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Derivative Financial Instruments (Details) (USD $)
1 Months Ended
Mar. 31, 2012
Mar. 31, 2013
Dec. 31, 2012
Derivative Designated as Cash Flow Hedges      
Derivative liabilities   $ 0 $ 0
Net deferred losses on derivative instruments expected to be reclassified to operations during the next twelve months   768,000  
Interest rate contract
     
Derivatives      
Component of agreement for Term loan B 470,000,000    
Interest rate basis for term loan borrowings LIBOR    
Derivative Cap (as a percent) 1.00%    
Derivative Designated as Cash Flow Hedges      
Derivative Assets, current   26,000 2,000
Derivative Assets, non-current     30,000
Derivative Assets   $ 26,000 $ 32,000