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Acquisitions (Narrative) (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 6 Months Ended 0 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
May 01, 2013
Pipe and Foundation Group
lb
Jun. 30, 2013
Pipe and Foundation Group
Business Acquisition [Line Items]            
Annual production capacity of PVC pipe and fittings         150,000,000  
Cash paid for purchase     $ 178,309 $ 0 $ 178,309  
Net sales 939,047 913,958 1,803,694 1,948,825    
Net income 145,816 115,501 269,163 203,314    
Acquisition-related costs           $ 991