Commitments and Contingencies (Guaranteed Payments) (Details) $ in Thousands	Dec. 31, 2018 USD ($)
Commitments and Contingencies [Abstract]
2019	$ 2,828
2020	1,158
Total guaranteed payments	$ 3,986

Amount of contractual obligation due in the next fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

No definition available.

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