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Significant Accounting Policies - Statement of Cash Flows (Table) (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Accounting Policies [Abstract]
Cash and cash equivalents	$ 204,921	$ 257,911	$ 181,758
Restricted cash, current (Note 8)	6,435	7,169	5,121
Restricted cash, non-current (Note 8)	2,521	8,420	8,883
Cash and cash equivalents and restricted cash at end of period shown in the statement of cash flows	$ 213,877	$ 273,500	$ 195,762	$ 222,053

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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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