Earnings (Loss) Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands		3 Months Ended		9 Months Ended
	Feb. 28, 2017	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Numerator for calculation of diluted earnings (loss) per share
Net income (loss)		$ 2,577	$ (1,584)	$ (24,478)	$ (2,670)
Denominator for basic income (loss) per share
Weighted-average shares outstanding		75,139	61,365	72,152	61,285
Dilutive effect of stock equivalents		1,751	0
Denominator for diluted earnings (loss) per share		76,890	61,365	72,152	61,285
Basic earnings (loss) per share		$ 0.03	$ (0.03)	$ (0.34)	$ (0.04)
Diluted earnings (loss) per share		$ 0.03	$ (0.03)	$ (0.34)	$ (0.04)
Anti-dilutive securities excluded from diluted earnings (loss) per share calculation
Common stock, New shares issued	13,500
Stock Compensation Plan [Member]
Anti-dilutive securities excluded from diluted earnings (loss) per share calculation
Anti-dilutive stock equivalents		2,461	2,286	2,804	3,944