Equity Method Investments - Summarized unaudited financial data (Details) $ in Thousands	9 Months Ended
	Sep. 30, 2017 USD ($)
Summary financial information of equity method investments
Current assets	$ 9,070
Non-current assets	60,526
Current liabilities	53,627
Non-current liabilities	40,168
Redeemable stock and noncontrolling interests	14,332
Net sales	4,519
Gross profit	4,241
(Loss) from continuing operations	(24,080)
Net (loss)	$ (24,887)