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Retirement Plans (Tables) | 12 Months Ended
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Dec. 31, 2015
Compensation and Retirement Disclosure [Abstract] |
Schedule of Changes in Benefit Obligations and Assets | The change in benefit obligations and assets of the UK Plan for the years ended December 31, 2015 and 2014 consisted of the following components (in thousands):
| 2015 |  | 2014
Change in pension benefit obligation |  |  |
Benefit obligation at beginning of year | $ | 332,806 |  |  | $ | 308,877 |
Interest cost | 11,603 |  |  | 14,027 |
Actuarial (gain) loss | (21,707 | ) |  | 40,906 |
Benefits paid | (9,604 | ) |  | (9,915 | )
Foreign currency exchange rate changes | (17,273 | ) |  | (21,089 | )
Benefit obligation at end of year | 295,825 |  |  | 332,806 |
Change in pension plan assets |  |  |  |  |
Fair value of plan assets at beginning of year | 282,095 |  |  | 269,811 |
Actual return on plan assets | 569 |  |  | 34,012 |
Employer contributions | 5,631 |  |  | 6,028 |
Benefits paid | (9,604 | ) |  | (9,915 | )
Foreign currency exchange rate changes | (15,136 | ) |  | (17,841 | )
Fair value of plan assets at end of year | 263,555 |  |  | 282,095 |
Funded status at end of year | $ | (32,270 | ) |  | $ | (50,711 | )
Schedule of Net Periodic Benefit Cost Not yet Recognized | Amounts not yet reflected in net periodic pension cost and included in accumulated other comprehensive loss:
| 2015 |  | 2014
Unrecognized losses | $ | 88,818 |  |  | $ | 102,673 |
Schedule of Weighted Average Assumptions Used Calculating Benefit Obligation | The weighted average assumptions used to determine benefit obligations as of December 31, 2015 and 2014 were as follows:
| 2015 |  | 2014
Discount rate | 3.8 | % |  | 3.6 | %
Schedule of Weighted Average Assumptions Used Calculate Net Periodic Pension Cost | The weighted average assumptions used to determine net periodic pension cost for the years ended December 31, 2015, 2014 and 2013 were as follows:
| 2015 |  | 2014 |  | 2013
Discount rate | 3.6 | % |  | 4.6 | % |  | 4.3 | %
Annual rate of return on plan assets | 6.3 | % |  | 6.7 | % |  | 6.7 | %
Components Of Net Periodic Pension Cost | The components of net periodic pension cost of the UK Plan for the years ended December 31, 2015, 2014 and 2013 were as follows (in thousands):
| 2015 |  | 2014 |  | 2013
Interest cost | $ | 11,603 |  |  | $ | 14,027 |  |  | $ | 12,326 |
Expected return on plan assets | (16,181 | ) |  | (16,888 | ) |  | (14,369 | )
Amortization of unrecognized loss | 2,526 |  |  | 2,029 |  |  | 2,560 |
Net periodic pension cost | $ | (2,052 | ) |  | $ | (832 | ) |  | $ | 517 |
Schedule of Weighted Average Asset Allocations and Weighted Average Target Allocations | The weighted average asset allocations and weighted average target allocations at December 31, 2015 and 2014 were as follows:
Asset Category | Target Asset Allocation |  | December 31, 2015 |  | December 31, 2014
Equity securities | 45.0 | % |  | 43.3 | % |  | 43.2 | %
Debt securities | 55.0 | % |  | 56.3 | % |  | 56.6 | %
Cash | — | % |  | 0.4 | % |  | 0.2 | %
Total | 100.0 | % |  | 100.0 | % |  | 100.0 | %
