LONG-TERM DEBT AND FINANCING ARRANGEMENTS (Details 2) (Secured notes payable and capital leases, USD $) In Thousands, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013	Dec. 31, 2012
Financing Arrangements
Total assets securitizing notes payable or held under capital leases	$ 87,175	$ 62,165	$ 96,600
Less accumulated depreciation and amortization	28,000	26,847
Net assets securitizing notes payable or held under capital leases	59,175	35,318	61,400
Revenue equipment
Financing Arrangements
Total assets securitizing notes payable or held under capital leases	83,622	58,613
Land and structures (terminals)
Financing Arrangements
Total assets securitizing notes payable or held under capital leases	1,794	1,794
Service, office, and other equipment
Financing Arrangements
Total assets securitizing notes payable or held under capital leases	$ 1,759	$ 1,758