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Quarterly Financial Information (Tables)

12 Months Ended

Dec. 31, 2018

Quarterly Financial Information Disclosure [Abstract]

Summary of Quarterly Financial Information

(in thousands, except per share amounts)

		Quarter Ended
		March 31				June 30				September 30				December 31
Year ended December 31, 2018
Revenues		$	223,975			$	231,603			$	247,287			$	237,832
Cost of revenues			207,713				183,123				187,602				175,588
Gross margin			16,262				48,480				59,685				62,244
Net (loss) income			(9,123	)			11,240				19,087				16,856
Basic (loss) income per common share			(1.25	)			1.54				2.59				2.28
Diluted (loss) income per common share			(1.25	)			1.46				2.50				2.21

Year ended December 31, 2017
Revenues		$	209,997			$	225,574			$	240,135			$	244,726
Cost of revenues			199,547				181,360				185,218				195,776
Gross margin			10,450				44,214				54,917				48,950
Net (loss) income			(11,227	)			11,126				14,785				10,486
Basic (loss) income per common share			(1.55	)			1.53				2.03				1.44
Diluted (loss) income per common share			(1.55	)			1.47				1.96				1.38