Comprehensive Income and Accumulated Other Comprehensive Loss (Details) (USD $) In Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010	Dec. 31, 2010
Comprehensive Income and Accumulated Other Comprehensive Loss [Abstract]
Net income	$ 8,244	$ 8,773	$ 35,121	$ 60,904
Other comprehensive income/(loss):
Unrealized gain on tax increment financing bond	600	325	129	471
Amortization of settled cash-flow hedges	(30)	(25)	(87)	262
Sale of cash-flow hedge related to disposition of investment in unconsolidated affiliate	0	0	0	103
Total other comprehensive income	570	300	42	836
Total comprehensive income	8,814	9,073	35,163	61,740
Components of AOCL
Tax increment financing bond	2,413		2,413		2,543
Settled cash-flow hedges	1,193		1,193		1,105
Total accumulated other comprehensive loss	$ 3,606		$ 3,606		$ 3,648