Acquisition (Narrative) (Details) (USD $) In Thousands, unless otherwise specified	9 Months Ended		0 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Jul. 12, 2013 Platinum Health Services, LLC [Member]	Jul. 12, 2013 Platinum Health Services, LLC [Member] Customer Relationships [Member]
Business Acquisition [Line Items]
Total purchase consideration			$ 46,832
Cash payments to acquire business	5,000	0	5,000
Equity interest issued to acquiree (number of shares)			1,215
Equity interest issued to acquiree (fair value)			30,062
Contingent consideration, fair value			11,770
Acquired finite-lived intangible assets			$ 21,000	$ 21,000
Weighted average useful life of acquired finite-lived intangible assets				10 years