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Significant Accounting Policies - Restricted Cash (Details) - USD ($)	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Restricted cash
Cash and cash equivalents	$ 311,732,000	$ 155,933,000
Restricted cash included in other current assets	5,000	15,000
Restricted cash included in other long term assets	500,000	500,000
Total cash, cash equivalents, and restricted cash shown in statement of cash flows	312,237,000	156,448,000	$ 129,758,000	$ 107,389,000
Other current assets
Restricted cash
Restricted cash included in other current assets	$ 5,000	$ 15,000

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Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation.

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Amount of cash and cash equivalents restricted as to withdrawal or usage, classified as current. Cash includes, but is not limited to, currency on hand, demand deposits with banks or financial institutions, and other accounts with general characteristics of demand deposits. Cash equivalents include, but are not limited to, short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.

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