Significant Accounting Policies (Details) - Variable Interest Entity, Primary Beneficiary [Member] - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Significant Accounting Policies [Line Items]
Consolidated Assets	$ 116,198	$ 190,223
Consolidated Liabilities	$ 89,316	$ 122,460

The carrying amount of the consolidated Variable Interest Entity's liabilities included in the reporting entity's statement of financial position.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 810
-SubTopic 10
-Section 50
-Paragraph 3
-Subparagraph (bb)
-URI http://asc.fasb.org/extlink&oid=108788376&loc=d3e5710-111685

Name:	us-gaap_VariableInterestEntityConsolidatedCarryingAmountLiabilities
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant