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Consolidated Statements of Stockholders' Equity (Parenthetical) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Increase (Decrease) in Stockholders' Equity [Roll Forward]      
Unrealized gain (loss) on interest rate swaps, tax $ 462 $ 236 $ (440)
Amortization of unrealized loss on interest rate swaps, tax 109 95  
Pension liability adjustment, tax $ 5,060 $ (1,001) $ (3,173)