Selected Quarterly Financial Data (Unaudited) (Tables)

12 Months Ended

Dec. 31, 2014

Selected Quarterly Financial Data (Unaudited) [Abstract]

Schedule of Quarterly Financial Information [Table Text Block]

	First Quarter	Second Quarter	Third    Quarter	Fourth   Quarter
2014
Revenues	$       56,086	$      139,688	$        190,280	$      212,464
Gross profit	(3,152)	11,054	18,819	15,622
Net (loss) income	(6,949)	1,615	6,432	4,806
Net (loss) income per common share— basic	$          (0.58)	$            0.13	$              0.53	$           0.40
Net (loss) income per common share— diluted	$          (0.58)	$            0.13	$              0.53	$           0.39
2013
Revenues	$       87,615	$        47,109	$          75,946	$        79,723
Gross profit	4,969	2,277	6,182	(203)
Net loss (1)	(2,644)	(3,438)	(926)	(12,287)
Net loss per common share — basic	$         (0.22)	$          (0.29)	$            (0.08)	$          (1.03)
Net loss per common share — diluted...	$         (0.22)	$          (0.29)	$            (0.08)	$          (1.03)