Acquisition (Narrative) (Details) (Platinum Health Services, LLC [Member], USD $) In Thousands, unless otherwise specified	0 Months Ended	3 Months Ended
	Jul. 12, 2013	Mar. 31, 2015
Business Acquisition [Line Items]
Total purchase consideration	$ 50,766
Cash payments to acquire business	5,000
Equity interest issued to acquiree (number of shares)	1,215
Equity interest issued to acquiree	30,062
Contingent consideration fair value	$ 15,704
Contingent Consideration, Total Shares [Member]
Business Acquisition [Line Items]
Equity interest issued to acquiree (number of shares)	1,005
Contingent Consideration, Shares Issued [Member]
Business Acquisition [Line Items]
Equity interest issued to acquiree (number of shares)		652
Contingent Consideration, Shares Not Issued [Member]
Business Acquisition [Line Items]
Equity interest issued to acquiree (number of shares)		353