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Goodwill - Narrative (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2014
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Goodwill [Abstract]        
Goodwill impairment loss $ 420,200 $ 420,201 $ 0 $ 0