Quarterly financial data (unaudited) (Tables)

12 Months Ended

Dec. 31, 2014

Quarterly financial data (unaudited) [Abstract]

Quarterly financial information

Quarterly financial information for the years ended December 31, 2013 and 2014 is presented in the following tables:

	Three months ended
(in thousands)	March 31,			June 30,		September 30,		December 31,
Fiscal year 2014
Revenue	$	53,884		$	110,325	$	137,954	$	147,975
Income (loss) from operations		(25,458	)		7,862		31,032		44,620
Net income (loss)		(20,236	)		5,029		21,832		30,116
Net income (loss) per share, basic		(0.55	)		0.13		0.58		0.80
Net income (loss) per share, diluted		(0.55	)		0.13		0.49		0.66
Fiscal year 2013
Revenue	$	43,100		$	82,436	$	89,102	$	98,107
Income (loss) from operations		(13,350	)		14,712		18,147		23,293
Net income (loss)		(8,062	)		10,484		13,491		15,222
Net income (loss) per share, basic		(0.22	)		0.29		0.37		0.42
Net income (loss) per share, diluted		(0.22	)		0.29		0.36		0.41