Income Taxes (Details) (TRS, USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
TRS
Deferred income tax (expense) benefit
Federal	$ (3,417)	$ 447
State	(756)	100
Total deferred income tax (expense) benefit	(4,173)	547
Current income tax (expense) benefit
Federal		(2)
State		(1)
Total current income tax (expense) benefit		(3)
Total income tax (expense) benefit	$ (4,173)	$ 544
Reconciliation of Federal statutory rate to the effective tax rate
Effective tax rate (as a percent)	38.60%	38.60%