Quarterly report pursuant to Section 13 or 15(d)

Commitments and Contingencies (Details)

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Commitments and Contingencies (Details) (USD $)
In Thousands, unless otherwise specified
 1 Months Ended
Jun. 30, 2012
Mar. 31, 2012
Jun. 30, 2012
Asbestos Litigation
item
Jun. 30, 2012
Indian Sales Tax and Customs Disputes
Jun. 30, 2011
Notice of Tax Dispute with the Canada Revenue Agency
Jun. 13, 2011
Notice of Tax Dispute with the Canada Revenue Agency
Jul. 27, 2011
Building Construction Accident
item
Commitments and Contingencies              
Totaled arrangements under letter of credit guarantees and performance bonds securing performance obligations $ 10,340            
Guarantee obligations secured by cash deposits 2,218            
Guarantee obligations represented by a reduction of the available amount of the company's short term and long term revolving lines of credit 8,122            
Cash deposits pledged as collateral on performance bonds and letters of credit 2,218 2,398          
Commitments and Contingencies              
Number of personal injury suits     16        
Number of pending cases     2        
Number of pending lawsuits defended by insurers     1        
Number of cost of defense settlements     7        
Estimated settlement consideration       186      
Disallowance of interest deductions           11,640  
Statutory tax rate in Canada (as a percent)           25.00%  
Tax due that is requested by the Agency         $ 2,910    
Number of employees of the erection subcontractor to the general contractor killed             1