Revenue Recognition (Narrative) (Details) - USD ($)	3 Months Ended	12 Months Ended
	Mar. 31, 2016	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2015
Revenue Recognition [line items]
Medicare cap reversal	$ 0
Percentage of automatic budget reductions			2.00%
Unbilled Revenue				$ 1,900,000
Two Program Projected Measurement Period Liability [Member]
Revenue Recognition [line items]
Additional amount owed for Medicare cap		$ 1,900,000	$ 1,900,000