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Employee Benefit Plans (Tables) | 12 Months Ended
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Dec. 31, 2016
Employee Benefit Plans [Abstract] |
Summary of Net Periodic Benefit Cost |
﻿ |  |  |  |  |  |  |  |  |  |  |
﻿ |  |  |  |  |  |  |  |  |  |  |
﻿ | Year Ended December 31, |
﻿(in thousands) | 2016 |  |  | 2015 |  |  | 2014 |
﻿Interest cost | $ | 4,153 |  |  | $ | 4,055 |  |  | $ | 4,144 |
﻿Service cost |  | 600 |  |  |  | — |  |  |  | — |
﻿Expected return on plan assets |  | (4,803) |  |  |  | (5,021) |  |  |  | (4,797) |
﻿Recognized net actuarial losses |  | 1,745 |  |  |  | 1,869 |  |  |  | 4,385 |
﻿Net periodic benefit cost | $ | 1,695 |  |  | $ | 903 |  |  | $ | 3,732 |
﻿Actuarial assumptions used to determine net cost: |  |  |  |  |  |  |  |  |  |  |
﻿Discount rate |  | 4.10 | % |  |  | 3.75 | % |  |  | 4.47 | %
﻿Expected return on assets |  | 6.00 | % |  |  | 6.50 | % |  |  | 6.75 | %
﻿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 |  | 2017 |  |  | 2016 |  |  | 2015
﻿Cash |  | 5 | % |  |  | 4 | % |  |  | 4 | %
﻿Equity securities: |  |  |  |  |  |  |  |  |  |  |
﻿Domestic |  | 50 |  |  |  | 47 |  |  |  | 61 |
﻿International |  | 25 |  |  |  | 28 |  |  |  | 30 |
﻿Fixed income securities |  | 20 |  |  |  | 21 |  |  |  | 5 |
﻿Total |  | 100 | % |  |  | 100 | % |  |  | 100 | %
﻿
Future Benefit Payments Under the Plans |
﻿ |  |
﻿ |  |
﻿Year ended December 31, |
﻿(in thousands) |  |
﻿2017 | $ | 6,488
﻿2018 |  | 6,632
﻿2019 |  | 6,691
﻿2020 |  | 6,717
﻿2021 |  | 6,732
﻿Thereafter |  | 32,722
﻿Total | $ | 65,982
﻿
Reconciliation of Changes in Fair Value of Plan Assets, Plan Benefit Obligations and Funded Status |
﻿ |  |  |  |  |
﻿ |  |  |  |  |
﻿ | Year Ended December 31,
﻿(in thousands) | 2016 |  | 2015
﻿Change in Fair Value of Plan Assets |  |  |  |  |
﻿Balance at beginning of year | $ | 72,296 |  | $ | 75,956
﻿Actual return on plan assets |  | (1,909) |  |  | (984)
﻿Company contribution |  | 2,025 |  |  | 2,900
﻿Benefit payments |  | (6,355) |  |  | (5,576)
﻿Balance at end of year | $ | 66,057 |  | $ | 72,296
﻿ ﻿
﻿ |  |  |  |  |
﻿ |  |  |  |  |
﻿ | Year Ended December 31,
﻿(in thousands) | 2016 |  | 2015
﻿Change in Benefit Obligations |  |  |  |  |
﻿Balance at beginning of year | $ | 105,942 |  | $ | 110,923
﻿Interest cost |  | 4,153 |  |  | 4,055
﻿Service cost |  | 600 |  |  | —
﻿Assumption change (gain) loss |  | 308 |  |  | (3,838)
﻿Actuarial (gain) loss |  | (967) |  |  | 378
﻿Benefit payments |  | (6,355) |  |  | (5,576)
﻿Balance at end of year | $ | 103,681 |  | $ | 105,942
﻿
Net Amount Recognized in Consolidated Balance Sheets |
﻿ |  |  |  |  |
﻿ |  |  |  |  |
﻿ | As of December 31,
﻿(in thousands) | 2016 |  | 2015
﻿Funded status | $ | (37,624) |  | $ | (33,646)
