Supplementary Balance Sheet Information - Prepaid Expenses and Other Current Assets (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Supplementary Balance Sheet Information
Prepaid expenses	$ 63,088	$ 48,058
Income taxes receivable	26,782	19,362
R and D state tax credit	21,593	26,541
Supplies inventory	20,074	18,089
Other	68,692	76,305
Total	$ 200,229	$ 188,355

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Carrying amount due within one year of the balance sheet date (or one operating cycle, if longer) from tax authorities as of the balance sheet date representing refunds of overpayments or recoveries based on agreed-upon resolutions of disputes.

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Amount of current assets classified as other.

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Amount of asset related to consideration paid in advance for costs that provide economic benefits in future periods, and amount of other assets that are expected to be realized or consumed within one year or the normal operating cycle, if longer.

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