STOCKHOLDERS' EQUITY (Details) (USD $)	0 Months Ended	1 Months Ended	12 Months Ended
	Apr. 24, 2013	Mar. 31, 2010	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Apr. 24, 2013
Stock Offering
Common stock issued in primary public offering (in shares)	10,406,250
Common stock offering price (in dollars per share)	$ 12					$ 12
Common stock issued in secondary offering (in shares)	3,968,750
Net proceeds of public stock offering	$ 118,400,000		$ 0	$ 118,382,000	$ 0
Net proceeds used to repay credit facility	21,000,000		279,703,000	409,559,000	1,307,872,000
Net proceeds used to fund portion of CarePoint acquisition	61,100,000
Treasury Stock
Treasury stock surrendered to satisfy tax withholding obligations (in shares)			54,579		25,999
Treasury stock held (in shares)			2,637,099	2,582,520
Treasury stock acquired (in shares)				0
Treasury stock issued (in shares)			0	0
Common Stock Purchase Warrants
Warrants issued (in shares)		3,400,000
Warrants, exercise term (in years)		5 years
Warrants, exercise price (in dollars per share)		$ 10.00
Percentage below fair value trigger to increase in common stock issued upon exercise of warrants (as a percent)		90.00%
Warrants Exercised			0
Warrants outstanding (in shares)			3,100,000
Warrants
Common Stock Purchase Warrants
Common stock issued pursuant to exercise of warrants (in shares)				78,567
Warrants exercised in cashless exercise (in shares)				256,175
Warrants, fair value		$ 12,300,000
Fair value assumptions, volatility (as a percent)		62.00%
Fair value assumptions, risk free interest rate (as a percent)		2.63%
Fair value assumptions, dividend yield (as a percent)		0.00%
Fair value assumptions, expected term (in years)		5 years
Fair value assumptions, discount for lack of marketability (as a percent)		13.50%