Basic and Diluted Net Income Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Basic net income per share:
Net income from continuing operations	$ 11,648	$ 11,732
Net loss from discontinued operations	0	(3,348)
Net income	$ 11,648	$ 8,384
Weighted average common shares outstanding, basic (in shares)	36,967	32,736
Basic net income per common share from continuing operations (in dollars per share)	$ 0.32	$ 0.36
Basic net loss per common share from discontinued operations (in dollars per share)	0.00	(0.10)
Net income per share - basic (in dollars per share)	$ 0.32	$ 0.26
Diluted net income per share:
Net income from continuing operations	$ 11,648	$ 11,732
Net loss from discontinued operations	0	(3,348)
Net income	$ 11,648	$ 8,384
Weighted average common shares outstanding, basic (in shares)	36,967	32,736
Effect of dilutive securities:
2016 Convertible notes (in shares)	653	30
Stock options and restricted stock (in shares)	521	576
Weighted average common shares for diluted earnings per share (in shares)	38,141	33,342
Diluted net income per common share from continuing operations (in dollars per share)	$ 0.31	$ 0.35
Diluted net loss per common share from discontinued operations (in dollars per share)	0.00	(0.10)
Net income per share - diluted (in dollars per share)	$ 0.31	$ 0.25