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Business Combinations - Acquisition of Cloverleaf (Details) - USD ($)
$ in Thousands
May 01, 2019
Jun. 30, 2019
Dec. 31, 2018
Assets      
Goodwill   $ 300,007 $ 186,095
Cloverleaf      
Business Acquisition [Line Items]      
Fair value of assets and liabilities acquired $ 1,250,000    
Assets      
Land 59,363    
Building and improvements 687,821    
Machinery and equipment 144,825    
Assets under construction 20,968    
Operating lease right-of-use assets 1,254    
Cash and cash equivalents 4,332    
Accounts receivable 21,358    
Goodwill 107,643    
Acquired identifiable intangibles:      
Other assets 18,720    
Total assets 1,309,645    
Liabilities      
Accounts payable and accrued expenses 30,905    
Notes payable 17,179    
Operating lease obligations 1,254    
Unearned revenue 3,536    
Pension and postretirement benefits 2,020    
Deferred tax liability 9,063    
Total liabilities 63,957    
Total consideration 1,245,688    
Customer relationships | Cloverleaf      
Acquired identifiable intangibles:      
Identifiable intangibles $ 241,738    
Liabilities      
Weighted average remaining intangible amortization life (in months) 25 years    
Trade names and trademarks | Cloverleaf      
Acquired identifiable intangibles:      
Identifiable intangibles $ 1,623    
Liabilities      
Weighted average remaining intangible amortization life (in months) 1 year 6 months