Fair Value Measurements (Details 1) - USD ($) $ in Thousands	3 Months Ended						9 Months Ended		12 Months Ended
	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Sep. 30, 2015	Sep. 30, 2014	Dec. 31, 2014
Contingent consideration
Beginning and ending balances for the Company's fair value measurements using Level 3 inputs
Asset, Beginning Balance	$ 350	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0
Unrealized gains (losses) included in other comprehensive income	0	0	0	0	0	0
New agreements		350			0
Sales Proceeds	0			0
Realized gains (losses) included in earnings	0			0
Asset, Ending Balance	350	350	0	0	0	0	350	0	0
Asset fair value	350	0	0	0	0	0	0	0	0
Convertible Preferred Stock
Beginning and ending balances for the Company's fair value measurements using Level 3 inputs
Asset, Beginning Balance	13,300	13,300	13,300	16,950	20,530	25,720	13,300	25,720	25,720
Unrealized gains (losses) included in other comprehensive income	0	0	0	(1,950)	(3,580)	(5,190)
New agreements		0			0
Sales Proceeds	(992)			0
Realized gains (losses) included in earnings	492			0
Asset, Ending Balance	12,800	13,300	13,300	15,000	16,950	20,530	12,800	15,000	13,300
Asset fair value	13,300	$ 13,300	13,300	16,950	$ 20,530	$ 25,720	13,300	25,720	25,720
Level 3 | Convertible Preferred Stock
Beginning and ending balances for the Company's fair value measurements using Level 3 inputs
Asset, Beginning Balance			13,300				13,300
Asset, Ending Balance	12,800			15,000			12,800	15,000	13,300
Asset fair value	$ 12,800		$ 13,300	$ 15,000			$ 13,300	$ 15,000	$ 13,300
Market Approach Valuation Technique | Level 3 | Convertible Preferred Stock
Beginning and ending balances for the Company's fair value measurements using Level 3 inputs
Fair Value Inputs, Earnings before Interest, Taxes, Depreciation, and Amortization Multiple							5.535	8.35	7.00
Income Approach Valuation Technique | Level 3 | Convertible Preferred Stock
Beginning and ending balances for the Company's fair value measurements using Level 3 inputs
Fair Value Inputs, Discount Rate							14.50%	14.50%	14.50%