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Summary of Significant Accounting Policies (Contract Balances) (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Accounting Policies [Abstract]
Accounts receivable	$ 91,020
Short-term contract liabilities (deferred revenue)	(161)	$ (2,218)
Short-term contract liabilities (accounts payable)	$ (40,935)

The carrying amount of consideration received or receivable as of the balance sheet date on potential earnings that were not recognized as revenue in conformity with GAAP, and which are expected to be recognized as such within one year or the normal operating cycle, if longer, including sales, license fees, and royalties, but excluding interest income.

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