Annual report pursuant to Section 13 and 15(d)

Multiemployer Pension Plans (Details Textual)

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Multiemployer Pension Plans (Details Textual)
$ in Thousands
5 Months Ended 7 Months Ended 12 Months Ended
Dec. 31, 2016
USD ($)
Jul. 19, 2016
USD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Multiemployer Plans Contribution And Pension Protection Act Zone Status Description     MEPPs in which the Company participates. Additionally, this table also lists the PPA Zone Status for MEPPS as the critical status (red zone-less than 65% funded), the endangered status (yellow-less than 80% funded) or neither critical or endangered status (green-greater than 80% funded). The zone status represents the most recent available information for the respective MEPP, which is 2016 for the 2017 year. These dates may not correspond with the Companys calendar year contributions.  
Multiemployer Plan, Contributions by Employer $ 16,100 $ 16,700 $ 15,024 $ 13,322
Multiemployer Plans Surcharge Percentage     53.00%  
Multiemployer Plans, Pension [Member]        
Multiemployer Plans Number Of Employer     40  
Multiemployer Plans, Pension [Member] | Pension Protection Act [Member]        
Multiemployer Plans Surcharge Percentage     5.00%  
Multiemployer Plans, Pension [Member] | Retirement Benefit Plan [Member]        
Multiemployer Plans Surcharge Percentage     10.00%