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Property and Equipment (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Mar. 31, 2012
Property and Equipment [Abstract]      
Depreciation $ 8,377us-gaap_Depreciation $ 8,858us-gaap_Depreciation $ 8,501us-gaap_Depreciation