Goodwill and Intangible Assets (Textual) (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	Dec. 31, 2012
Goodwill and Intangible Assets (Textual) [Abstract]
Intangible assets	$ 115,359		$ 115,359		$ 126,931
Impairment charges	4,867	0	4,867	0
Amortization expense	2,911	3,994	6,705	8,006
Customer contracts [Member]
Goodwill and Intangible Assets (Textual) [Abstract]
Weighted-average estimated useful life of amortization intangible assets (years)			15 years
Other intangible assets [Member]
Goodwill and Intangible Assets (Textual) [Abstract]
Weighted-average estimated useful life of amortization intangible assets (years)			6 years
Professional Radiology Services [Member]
Goodwill and Intangible Assets (Textual) [Abstract]
Intangible assets	$ 1,821		$ 1,821