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Other Balance Sheet Items (Other Current Assets) (Details) - USD ($)
$ in Thousands
Mar. 31, 2016
Dec. 31, 2015
Balance Sheet Related Disclosures [Abstract]    
Prepaid expenses $ 15,718 $ 14,823
Income Taxes Receivable, Current 13,948 23,098
Other Assets, Miscellaneous, Current 4,374 1,935
Other Assets, Current $ 34,040 $ 39,856