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Post Retirement Benefits - Post Retirement Benefits Expense (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Pension, health and life insurance expense:    
Multi-employer plan contributions $ 464 [1] $ 443 [1]
Defined contribution plan contributions 571 527
Total pension expense 1,035 970
Interest cost 332 364
Amortization of prior service costs (496) (496)
Amortization of net loss 201 159
Net periodic benefit cost 37 27
Total post retirement benefits expense 1,072 997
Postretirement benefits
    
Pension, health and life insurance expense:    
Interest cost $ 332 $ 364
[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