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Other Balance Sheet Items (Other Current Assets) (Details) - USD ($)
$ in Thousands
Mar. 31, 2017
Dec. 31, 2016
Balance Sheet Related Disclosures [Abstract]    
Prepaid expenses $ 16,076 $ 14,385
Accounts Receivable, Net 8,054 13,051
Income Taxes Receivable, Current 5,262 15,328
Other Assets, Miscellaneous, Current 1,460 1,671
Other Assets, Current $ 30,852 $ 44,435