Schedule of Plan Assets Fair Value Hierarchy | The following tables set forth by level, within the fair value hierarchy discussed in Note 10 - Fair Value Measurements, the fair value of assets of the UK Plan as of December 31, 2015 and 2014 (in thousands):
| Assets at Fair Value as of December 31, 2015
Asset Category | Level 1 |  | Level 2 |  | Level 3 |  | Total
Equity and equity like investments | $ | — |  |  | $ | 114,213 |  |  | $ | — |  |  | $ | 114,213 |
Corporate bonds | — |  |  | 114,434 |  |  | — |  |  | 114,434 |
Government bonds | — |  |  | 34,011 |  |  | — |  |  | 34,011 |
Cash | 897 |  |  | — |  |  | — |  |  | 897 |
Total | $ | 897 |  |  | $ | 262,658 |  |  | $ | — |  |  | $ | 263,555 |
| Assets at Fair Value as of December 31, 2014
Asset Category | Level 1 |  | Level 2 |  | Level 3 |  | Total
Equity and equity like investments | $ | — |  |  | $ | 121,739 |  |  | $ | — |  |  | $ | 121,739 |
Corporate bonds | — |  |  | 124,380 |  |  | — |  |  | 124,380 |
Government bonds | — |  |  | 35,319 |  |  | — |  |  | 35,319 |
Cash | 657 |  |  | — |  |  | — |  |  | 657 |
Total | $ | 657 |  |  | $ | 281,438 |  |  | $ | — |  |  | $ | 282,095 |
Schedule of Changes in Fair Value of Plan Assets (Level 3) | The table below sets forth a summary of changes in the fair value of the UK Plan’s Level 3 assets for the years ended December 31, 2015 and 2014 (in thousands):
Equity and Equity Like Investments | 2015 |  | 2014
Start of year balance | $ | — |  |  | $ | 5,196 |
Actual return on plan assets, relating to assets still held at reporting date | — |  |  | — |
Purchases, sales and settlements, net | — |  |  | (4,889 | )
Change due to exchange rate changes | — |  |  | (307 | )
End of year balance | $ | — |  |  | $ | — |
Schedule of Expected Benefit Payments | The following estimated benefit payments are expected to be paid in the following years (in thousands):
| Pension Benefits
2016 | $ | 9,509 |
2017 | $ | 9,869 |
2018 | $ | 10,974 |
2019 | $ | 11,717 |
2020 | $ | 11,842 |
Succeeding five years | $ | 65,494 |
Schedule of Accumulated Benefit Obligations in Excess of Fair Value of Plan Assets | The following table shows certain information for the UK Plan where the accumulated benefit obligation is in excess of plan assets as of December 31, 2015 and 2014 (in thousands):
| 2015 |  | 2014
Projected benefit obligation | $ | 295,825 |  |  | $ | 332,806 |
Accumulated benefit obligation | $ | 295,825 |  |  | $ | 332,806 |
Fair value of plan assets | $ | 263,555 |  |  | $ | 282,095 |
Schedule of Multiemployer Plans | The following table lists all domestic MEPPs to which our contributions exceeded $2.0 million in 2015. Additionally, this table also lists all domestic MEPPs to which we contributed in 2015 in excess of $0.5 million for MEPPs in the critical status, “red zone” and $1.0 million in the endangered status, “orange or yellow zones”, as defined by the PPA (in thousands):
Pension Fund |  | EIN/Pension Plan Number |  | PPA Zone Status (1) |  | FIP/RP Status |  | Contributions |  | Contributions greater than 5% of total plan contributions (2) |  | Expiration date of CBA
| 2015 |  | 2014 |  |  | 2015 |  | 2014 |  | 2013 |
Plumbers & Pipefitters National Pension Fund |  | 52-6152779 001 |  | Yellow |  | Yellow |  | Implemented |  | $ | 12,021 |  |  | $ | 10,425 |  |  | $ | 12,509 |  |  | No |  | January 2016 to August 2019
