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ACCOUNTING POLICIES (Adopted Accounting Pronouncements) (Details) - USD ($) $ / shares in Units, $ in Thousands		3 Months Ended								12 Months Ended
	Jan. 01, 2018	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Adopted Accounting Pronouncements
Retained earnings		$ 501,389				$ 438,379				$ 501,389	$ 438,379
Revenues		774,279	$ 826,158	$ 793,350	$ 700,001	710,721	$ 744,280	$ 720,368	$ 651,088	3,093,788	2,826,457	$ 2,700,219
Operating expenses		737,117	770,103	790,194	687,276	691,982	717,538	694,601	660,988	2,984,690	2,765,109	2,666,154
Increase in other cost										19,158	4,723	2,151
Net income		15,299	$ 40,776	$ 1,233	$ 9,954	36,568	$ 14,788	$ 15,777	$ (7,407)	67,262	59,726	18,652
Additional paid-in capital		325,712				319,436				325,712	319,436
Noncurrent deferred tax liabilities		$ 56,441				$ 49,157				56,441	49,157
Retained Earnings
Adopted Accounting Pronouncements
Net income										67,262	59,726	18,652
ASC Topic 715, Compensation – Retirement Benefits | Adjustment
Adopted Accounting Pronouncements
Operating expenses											(7,800)	(5,100)
Increase in other cost											$ 7,800	$ 5,100
Net income										$ 0
EPS (in dollars per share)										$ 0.00
ASC Topic 220, Reclassification of Certain Tax Effects from Accumulated Other Comprehensive Income | Accumulated Other Comprehensive Loss
Adopted Accounting Pronouncements
Reclassification from AOCI to Retained earnings tax effect	$ (3,600)
ASC Topic 220, Reclassification of Certain Tax Effects from Accumulated Other Comprehensive Income | Retained Earnings
Adopted Accounting Pronouncements
Reclassification from AOCI to Retained earnings tax effect	3,600
Difference between Revenue Guidance in Effect before and after Topic 606 | ASC Topic 606, Revenue from Contracts with Customers
Adopted Accounting Pronouncements
Retained earnings	$ 400
Revenues										$ 700
Purchased transportation										$ 700

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