INCOME TAXES (Details) - USD ($) $ in Thousands	3 Months Ended			9 Months Ended		12 Months Ended
	Mar. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Mar. 31, 2018	Mar. 31, 2017
INCOME TAXES [Abstract]
Income from continuing operations before income tax provision		$ 9,455	$ 10,788	$ 29,435	$ 39,524
Income tax provision		$ 5,229	$ 3,929	$ 12,278	$ 14,288
Effective tax rate		55.00%	36.00%	42.00%	36.00%
Undistributed earnings of foreign subsidiaries							$ 0
Income Tax Disclosure [Line Items]
Federal corporate tax rate				35.00%
Income tax provision, One time non-cash charge				$ 2,900
Unrecognized Tax Benefits, Income Tax Penalties and Interest Expense [Abstract]
Unrecognized tax benefits		$ 0		0			$ 0
Penalties and interest expense related to unrecognized tax benefits		$ 0	$ 0	$ 0	$ 0
Forecast [Member]
Income Tax Disclosure [Line Items]
Federal corporate tax rate	21.00%					31.50%
State of California [Member] | Minimum [Member]
Income Tax Examination [Line Items]
Open tax year				2014
State of California [Member] | Maximum [Member]
Income Tax Examination [Line Items]
Open tax year				2015
German Tax Authorities [Member] | Minimum [Member]
Income Tax Examination [Line Items]
Open tax year				2013
German Tax Authorities [Member] | Maximum [Member]
Income Tax Examination [Line Items]
Open tax year				2015