Acquisition (Narrative) (Details) - Platinum Health Services, LLC - USD ($) shares in Thousands, $ in Thousands		6 Months Ended
	Jul. 12, 2013	Jun. 30, 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
Business Acquisition [Line Items]
Equity interest issued to acquiree (number of shares)	1,005
Contingent Consideration, Shares Issued
Business Acquisition [Line Items]
Equity interest issued to acquiree (number of shares)		652
Contingent Consideration, Shares Not Issued
Business Acquisition [Line Items]
Equity interest issued to acquiree (number of shares)		353