INCOME TAXES Valuation allowances (Details) - USD ($) $ in Thousands		12 Months Ended
	Sep. 30, 2014	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Sep. 30, 2015
INCOME TAXES
Additional valuation allowances	$ 0	$ 17,415	$ 21,898	$ 44,900
Loan from European operations					$ 5,000
Undistributed earnings of the foreign subsidiaries		2,000			14,300
Deferred tax liability, undistributed foreign earnings		2,624	$ 2,299		$ 2,300
Incremental deferred tax liability		$ 300