(Summary of Identifiable Assets) (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Summary of Company's identifiable assets by segment
Identifiable assets	$ 528,178	$ 560,141
Imaging [Member]
Summary of Company's identifiable assets by segment
Identifiable assets	269,426	282,906
Radiation Oncology [Member]
Summary of Company's identifiable assets by segment
Identifiable assets	182,900	176,353
Corporate / Other [Member]
Summary of Company's identifiable assets by segment
Identifiable assets	$ 75,852	$ 100,882