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Related Party Transactions	12 Months Ended
Related Party Transactions	Dec. 31, 2017
Related Party Transactions [Abstract]
Related Party Transactions	RELATED PARTY TRANSACTIONS Holdings does not maintain a cash account. Consequently, the Company makes payments, as needed, on Holdings’ behalf for corporate expenditures such as taxes and share repurchases for employees that have left the Company and who held equity instruments in Holdings. The Company receives payments on the outstanding balance only when Holdings receives cash from stock issuances. The Company made payments on behalf of Holdings of approximately $14,000, $21,000 and $13,000 during the years ended December 31, 2017, 2016 and 2015, respectively. The balance due from Holdings as of December 31, 2017 and 2016 was $1.2 million. The Company owns 20% of Wandoo Energy LLC (“Wandoo”), a privately owned oil and gas prospecting company. The Company’s Chief Executive Officer and President serves as the Company’s representative on the board of directors of Wandoo. The Company received no cash dividends from Wandoo during the years ended December 31, 2017 and 2015 and received $10,000 in 2016.