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Commitments and Contingencies (Details Textual 1) - USD ($)
$ in Millions
 6 Months Ended
Jun. 30, 2015
Dec. 31, 2014
Loss Contingencies [Abstract]    
Letters of Credit Outstanding, Amount $ 19.3 $ 19.3
Letters Of Credit Outstanding Amount Related To Payment Obligation Under Insurance Programs 17.5 17.5
Letters Of Credit Outstanding Amount Related To Contract Performance Obligations 1.8 $ 1.8
Future minimum lease payments for operating leases    
2015 0.8  
2016 1.1  
2017 0.7  
2018 0.5  
2019 0.4  
Thereafter $ 0.2  
Purchase Commitments    
Significant Purchase Commitment Scheduled Period of Time for Cash Outlay 3 months  
Real Estate [Member]    
Purchase Commitments    
Outstanding purchase orders for certain construction equipment $ 3.8  
Equipment [Member]    
Purchase Commitments    
Outstanding purchase orders for certain construction equipment $ 2.9  
Maximum [Member]    
Loss Contingencies [Abstract]    
Operating Lease Term 6 years  
Minimum [Member]    
Loss Contingencies [Abstract]    
Operating Lease Term 1 year