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Employee Retirement Plans (Schedule of Multiemployer Plans) (Details) (Pension) | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
National Integrated Group Pension Plan [Member] |  |  |
Multiemployer Plans [Line Items] |  |  |
EIN | 226190618 |  |
Pension Plan Number | 001 |  |
PPA Zone Status |  | Red | Red
Surcharge Imposed | Yes |  |
Sheet Metal Workers National Pension Plan [Member] |  |  |
Multiemployer Plans [Line Items] |  |  |
EIN | 526112463 |  |
Pension Plan Number | 001 |  |
PPA Zone Status |  | Red | Red
Surcharge Imposed | Yes |  |
Sheet Metal Workers Pension Plan Of Northern California [Member] |  |  |
Multiemployer Plans [Line Items] |  |  |
EIN | 516115939 |  |
Pension Plan Number | 001 |  |
PPA Zone Status |  | Red | Red
Surcharge Imposed | No |  |

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- Definition The Tax Identification Number (TIN), also known as an Employer Identification Number (EIN), is a unique 9-digit value assigned by the IRS. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation 12B -Number 240 -Section 12b -Subsection 1 + Details
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Period Type: | duration

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- Definition Three digit plan number for 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 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=35742057&loc=SL14450657-114947 + Details
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Balance Type: | na
Period Type: | duration

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- Definition Indicate the multiemployer plan's certified zone status as currently required by the Pension Protection Act of 2006 or a subsequent amendment thereof. The zone status categories are red (critical status), orange (seriously endangered), yellow (endangered), and green (none of the above). The acceptable values are "red", "orange", "yellow", "green", "other", and "NA". 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 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=35742057&loc=SL14450657-114947 + Details
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Balance Type: | na
Period Type: | duration

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- Details
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Period Type: | duration

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- Definition Indicate whether the employer paid a surcharge to the 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. The acceptable values are "no", "yes", and "NA". + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 80 -Section 50 -Paragraph 5 -Subparagraph (f)(2) -URI http://asc.fasb.org/extlink&oid=35742057&loc=SL14450657-114947 + Details
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Balance Type: | na
Period Type: | duration