SUMMARY OF SIGNIFICANT ACCOUNTING AND BUSINESS POLICIES, Out-of-Period Items (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended												12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Out-of-Period Items [Abstract]
Canadian acquisition deferred tax liability true up	$ (2,180)												$ (2,180)	$ 0	$ 0
Selling, general and administrative expenses													238,091	245,470	303,819
Income tax (benefit)													363	2,523	150
Net income (loss)	$ 6,600	$ 3,000	$ 4,100	$ 3,100	$ 7,100	$ 100	$ 5,100	$ (5,200)	$ (3,200)	$ (52,700)	$ 7,200	$ 9,700	$ 16,529	$ 7,151	$ (39,070)
Basic earnings (loss) per share (in dollars per share)	$ 0.38	$ 0.17	$ 0.24	$ 0.18	$ 0.44	$ 0.02	$ 0.36	$ (0.36)	$ (0.20)	$ (3.64)	$ 0.50	$ 0.67	$ 0.97	$ 0.51	$ (2.68)
Diluted earnings (loss) per share (in dollars per share)	$ 0.37	$ 0.16	$ 0.23	$ 0.17	$ 0.42	$ 0.02	$ 0.34	$ (0.36)					$ 0.93	$ 0.49	$ (2.68)
Overstatement of Accrual at December 31, 2014 [Member]
Out-of-Period Items [Abstract]
Selling, general and administrative expenses												$ 2,500
Out-of-period adjustment, net of tax												$ 1,600
Income tax (benefit)									$ (1,500)
Net income (loss)															$ 3,100
Basic earnings (loss) per share (in dollars per share)															$ (0.21)
Diluted earnings (loss) per share (in dollars per share)															$ (0.21)