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Employee Benefit Plans (Tables) | 12 Months Ended
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Dec. 31, 2015
Employee Benefit Plans [Abstract] |
Summary of Net Periodic Benefit Cost |
| Year Ended December 31, |
(in thousands) | 2015 |  | 2014 |  | 2013
Interest cost | $ | 4,055 |  |  | $ | 4,144 |  |  | $ | 3,710 |
Expected return on plan assets |  | (5,021) |  |  |  | (4,797) |  |  |  | (4,509) |
Recognized net actuarial losses |  | 1,869 |  |  |  | 4,385 |  |  |  | 6,330 |
Net periodic benefit cost | $ | 903 |  |  | $ | 3,732 |  |  | $ | 5,531 |
Actuarial assumptions used to determine net cost: |  |  |  |  |  |  |  |  |  |  |
Discount rate |  | 3.75 | % |  |  | 4.47 | % |  |  | 3.58 | %
Expected return on assets |  | 6.50 | % |  |  | 6.75 | % |  |  | 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 |  | 2016 |  |  | 2015 |  |  | 2014
Cash |  | 5 | % |  |  | 4 | % |  |  | 6 | %
Equity securities: |  |  |  |  |  |  |  |  |  |  |
Domestic |  | 65 |  |  |  | 61 |  |  |  | 63 |
International |  | 25 |  |  |  | 30 |  |  |  | 26 |
Fixed income securities |  | 5 |  |  |  | 5 |  |  |  | 5 |
Total |  | 100 | % |  |  | 100 | % |  |  | 100 | %
Future Benefit Payments Under the Plans |
Year ended December 31, | (in thousands)
2016 | $ | 6,399
2017 |  | 6,439
2018 |  | 6,601
2019 |  | 6,687
2020 |  | 6,720
Thereafter |  | 33,510
| $ | 66,356
Reconciliation of Changes in Fair Value of Plan Assets, Plan Benefit Obligations and Funded Status |
| Year Ended December 31,
(in thousands) | 2015 |  | 2014
Change in Fair Value of Plan Assets |  |  |  |  |
Balance at beginning of year | $ | 75,956 |  | $ | 72,617
Actual return on plan assets |  | (984) |  |  | 3,711
Company contribution |  | 2,900 |  |  | 5,213
Benefit payments |  | (5,576) |  |  | (5,585)
Balance at end of year | $ | 72,296 |  | $ | 75,956
| Year Ended December 31,
(in thousands) | 2015 |  | 2014
Change in Benefit Obligations |  |  |  |  |
Balance at beginning of year | $ | 110,923 |  | $ | 95,178
Interest cost |  | 4,055 |  |  | 4,144
Assumption change (gain) loss |  | (3,838) |  |  | 17,054
Actuarial loss |  | 378 |  |  | 132
Benefit payments |  | (5,576) |  |  | (5,585)
Balance at end of year | $ | 105,942 |  | $ | 110,923
Net Amount Recognized in Consolidated Balance Sheets |
| As of December 31,
(in thousands) | 2015 |  | 2014
Funded status | $ | (33,646) |  | $ | (34,967)
Amounts recognized in Consolidated Balance Sheets consist of: |  |  |  |  |
Current liabilities | $ | (218) |  | $ | (218)
Long-term liabilities |  | (33,428) |  |  | (34,749)
Net amount recognized in Consolidated Balance Sheets | $ | (33,646) |  | $ | (34,967)
Amounts Not Yet Reflected in Net Periodic Benefit Cost and Included in Accumulated Other Comprehensive Loss |
| Year Ended December 31,
(in thousands) | 2015 |  | 2014
Amounts not yet reflected in net periodic benefit cost and included in accumulated other comprehensive loss: |  |  |  |  |
Net actuarial loss | $ | (56,824) |  | $ | (56,147)
Accumulated other comprehensive loss |  | (56,824) |  |  | (56,147)
Cumulative Company contributions in excess of net periodic benefit cost |  | 23,178 |  |  | 21,180
Net amount recognized in Consolidated Balance Sheets | $ | (33,646) |  | $ | (34,967)
Actuarial Assumptions Used to Determine Benefit Obligation |
| Year Ended December 31,
| 2015 |  | 2014
