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Other Balance Sheet Items (Other Current Assets) (Details) - USD ($)
$ in Thousands
Jun. 30, 2017
Dec. 31, 2016
Balance Sheet Related Disclosures [Abstract]    
Prepaid expenses $ 20,745 $ 14,385
Accounts Receivable, Net 9,496 13,051
Income Taxes Receivable, Current 3,958 15,328
Other Assets, Miscellaneous, Current 1,448 1,671
Other Assets, Current $ 35,647 $ 44,435