Revenue From Contracts With Customers (Details 2) $ in Thousands	3 Months Ended
Mar. 31, 2018 USD ($)
Revenue From Contracts With Customers [Abstract]
Contract With Customer, Receivable Reclassified to Other Assets	$ 1,438
Contract with Customer, Asset, Net	0
Contract With Customer, Liabilities Reclassified to Other Assets	$ 719

Amount of decrease in right to consideration in exchange for good or service transferred to customer when right is conditioned on something other than passage of time from transfer to receivable due to right to consideration becoming unconditional.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 10
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=82913847&loc=SL49130551-203045

Name:	us-gaap_ContractWithCustomerAssetReclassifiedToReceivable
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration