Related Party Transaction (Details Textual) (USD $) In Thousands, unless otherwise specified	1 Months Ended			6 Months Ended
	Jun. 30, 2012	Mar. 31, 2012	May 31, 2011	Jun. 30, 2012 Pipelines
Related Party Transaction (Additional Textual) [Abstract]
Number of pipelines				2
Received invoice, amount			$ 219
Amount received from RIDOT		152
Remaining receivable from RIDOT	67			67
Increase in amount payable	219
Maximum [Member]
Related Party Transaction (Textual) [Abstract]
Maximum reimbursement				159
Subsidiary of Common Parent [Member]
Related Party Transaction (Textual) [Abstract]
Amount remitted to CTC		$ 152