Unit Based Awards Unit Based Awards (Tables)

6 Months Ended

Jun. 30, 2013

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

Schedule of compensation costs related to unit based plan

Amounts recognized in selling, general, and administrative expense in the consolidated and condensed financial statements with respect to these plans are as follows:

	Three Months Ended June 30,				Six Months Ended June 30,
	2013		2012		2013		2012
Employees	$	155	$	143	$	351	$	167
Non-employee directors	68		118		128		150
Total unit-based compensation expense	$	223	$	261	$	479	$	317

Summary of restricted unit activity

A summary of the restricted unit activity for the six months ended June 30, 2013 is provided below:

	Number of Units			Weighted Average Grant-Date Fair Value Per Unit
Non-vested, beginning of period	13,248			$	39.85
Granted	63,750			$	32.29
Vested	(4,500		)	$	39.46
Forfeited	(250		)	31.06
Non-Vested, end of period	72,248			$	33.23
Aggregate intrinsic value, end of period	$	3,185

Summary of aggregate intrinsic value and fair value of units vested

A summary of the restricted units’ aggregate intrinsic value (market value at vesting date) and fair value of units vested (market value at date of grant) during the three and six months ended June 30, 2013 and 2012 are provided below:

	Three Months Ended June 30,				Six Months Ended June 30,
	2013		2012		2013		2012
Aggregate intrinsic value of units vested	$	—	$	11	$	153	$	214
Fair value of units vested	$	—	$	—	$	157	$	214