SCHEDULE II-VALUATION AND QUALIFYING ACCOUNTS (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Movement in Valuation Allowances and Reserves [Roll Forward]
Valuation allowances and reserves balance, beginning of year	$ 14,266	$ 5,587	$ 1,960
Deductions	141,493	61,033	29,240
Valuation allowances and reserves balance, end of year	41,911	14,266	5,587
Change in Tax Valuation Allowance
Movement in Valuation Allowances and Reserves [Roll Forward]
Valuation allowances and reserves balance, beginning of year	14,309	10,970	12,062
Charged to Costs and Expenses	0	0	0
Charged other Accounts	941	3,339	0
Deductions	0	0	1,092
Valuation allowances and reserves balance, end of year	15,250	14,309	10,970
Allowance for Doubtful Accounts
Movement in Valuation Allowances and Reserves [Roll Forward]
Valuation allowances and reserves balance, beginning of year	90	16	16
Charged to Costs and Expenses	347	74	0
Charged other Accounts		0	0
Deductions	20	0	0
Valuation allowances and reserves balance, end of year	417	90	16
Reserve for Inventory Obsolescence
Movement in Valuation Allowances and Reserves [Roll Forward]
Valuation allowances and reserves balance, beginning of year	121	212	166
Charged to Costs and Expenses	777	51	228
Charged other Accounts	0	(8)	(12)
Deductions	583	134	170
Valuation allowances and reserves balance, end of year	$ 315	$ 121	$ 212