Fair Value Measurements (Details 1) - USD ($) $ in Thousands	3 Months Ended				6 Months Ended		12 Months Ended
	Jun. 30, 2015	Mar. 31, 2015	Mar. 31, 2014	Jun. 30, 2013	Jun. 30, 2015	Jun. 30, 2014	Dec. 31, 2014
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	$ 25,720		$ 13,300	$ 25,720	$ 25,720
Unrealized gains (losses) included in other comprehensive income	0	0	(5,190)	$ (3,580)
Asset, Ending Balance	13,300	13,300	20,530		13,300	16,950	13,300
Asset fair value	13,300	13,300	$ 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	13,300				13,300	16,950	13,300
Asset fair value	$ 13,300	$ 13,300			$ 13,300	$ 16,950	$ 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					6.15	7.75	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%