﻿Amounts recognized in Consolidated Balance Sheets consist of: |  |  |  |  |
﻿Current liabilities | $ | (271) |  | $ | (218)
﻿Long-term liabilities |  | (37,353) |  |  | (33,428)
﻿Net amount recognized in Consolidated Balance Sheets | $ | (37,624) |  | $ | (33,646)
﻿
Amounts Not Yet Reflected in Net Periodic Benefit Cost and Included in Accumulated Other Comprehensive Loss |
﻿ |  |  |  |  |
﻿ |  |  |  |  |
﻿ | Year Ended December 31,
﻿(in thousands) | 2016 |  | 2015
﻿Amounts not yet reflected in net periodic benefit cost and included in accumulated other comprehensive loss |  |  |  |  |
﻿Net actuarial loss | $ | (61,132) |  | $ | (56,824)
﻿Cumulative Company contributions in excess of net periodic benefit cost |  | 23,508 |  |  | 23,178
﻿Net amount recognized in Consolidated Balance Sheets | $ | (37,624) |  | $ | (33,646)
﻿
Plan Assets at Fair Value | ﻿
﻿ |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
﻿ |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
﻿ | As of December 31, 2016 |  | As of December 31, 2015
﻿ | Fair Value Hierarchy |  | Fair Value Hierarchy
﻿(in thousands) | Total |  | Level 1 |  | Level 2 |  | Level 3 |  | Total |  | Level 1 |  | Level 2 |  | Level 3
﻿Cash and cash equivalents | $ | 2,437 |  | $ | 2,437 |  | $ | — |  | $ | — |  | $ | 2,654 |  | $ | 2,654 |  | $ | — |  | $ | —
﻿Fixed Income |  | 14,023 |  |  | 14,023 |  |  | — |  |  | — |  |  | 4,029 |  |  | 4,029 |  |  | — |  |  | —
﻿Equities |  | — |  |  | — |  |  | — |  |  | — |  |  | 6,566 |  |  | 6,566 |  |  | — |  |  | —
﻿Mutual Funds |  | 10,489 |  |  | 10,489 |  |  | — |  |  | — |  |  | 6,994 |  |  | 6,994 |  |  | — |  |  | —
﻿ | $ | 26,949 |  | $ | 26,949 |  | $ | — |  | $ | — |  | $ | 20,243 |  | $ | 20,243 |  | $ | — |  | $ | —
﻿Closely held funds(a) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
﻿Equity Partnerships |  | 6,931 |  |  |  |  |  |  |  |  |  |  |  | 7,920 |  |  |  |  |  |  |  |  |
﻿Hedge Fund Investments |  | 32,177 |  |  |  |  |  |  |  |  |  |  |  | 44,133 |  |  |  |  |  |  |  |  |
﻿Total closely held funds(a) |  | 39,108 |  |  |  |  |  |  |  |  |  |  |  | 52,053 |  |  |  |  |  |  |  |  |
﻿Total | $ | 66,057 |  | $ | 26,949 |  | $ | — |  | $ | — |  | $ | 72,296 |  | $ | 20,243 |  | $ | — |  | $ | —
﻿ ﻿
| (a) |  | Closely held funds in private investment were measured at fair value using NAV and were not categorized in the fair value hierarchy. Although the investments were not categorized within the fair value hierarchy, the holdings of these private investment funds 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. This is a change from prior years’ presentation as there is no longer a requirement to categorize within the fair value hierarchy all investments for which fair value is measured using the NAV per share practical expedient.