Actuarial assumptions used to determine benefit obligation: |  |  |  |  |
Discount rate | 4.10 | % |  | 3.75 | %
Rate of increase in compensation | n.a. |  |  | n.a. |
Measurement date | December 31 |  |  | December 31 |
Plan Assets at Fair Value |
| As of December 31, 2015 |  | As of December 31, 2014
| Fair Value Hierarchy |  | Fair Value Hierarchy
(in thousands) | Level 1 |  | Level 2 |  | Level 3 |  | Total Value |  | Level 1 |  | Level 2 |  | Level 3 |  | Total Value
Cash and cash equivalents | $ | 2,654 |  | $ | — |  | $ | — |  | $ | 2,654 |  | $ | 4,693 |  | $ | — |  | $ | — |  | $ | 4,693
Fixed Income |  | 4,029 |  |  | — |  |  | — |  |  | 4,029 |  |  | 3,824 |  |  | — |  |  | — |  |  | 3,824
Equities |  | 6,566 |  |  | — |  |  | — |  |  | 6,566 |  |  | 7,676 |  |  | — |  |  | — |  |  | 7,676
Mutual Funds |  | 6,994 |  |  | — |  |  | — |  |  | 6,994 |  |  | 6,550 |  |  | — |  |  | — |  |  | 6,550
Equity Partnerships |  | — |  |  | 7,920 |  |  | — |  |  | 7,920 |  |  | — |  |  | 7,723 |  |  | — |  |  | 7,723
Hedge Fund Investments: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash |  | 324 |  |  | — |  |  | — |  |  | 324 |  |  | 1,010 |  |  | — |  |  | — |  |  | 1,010
Long-Short Equity Fund |  | — |  |  | 12,640 |  |  | 16,370 |  |  | 29,010 |  |  | — |  |  | 15,878 |  |  | 12,755 |  |  | 28,633
Event-Driven Fund |  | — |  |  | 3,618 |  |  | 6,984 |  |  | 10,602 |  |  | — |  |  | 3,471 |  |  | 9,562 |  |  | 13,033
Distressed Credit |  | — |  |  | — |  |  | 935 |  |  | 935 |  |  | — |  |  | — |  |  | 1,320 |  |  | 1,320
Multi-Strategy Fund |  | — |  |  | — |  |  | 1,262 |  |  | 1,262 |  |  | — |  |  | — |  |  | 1,494 |  |  | 1,494
Private Credit |  | — |  |  | — |  |  | 2,000 |  |  | 2,000 |  |  | — |  |  | — |  |  | — |  |  | —
Total | $ | 20,567 |  | $ | 24,178 |  | $ | 27,551 |  | $ | 72,296 |  | $ | 23,753 |  | $ | 27,072 |  | $ | 25,131 |  | $ | 75,956
Summary of Changes in Fair Value of Level 3 Plan Assets |
| Changes in Fair Value of Level 3 Assets
| Long-Short |  | Event-Driven |  | Distressed |  | Multi-Strategy |  |  |  |  |
(in thousands) | Equity Fund |  | Fund |  | Credit |  | Fund |  | Private Credit |  | Total
Balance, December 31, 2013 | $ | 10,863 |  | $ | 8,863 |  | $ | 2,199 |  | $ | 1,799 |  | $ | — |  | $ | 23,724
Realized gains |  | — |  |  | — |  |  | 13 |  |  | 3 |  |  | — |  |  | 16
Unrealized gains |  | 843 |  |  | 505 |  |  | 57 |  |  | 59 |  |  | — |  |  | 1,464
Purchases |  | 1,049 |  |  | 16 |  |  | 5 |  |  | 6 |  |  | — |  |  | 1,076
Sales |  | — |  |  | (2,512) |  |  | (954) |  |  | (373) |  |  | — |  |  | (3,839)
Reclassified to Level 3 (a) |  | — |  |  | 2,690 |  |  | — |  |  | — |  |  | — |  |  | 2,690
Balance, December 31, 2014 | $ | 12,755 |  | $ | 9,562 |  | $ | 1,320 |  | $ | 1,494 |  | $ | — |  | $ | 25,131
Realized gains |  | (50) |  |  | (16) |  |  | (7) |  |  | (9) |  |  | — |  |  | (82)
Unrealized gains |  | 581 |  |  | (585) |  |  | (28) |  |  | (38) |  |  | — |  |  | (70)
Purchases |  | 5,631 |  |  | — |  |  | — |  |  | 225 |  |  | 2,642 |  |  | 8,498
Sales |  | (2,547) |  |  | (1,977) |  |  | (350) |  |  | (410) |  |  | (642) |  |  | (5,926)
Balance, December 31, 2015 | $ | 16,370 |  | $ | 6,984 |  | $ | 935 |  | $ | 1,262 |  | $ | 2,000 |  | $ | 27,551
| (a) |  | The transfer of $2.7 million from Level 2 to Level 3 was comprised of certain hedge funds that were moved due to liquidity.
