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Summary of Significant Accounting Policies and Other Information - Schedule of Prepaid Expense and Other Current Assets (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Insurance proceeds receivable	$ 10,563				$ 8,500				$ 0	$ 0
Prepaid expenses	3,710				4,072				2,578	4,840
Other	86				1,072				125	0
Total	$ 14,359	$ 14,536	$ 12,453	$ 15,291	$ 13,644	$ 5,146	$ 4,026	$ 4,132	$ 2,703	$ 4,840

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Carrying amount as of the balance sheet date of amounts expected to be recovered under the terms of insurance contracts.

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