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Other Balance Sheet Items Other Balance Sheet Items (Goodwill) (Details) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Balance Sheet Related Disclosures [Abstract]    
Goodwill, Gross $ 1,537,843 $ 1,537,843
Goodwill, Impaired, Accumulated Impairment Loss (1,485,316) (1,485,316)
Goodwill $ 52,527 $ 52,527