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Acquisitions (Narratives) (Details) (USD $)
 3 Months Ended 12 Months Ended 0 Months Ended 3 Months Ended 0 Months Ended 2 Months Ended
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Oct. 02, 2012
AACOA
Dec. 31, 2012
AACOA
Mar. 31, 2013
AACOA
Oct. 24, 2011
Terphane
Dec. 31, 2011
Terphane
Business Acquisition [Line Items]                                
Percentage of outstanding equity interests acquired                       100.00%     100.00%  
Total purchase price                       $ 54,100,000     $ 182,700,000  
Cash received from seller                           600,000    
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 231,096,000 243,194,000 243,530,000 241,526,000 233,038,000 216,648,000 215,859,000 216,644,000 959,346,000 882,188,000 794,420,000   19,900,000     29,200,000
Net income from continuing operations $ 9,402,000 $ 7,428,000 $ 9,590,000 $ 9,517,000 $ 13,850,000 $ 14,210,000 $ 7,388,000 $ 7,737,000 $ 35,937,000 $ 43,185,000 $ 28,545,000   $ 1,000,000     $ 2,000,000