Equity, Distributions Earned (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
General partner's distributions:
General partner's distributions	$ 1,253	$ 597
General partner's IDRs	1,586	0
Total general partner's distributions	2,839	597
Limited partners' distributions:
Common	35,666	14,603
Subordinated	26,162	14,603
Total limited partners' distributions	61,828	29,206
Total Cash Distributions	$ 64,667	$ 29,803