Benefit Obligations in Excess of Fair Value of Plans' Assets |
﻿ |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
﻿ |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
﻿ | As of December 31, 2016 |  | As of December 31, 2015
﻿ |  |  |  | Benefit |  |  |  |  |  |  |  | Benefit |  |  |
﻿ | Pension |  | Equalization |  |  |  |  | Pension |  | Equalization |  |  |
﻿(in thousands) | Plan |  | Plan |  | Total |  | Plan |  | Plan |  | Total
﻿Projected benefit obligation | $ | 100,336 |  | $ | 3,345 |  | $ | 103,681 |  | $ | 102,495 |  | $ | 3,447 |  | $ | 105,942
﻿Accumulated benefit obligation |  | 100,336 |  |  | 3,345 |  |  | 103,681 |  |  | 102,495 |  |  | 3,447 |  |  | 105,942
﻿Fair value of plans' assets |  | 66,057 |  |  | — |  |  | 66,057 |  |  | 72,296 |  |  | — |  |  | 72,296
﻿Projected benefit obligation greater than fair value of plans' assets | $ | 34,279 |  | $ | 3,345 |  | $ | 37,624 |  | $ | 30,199 |  | $ | 3,447 |  | $ | 33,646
﻿Accumulated benefit obligation greater than fair value of plans' assets | $ | 34,279 |  | $ | 3,345 |  | $ | 37,624 |  | $ | 30,199 |  | $ | 3,447 |  | $ | 33,646
﻿
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) |  | Surcharge |  | Bargaining
﻿Pension Fund |  | Plan Number |  | 2016 |  | 2015 |  | Implemented |  | 2016 (b) |  | 2015 |  | 2014 |  | Imposed |  | Agreement
﻿The Pension, Hospitalization and Benefit Plan of the Electrical Industry - Pension Trust Fund |  | 13-6123601/001 |  | Green |  | Green |  | N/A |  | $ 15.8 |  |  | $ 13.6 | (a) |  | $ 11.8 | (a) |  | No |  | 5/31/2019
﻿Laborers Pension Trust Fund for Northern California |  | 94-6277608 |  | Yellow |  | Yellow |  | Implemented |  | 5.6 |  |  | 2.8 |  |  | 1.9 |  |  | No |  | 6/30/2019
﻿Carpenters Pension Trust Fund for Northern California |  | 94-6050970 |  | Red |  | Red |  | Implemented |  | 4.4 |  |  | 2.7 |  |  | 1.9 |  |  | No |  | 6/30/2019
﻿Excavators Union Local 731 Pension Fund |  | 13-1809825/002 |  | Green |  | Green |  | N/A |  | 4.2 |  |  | 7.1 |  |  | 5.3 |  |  | No |  | 4/30/2022
﻿Steamfitters Industry Pension Fund |  | 13-6149680/001 |  | Green |  | Green |  | N/A |  | 3.9 |  |  | 6.2 | (a) |  | 5.1 | (a) |  | No |  | 6/30/2017
﻿Iron Workers Locals 40,361 & 417 Pension Fund |  | 51-6102576/001 |  | Green |  | Yellow |  | Implemented |  | 3.8 |  |  | 5.2 | (a) |  | 0.7 |  |  | No |  | 6/30/2020
﻿Local 147 Construction Workers Retirement Fund |  | 13-6528181 |  | Green |  | Green |  | N/A |  | 3.7 |  |  | 5.6 | (a) |  | 1.3 |  |  | No |  | 6/30/2018
﻿Southern California Gunite Workers Pension Fund |  | 95-4354179 |  | Green |  | Green |  | N/A |  | 3.5 |  |  | 0.7 |  |  | 0.7 |  |  | No |  | 6/30/2019
| (a) |  | These amounts exceeded 5% of the respective total plan contributions.
The Company's contributions as a percentage of total plan contributions were not available for any of our plans.

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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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- Definition Tabular disclosure of the quantitative and qualitative information related to multiemployer plans in which the employer participates. A multiemployer plan is a pension or postretirement benefit plan to which two or more unrelated employers contribute where assets contributed by one participating employer may be used to provide benefits to employees of other participating employers. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 80 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=49170332&loc=SL14450657-114947 + Details
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