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Basis of Presentation (Tables)

3 Months Ended

Mar. 31, 2018

Accounting Policies [Abstract]

Schedule of Cash, Cash Equivalents and Restricted Cash

The following table provides a reconciliation of cash, cash equivalents and restricted cash as reported within the consolidated balance sheet that sum to the total of the same such amounts shown in the statement of cash flows.

		For the three months ended March 31,
(thousands of dollars)		2018				2017
Cash and cash equivalents		$	1,637			$	9,882
Restricted cash - pledged deposits for performance bonds			3,668				3,941
Cash, cash equivalents and restricted cash shown in the statement of cash flows		$	5,305			$	13,823

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