Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Statement of Comprehensive Income [Abstract]
NET INCOME	$ 23,092	$ 85,571	$ 69,436
Other comprehensive income:
Reclassification adjustment for losses included in net income (Pension termination)			2,519
Reclassification adjustment for losses included in net income (Interest expense)	176	168	115
Losses on settlement of swaps arising during the period	(74)		(1,684)
Other comprehensive income	102	168	950
COMPREHENSIVE INCOME	$ 23,194	$ 85,739	$ 70,386