Sheet Metal Workers National Pension Fund |  | 52-6112463 001 |  | Yellow |  | Yellow |  | Implemented |  | 10,891 |  |  | 9,977 |  |  | 9,476 |  |  | No |  | April 2016 to June 2020
National Electrical Benefit Fund |  | 53-0181657 001 |  | Green |  | Green |  | N/A |  | 8,513 |  |  | 7,985 |  |  | 7,986 |  |  | No |  | February 2016 to September 2020
Pension, Hospitalization & Benefit Plan of the Electrical Industry- Pension Trust Account |  | 13-6123601 001 |  | Green |  | Green |  | N/A |  | 7,543 |  |  | 6,219 |  |  | 6,189 |  |  | No |  | May 2016 to January 2018
Pension Fund |  | EIN/Pension Plan Number |  | PPA Zone Status (1) |  | FIP/RP Status |  | Contributions |  | Contributions greater than 5% of total plan contributions (2) |  | Expiration date of CBA
| 2015 |  | 2014 |  |  | 2015 |  | 2014 |  | 2013 |
National Automatic Sprinkler Industry Pension Fund |  | 52-6054620 001 |  | Red |  | Red |  | Implemented |  | 6,697 |  |  | 6,000 |  |  | 4,226 |  |  | No |  | March 2016 to June 2017
Central Pension Fund of the International Union of Operating Engineers and Participating Employers |  | 36-6052390 001 |  | Green |  | Green |  | N/A |  | 6,465 |  |  | 6,518 |  |  | 6,296 |  |  | No |  | January 2016 to November 2019
Electrical Contractors Association of the City of Chicago Local Union 134, IBEW Joint Pension Trust of Chicago Pension Plan 2 |  | 51-6030753 002 |  | Green |  | Green |  | N/A |  | 5,759 |  |  | 4,051 |  |  | 2,412 |  |  | No |  | May 2016 to June 2016
Plumbers Pipefitters & Mechanical Equipment Service Local Union 392 Pension Plan |  | 31-0655223 001 |  | Red |  | Red |  | Implemented |  | 5,554 |  |  | 4,962 |  |  | 4,128 |  |  | Yes |  | June 2019
Sheet Metal Workers Pension Plan of Northern California |  | 51-6115939 001 |  | Red |  | Red |  | Implemented |  | 4,851 |  |  | 3,467 |  |  | 3,658 |  |  | No |  | June 2016 to June 2018
U.A. Local 393 Pension Trust Fund Defined Benefit |  | 94-6359772 002 |  | Green |  | Green |  | N/A |  | 4,597 |  |  | 3,585 |  |  | 2,811 |  |  | Yes |  | June 2016 to June 2018
Pipefitters Union Local 537 Pension Fund |  | 51-6030859 001 |  | Green |  | Green |  | N/A |  | 3,939 |  |  | 2,981 |  |  | 3,690 |  |  | Yes |  | January 2016 to August 2017
Northern California Pipe Trades Pension Plan |  | 94-3190386 001 |  | Green |  | Green |  | N/A |  | 3,544 |  |  | 3,270 |  |  | 2,258 |  |  | Yes |  | June 2016 to June 2018
Eighth District Electrical Pension Fund |  | 84-6100393 001 |  | Green |  | Green |  | N/A |  | 3,411 |  |  | 2,695 |  |  | 3,005 |  |  | Yes |  | February 2016 to May 2018
Southern California IBEW-NECA Pension Trust Fund |  | 95-6392774 001 |  | Orange |  | Yellow |  | Implemented |  | 2,894 |  |  | 2,776 |  |  | 3,215 |  |  | No |  | May 2016 to November 2019
Southern California Pipe Trades Retirement Fund |  | 51-6108443 001 |  | Green |  | Green |  | N/A |  | 2,743 |  |  | 2,863 |  |  | 5,498 |  |  | No |  | June 2016 to August 2019
Electrical Workers Local No. 26 Pension Trust Fund |  | 52-6117919 001 |  | Green |  | Green |  | N/A |  | 2,620 |  |  | 2,880 |  |  | 2,878 |  |  | Yes |  | June 2016 to July 2018
U.A. Plumbers Local 24 Pension Fund |  | 22-6042823 001 |  | Green |  | Green |  | N/A |  | 2,431 |  |  | 1,998 |  |  | 1,330 |  |  | Yes |  | April 2016
