Net income per share other (Details) - shares	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Anti-dilutive securities excluded from computation of diluted earnings per share
Total anti-dilutive securities (in shares)	4,688,237	10,440,006	6,098,646	12,045,310
Stock options
Anti-dilutive securities excluded from computation of diluted earnings per share
Total anti-dilutive securities (in shares)		3,588,862	581,665	5,096,019
Restricted stock
Anti-dilutive securities excluded from computation of diluted earnings per share
Total anti-dilutive securities (in shares)			23,574	98,147
Convertible preferred stock
Anti-dilutive securities excluded from computation of diluted earnings per share
Total anti-dilutive securities (in shares)	4,688,237	6,851,144	5,493,407	6,851,144