assets, and the level within the fair value hierarchy in which the fair value measurements fall of pension plans and/or other employee benefit plans. + References No definition available. + Details
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