WISCONSIN ECONOMIC DEVELOPMENT TAX CREDIT (Details) - Wisconsin Economic Development Tax Credit Agreement	3 Months Ended
	Mar. 31, 2016 USD ($)	Mar. 31, 2015 USD ($) item
Agreements
Refundable tax credits available, contingent on the Company expending $26.3 million in capital investments and establishing 758 full-time positions		$ 9,000,000
Capital investment expenditures over specified period, requirement to earn the refundable tax credits		$ 26,300,000
Full-time positions that must be created over a specified time period to earn the refundable tax credits | item		758
Period over which the capital investment expenditures must be incurred and the creation of full-time positions must be completed		7 years
Refundable tax credits earned	$ 2,900,000
Refundable tax credit received	200,000
Refundable tax credit receivable	2,700,000
Amortization of tax credits	121,500
Prepaid expenses and other current assets
Agreements
Refundable tax credit receivable	900,000
Other long-term assets
Agreements
Refundable tax credit receivable	1,800,000
Short-term other liabilities
Agreements
Refundable tax credit, offsetting liability	600,000
Other long-term liabilities
Agreements
Refundable tax credit, offsetting liability	$ 1,900,000