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Post Retirement Benefits - Multiemployer Plans (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2013 Multiemployer plan, postretirement benefit | Aug. 12, 2012 Multiemployer plan, postretirement benefit August 8, 2011 through August 12, 2012 | Aug. 09, 2016 Multiemployer plan, postretirement benefit August 13, 2012 through August 10, 2013 | Aug. 09, 2015 Multiemployer plan, postretirement benefit August 13, 2012 through August 10, 2013 | Aug. 11, 2014 Multiemployer plan, postretirement benefit August 13, 2012 through August 10, 2013 | Aug. 10, 2013 Multiemployer plan, postretirement benefit August 13, 2012 through August 10, 2013
Multiemployer plans: |  |  |  |  |  |  |  |  |  |
Certified zone status, percent funded limit for yellow status | 80.00% |  |  |  |  |  |  |  |  |
Certified zone status, percent funded limit for green status | 80.00% |  |  |  |  |  |  |  |  |
Certified zone status, percent funded limit for red status | 65.00% |  |  |  |  |  |  |  |  |
Multi-employer plan contributions | $ 464 | [1] | $ 443 | [1] |  |  |  |  |  |
Maximum percentage of total contribution |  |  |  |  | 5.00% |  |  |  |  |
Multiemployer plans, collective-bargaining arrangement, maximum hours of work per week for employer contribution |  |  |  |  | 40 hours |  |  |  |  |
Multiemployer plans, collective-bargaining arrangement, rate of employer contribution |  |  |  |  |  | 1.20 | 1.40 | 1.35 | 1.30 | 1.25
[1] | The National Pension Plan utilized a five year amortization extension in accordance with § 431(d) of the Internal Revenue Code of 1986 ("the Code") to amortize its losses from 2008. The plan re-certified its zone status after using the amortization provisions of the Code. The Company's contributions to the plan did not represent more than 5% of total contributions to the plan as indicated in the plan's most recently available annual report for the plan year ended December 31, 2012. Under the terms of the collective-bargaining agreement, the Company is required to make contributions to the plan for each hour worked up to a maximum of 40 hours per person, per week, at the following rates: $1.20 per hour from August 8, 2011 through August 12, 2012; $1.25 per hour from August 13, 2012 through August 10, 2013

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- Definition Multiemployer Plans, Certified Zone Status, Percent Funded Limit for Red Status + References No definition available. + Details
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- Definition Multiemployer Plans, Certified Zone Status, Percent Funded Limit for Yellow Status + References No definition available. + Details
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- Definition Multiemployer Plans, Collective-Bargaining Arrangement, Maximum Hours of Work Per Week for Employer Contribution + References No definition available. + Details
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- Definition Amount of contributions made to multiemployer plans by the employer. 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 11 -URI http://asc.fasb.org/extlink&oid=14450570&loc=SL14450702-114947 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 80 -Section 50 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=14450570&loc=SL14450691-114947 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 80 -Section 50 -Paragraph 5 -Subparagraph (e)(1) -URI http://asc.fasb.org/extlink&oid=14450570&loc=SL14450657-114947 + Details
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