Benefit Obligations in Excess of Fair Value of Plans' Assets |
| As of December 31, 2015 |  | As of December 31, 2014
|  |  |  | Benefit |  |  |  |  |  |  |  | Benefit |  |  |
| Pension |  | Equalization |  |  |  |  | Pension |  | Equalization |  |  |
(in thousands) | Plan |  | Plan |  | Total |  | Plan |  | Plan |  | Total
Projected benefit obligation | $ | 102,495 |  | $ | 3,447 |  | $ | 105,942 |  | $ | 107,570 |  | $ | 3,353 |  | $ | 110,923
Accumulated benefit obligation |  | 102,495 |  |  | 3,447 |  |  | 105,942 |  |  | 107,570 |  |  | 3,353 |  |  | 110,923
Fair value of plan assets |  | 72,296 |  |  | — |  |  | 72,296 |  |  | 75,956 |  |  | — |  |  | 75,956
Projected benefit obligation greater than fair value of plan assets | $ | 30,199 |  | $ | 3,447 |  | $ | 33,646 |  | $ | 31,614 |  | $ | 3,353 |  | $ | 34,967
Accumulated benefit obligation greater than fair value of plan assets | $ | 30,199 |  | $ | 3,447 |  | $ | 33,646 |  | $ | 31,614 |  | $ | 3,353 |  | $ | 34,967
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 |  | 2015 |  | 2014 |  | Implemented |  | 2015 |  | 2014 |  | 2013 |  | Imposed |  | Agreement
Pension, Hospitalization and Benefit Plan of the Electrical Industry - Pension Trust Account |  | 13-6123601/001 |  | Green |  | Green |  | No |  | 13.6 | (a) |  | 11.8 | (a) |  | 13.4 | (a) |  | No |  | 5/31/2016
Steamfitters Industry Pension Fund |  | 13-6149680/001 |  | Green |  | Yellow |  | No |  | 6.2 | (a) |  | 5.1 | (a) |  | 4.3 | (a) |  | No |  | 6/30/2017
Excavators Union Local 731 Pension Fund |  | 13-1809825/002 |  | Green |  | Green |  | No |  | 7.1 |  |  | 5.3 |  |  | 3.2 |  |  | No |  | 6/30/2016
Local 147 Construction Workers Retirement Fund |  | 13-6528181 |  | Green |  | Green |  | No |  | 5.6 | (a) |  | 1.3 |  |  | 0.2 |  |  | No |  | 6/30/2018
Iron Workers Locals 40,361 & 417 Pension Fund |  | 51-6102576/001 |  | Yellow |  | Yellow |  | Implemented |  | 5.2 | (a) |  | 0.7 |  |  | 0.5 |  |  | No |  | 6/30/2020
New York City District Council of Carpenters Pension Plan |  | 51-0174276/001 |  | Green (b) |  | Green |  | No |  | 3.1 |  |  | 2.6 |  |  | 1.6 |  |  | No |  | 6/30/2016
| (a) |  | These amounts exceeded 5% of the respective total plan contributions.
| (b) |  | Pension Protection Act zone status is as of July 1, 2015 and 2014, respectively.

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