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Property and Equipment - Narrative (Details) (USD $)
3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Property, Plant and Equipment [Abstract]        
Depreciation expense $ 6,900,000 $ 13,400,000 $ 6,900,000 $ 13,400,000
Other Asset Impairment Charges $ 884,000 $ 0 $ 884,000 $ 0