Segment Information (Summary of Net (Loss) Income by Segment) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Summary of net income (loss) by segment
Net (loss) income	$ (12,964)	$ (801)	$ (15,382)	$ (5,623)
Imaging [Member]
Summary of net income (loss) by segment
Net (loss) income	18,093	15,280	37,746	31,188
Radiation Oncology [Member]
Summary of net income (loss) by segment
Net (loss) income	2,782	3,771	4,031	5,282
Corporate / Other [Member]
Summary of net income (loss) by segment
Net (loss) income	$ (33,839)	$ (19,852)	$ (57,159)	$ (42,093)