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Cash, Cash Equivalents and Restricted Cash	12 Months Ended
	Dec. 31, 2017
Cash And Cash Equivalents [Abstract]
Cash, Cash Equivalents and Restricted Cash	4. Cash, Cash Equivalents and Restricted Cash Cash and Cash Equivalents Cash is maintained at financial institutions and, at times, balances may exceed federally insured limits of $250 thousand at each financial institution. The Company has not experienced any losses related to these balances. Cash at December 31, 2017 and 2016, was $34,740 and $46,563, respectively. Restricted Cash Restricted cash related to the Company represents cash held as collateral relating to an outstanding short-term bond assuring performance under a fuel agreement with a pipeline common carrier. As of December 31, 2017 and 2016, we had $487 and $971 respectively, of restricted cash.

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- Definition

The entire disclosure for cash and cash equivalent footnotes, which may include the types of deposits and money market instruments, applicable carrying amounts, restricted amounts and compensating balance arrangements. Cash and equivalents include: (1) currency on hand (2) demand deposits with banks or financial institutions (3) other kinds of accounts that have the general characteristics of demand deposits (4) 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. Generally, only investments maturing within three months from the date of acquisition qualify.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 305
-URI http://asc.fasb.org/topic&trid=2122426

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