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Post Retirement Benefits - Multiemployer Plans (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2011
Multiemployer plan, postretirement benefit
Employee
Dec. 31, 2010
Multiemployer plan, postretirement benefit
Employee
Dec. 31, 2010
Multiemployer plan, postretirement benefit
August 9, 2010 through August 7, 2010
Dec. 31, 2010
Multiemployer plan, postretirement benefit
August 8, 2011 through August 12, 2012
Dec. 31, 2010
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%            
Percentage increase in employee enrollment     6.00%        
Number of employees enrolled     154 164      
Multi-employer plan contributions $ 443 [1] $ 416 [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         1.15 1.20 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, 2011. 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 week, at the following rates: $1.15 per hour from August 9, 2010 through August 7, 2011; $1.20 per hour from August 8, 2011 through August 12, 2012; and, $1.25 per hour from August 13, 2012 through August 10, 2013.