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Post Retirement Benefits - Post Retirement Benefits Expense (Details) - USD ($)
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Pension, health and life insurance expense:      
Multi-employer plan contributions [1] $ 863,000 $ 719,000 $ 464,000
Defined contribution plan contributions 836,000 701,000 571,000
Total pension expense 1,699,000 1,420,000 1,035,000
Interest cost 316,000 277,000 332,000
Amortization of prior service costs (496,000) (496,000) (496,000)
Amortization of net loss 169,000 47,000 201,000
Net periodic benefit cost (11,000) (172,000) 37,000
Total post retirement benefits expense 1,688,000 1,248,000 $ 1,072,000
Postretirement benefits      
Postretirement benefits:      
Defined Benefit Plan, Actuarial Gain (Loss) 48,000 (2,726,000)  
Pension, health and life insurance expense:      
Interest cost $ 316,000 $ 277,000  
[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, 2014. 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: $1.25 per hour from August 13, 2012 through August 10, 2013