Consolidated statements of comprehensive income (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Revenue:
External customers	$ 13,623	$ 14,288
Affiliates	24,430	27,310
Total revenue	38,053	41,598
Operating costs and expenses and other:
Direct operating costs and expenses	(15,392)	(16,728)
Direct general and administrative expenses	(918)	(1,100)
Allocated general and administrative expenses	(2,782)	(2,740)
Allocated insurance expense	(914)	(958)
Reimbursement of bonus awards	(375)	(313)
Depreciation and amortization	(7,400)	(7,339)
Earnings from unconsolidated affiliates	163	40
Total operating costs and expenses and other	(27,618)	(29,138)
Operating income	10,435	12,460
Other income (expenses):
Interest expense	(953)	(719)
Foreign currency transaction gain		41
Amortization of deferred financing costs	(244)	(244)
Total other expenses, net	(1,197)	(922)
Net earnings	9,238	11,538
Other comprehensive income-foreign currency translation adjustments		174
Comprehensive income	9,238	11,712
Net earnings	9,238	11,538
Less-earnings allocable to general partner interest including incentive distribution rights	(1,756)	(1,362)
Net earnings allocable to limited partners	$ 7,482	$ 10,176
Net earnings per limited partner unit-basic (in dollars per unit)	$ 0.46	$ 0.70
Net earnings per limited partner unit-diluted (in dollars per unit)	$ 0.46	$ 0.70