Recent Accounting Pronouncements (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018	Mar. 31, 2018	Dec. 31, 2017
Accounting Changes and Error Corrections [Abstract]
Cash and cash equivalents	$ 21,946	$ 50,311	$ 15,153	$ 10,127
Restricted cash	12,229	11,951	12,271	13,382
Cash, cash equivalents and restricted cash	$ 34,175	$ 62,262	$ 27,424	$ 23,509

Amount of cash and cash equivalents restricted as to withdrawal or usage. 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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Name:	us-gaap_RestrictedCashAndCashEquivalents
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant