Commitments and Contingencies (Details) - Officer [Member] $ in Thousands	12 Months Ended
Dec. 31, 2018 USD ($) retirement_agreement
Loss Contingencies [Line Items]
Number of retirement agreements \| retirement_agreement	2
Maximum retirement agreement amount	$ 795
Retirement obligation earned	$ 89

Minimum amount of other commitment not otherwise specified in the taxonomy. Excludes commitments explicitly modeled in the taxonomy, including but not limited to, long-term and short-term purchase commitments, recorded and unrecorded purchase obligations, supply commitments, registration payment arrangements, leases, debt, product warranties, guarantees, environmental remediation obligations, and pensions.

No definition available.

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