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CONTINGENCIES (Details)		3 Months Ended			9 Months Ended
	Jun. 22, 2015	Sep. 30, 2017 USD ($) claim	Sep. 30, 2016 USD ($)	Jun. 30, 2016 USD ($)	Sep. 30, 2017 USD ($) claim	Sep. 30, 2016 USD ($)
Commitments and Contingencies Disclosure [Abstract]
Number of legal proceedings (in claims) | claim		0			0
Number of days to file an amendment or stand on current amended complaint	30 days
Regulatory settlement		$ 0	$ 0	$ 1,000,000	$ 0	$ 1,000,000
Pending Litigation | SEPTA Second Amended Complaint
Loss Contingencies [Line Items]
Indemnification costs		$ 508,000			$ 553,000

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Loss Contingency, Claims Dismissed, Period To File An Amendment Or Notice To Stand On The Amended Complaint

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Number of legal proceedings that have material effect.

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Amount of litigation expense, including but not limited to legal, forensic, accounting, and investigative fees.

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The amount of loss pertaining to the specified contingency that was charged against earnings in the period, including the effects of revisions in previously reported estimates.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 450
-SubTopic 20
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=82911808&loc=d3e14326-108349

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