Partners' Equity (Tables)

12 Months Ended

Dec. 31, 2012

Partners' Capital Notes [Abstract]

Schedule of Share-based Compensation, Stock Options, Activity

summary of unit option activity in 2012 and 2011 is presented below:

	2012				2011
			Weighted Average				Weighted Average
	Unit Options		Exercise Price		Unit Options		Exercise Price
Outstanding, beginning of year	224,500		$	24.40	341,500		$	23.10
Granted	280,672		29.53		—		—
Exercised	(206,150	)	24.19		(6,300	)	20.29
Forfeited	(5,000	)	23.81		(110,700	)	20.60
Outstanding, end of year	294,022		$	29.45	224,500		$	24.40
Options exercisable, end of year	83,518		$	29.26	224,500		$	24.40

Schedule of Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding

The following table summarizes information about vested unit options outstanding at December 31, 2012:

Vested Options Outstanding
Type	Range of Exercise Prices					Unit Options		Weighted Average Remaining Contractual Life	Weighted Average Exercise Price
Variable	$	15.07	—	$	15.07	600		0.8 years	$	15.07
Fixed	$	28.45	—	$	29.53	82,918		8.9 years	$	29.36
Outstanding at year-end	$	15.07	—	$	29.53	83,518		8.9 years	$	29.26
Aggregate intrinsic value ($'s in thousands)						$	350

Schedule of Nonvested Share Activity [Table Text Block]

A summary of the status of the Partnership's nonvested unit options at December 31, 2012 is presented below:

	Unit Options		Weighted Average Grant-Date Fair Value
Nonvested, beginning of year	—		$	—
Granted	280,672		29.53
Vested	(70,168	)	29.53
Nonvested, end of year	210,504		$	29.53