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Acquisitions (Narratives) (Details) (USD $)
 3 Months Ended 12 Months Ended 3 Months Ended 12 Months Ended 0 Months Ended
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2011
Sep. 30, 2011
Jun. 30, 2011
Mar. 31, 2011
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2012
AACOA [Member]
Sep. 30, 2012
AACOA [Member]
Sep. 30, 2012
Terphane [Member]
Dec. 31, 2012
Terphane [Member]
Dec. 31, 2011
Terphane [Member]
Oct. 24, 2011
Terphane [Member]
Feb. 03, 2010
Bright View Technologies Corporation [Member]
Feb. 03, 2010
Patented And Unpatented Technology [Member]
Bright View Technologies Corporation [Member]
Business Acquisition [Line Items]                                      
Percentage of outstanding equity interests acquired                         100.00%       100.00%    
Total purchase price                         $ 54,600,000       $ 182,700,000    
Financing used to fund purchase price from existing credit facility                         350,000,000            
Available cash used to fund purchase price                           57,700,000          
Financing used to fund purchase price                           125,000,000          
Sales 233,038,000 216,648,000 215,859,000 216,643,000 201,042,000 201,184,000 200,674,000 191,520,000 882,188,000 794,420,000 738,200,000 19,900,000     143,300,000 29,200,000      
Net income from continuing operations 13,850,000 14,210,000 7,388,000 7,737,000 3,481,000 12,241,000 6,027,000 6,796,000 43,185,000 28,545,000 26,841,000 1,000,000     17,400,000 2,000,000      
Assets purchase price                         $ 54,625,000       $ 182,761,000 $ 5,500,000  
Purchased identifiable intangible assets, amortized over weighted average period                                     12 years