Net income per share other (Details) - shares	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Anti-dilutive securities excluded from computation of diluted earnings per share
Total anti-dilutive securities (in shares)	8,784,615	12,985,556
Stock options
Anti-dilutive securities excluded from computation of diluted earnings per share
Total anti-dilutive securities (in shares)	1,933,471	5,908,970
Restricted stock
Anti-dilutive securities excluded from computation of diluted earnings per share
Total anti-dilutive securities (in shares)		225,442
Convertible preferred stock
Anti-dilutive securities excluded from computation of diluted earnings per share
Total anti-dilutive securities (in shares)	6,851,144	6,851,144