Net Income (Loss) Per Unit (Tables)

6 Months Ended

Jun. 30, 2011

Net Income Loss Per Unit (Tables) [Abstract]

Potentially dilutive common equity excluded from the dilutive net income (loss)

					Six Months
	Three Months Ended				Ended
	June 30,				June 30,
	2011		2010		2011		2010
			(In thousands)
Employee options		820		1,214		820		1,214
Unit appreciation rights		365		345		365		345
Restricted units		59		104		59		104
Phantom units		988		920		988		920
Contingent incentive plan unit awards		39		37		56		49
Series A preferred units		10,996		—		11,121		—