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Commitments (Narratives) (Details) (USD $)
3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Dec. 31, 2013
Commitments and Contingencies [Abstract]          
Rent Expenses $ 2,400,000 $ 2,600,000 $ 4,900,000 $ 5,200,000  
Line of credit reserve $ 900,000   $ 900,000   $ 900,000