Sheet Metal Workers Pension Plan of Southern California, Arizona & Nevada |  | 95-6052257 001 |  | Red |  | Red |  | Implemented |  | 2,310 |  |  | 1,824 |  |  | 1,271 |  |  | No |  | June 2016 to June 2020
San Diego Electrical Pension Plan |  | 95-6101801 001 |  | Red |  | Green |  | Pending |  | 2,109 |  |  | 1,878 |  |  | 2,162 |  |  | Yes |  | September 2016 to May 2020
U.A. Local 38 Defined Benefit Pension Plan |  | 94-1285319 001 |  | Yellow |  | Yellow |  | Implemented |  | 1,526 |  |  | 1,605 |  |  | 1,522 |  |  | No |  | June 2016 to June 2017
Boilermaker-Blacksmith National Pension Trust |  | 48-6168020 001 |  | Yellow |  | Yellow |  | Implemented |  | 1,367 |  |  | 1,177 |  |  | 1,828 |  |  | No |  | April 2017 to September 2018
Plumbing & Pipe Fitting Local 219 Pension Fund |  | 34-6682376 001 |  | Red |  | Red |  | Implemented |  | 1,262 |  |  | 1,107 |  |  | 1,142 |  |  | Yes |  | May 2017
Building Trades United Pension Trust Fund Milwaukee and Vicinity |  | 51-6049409 001 |  | Yellow |  | Yellow |  | Implemented |  | 1,111 |  |  | 1,033 |  |  | 918 |  |  | No |  | May 2016
Pension Fund |  | EIN/Pension Plan Number |  | PPA Zone Status (1) |  | FIP/RP Status |  | Contributions |  | Contributions greater than 5% of total plan contributions (2) |  | Expiration date of CBA
| 2015 |  | 2014 |  |  | 2015 |  | 2014 |  | 2013 |
Steamfitters Local Union No. 420 Pension Plan |  | 23-2004424 001 |  | Red |  | Red |  | Implemented |  | 845 |  |  | 862 |  |  | 831 |  |  | No |  | April 2017 to May 2017
U.A. Local 467 Defined Benefit Plan |  | 94-2353807 005 |  | Red |  | Red |  | Implemented |  | 844 |  |  | 787 |  |  | 538 |  |  | No |  | June 2016 to June 2018
Plumbers & Pipefitters Local 162 Pension Fund |  | 31-6125999 001 |  | Red |  | Red |  | Implemented (3) |  | 814 |  |  | 818 |  |  | 770 |  |  | Yes |  | May 2019
Other Multiemployer Pension Plans |  |  |  |  |  |  |  |  |  | 40,395 |  |  | 44,248 |  |  | 48,724 |  |  |  |  | Various
Total Contributions |  |  |  |  |  |  |  |  |  | $ | 147,056 |  |  | $ | 137,991 |  |  | $ | 141,271 |  |  |  |  |
_________________
(1) | The zone status represents the most recent available information for the respective MEPP, which may be 2014 or earlier for the 2015 year and 2013 or earlier for the 2014 year.
(2) | This information was obtained from the respective plans’ Form 5500 (“Forms”) for the most current available filing. These dates may not correspond with our fiscal year contributions. The above noted percentages of contributions are based upon disclosures contained in the plans’ Forms. Those Forms, among other things, disclose the names of individual participating employers whose annual contributions account for more than 5% of the aggregate annual amount contributed by all participating employers for a plan year. Accordingly, if the annual contribution of two or more of our subsidiaries each accounted for less than 5% of such contributions, but in the aggregate accounted for in excess of 5% of such contributions, that greater percentage is not available and accordingly is not disclosed.
(3) | For these respective plans, a funding surcharge was currently in effect for 2015.

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