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Employee Benefit Plans (Tables)
 12 Months Ended
Dec. 31, 2014
Compensation and Retirement Disclosure [Abstract]  
Schedule of Multiemployer Plans [Table Text Block]
 
EIN/Pension Plan Number
Pension Protection Act Zone Status
Contributions to Plan
(in thousands)
Funding Plan
Min Future Contrib
Pension Fund
Status
Plan Year End
Status
Plan Year End
2014
2013
2012
Defined Benefit Plans:
National Electrical Benefit Fund
53-0181657 001
Green
12/31/2013
Green
12/31/2012
$
6,330
$
6,048
$
5,731
No
3% of
wages
Eighth District Electrical Pension Fund
84-6100393 001
Green
3/31/2014
Green
3/31/2013
5,197
5,672
3,733
No
$
1.71/hr
IBEW Local 1249 Pension Plan
15-6035161 001
Yellow
12/31/2013
Yellow
12/31/2012
2,103
3,147
3,679
Yes
$
9.60/hr
Defined Contribution Plans:
National Electrical Annuity Plan
52-6132372 001
n/a
n/a
20,694
21,002
17,081
n/a
n/a
Eighth District Electrical Pension Fund Annuity Plan
84-6100393 002
n/a
n/a
3,553
2,427
2,560
n/a
n/a
All other plans:
6,947
5,591
6,979
Total Contributions:
$
44,824
$
43,887
$
39,763