Segment Reporting (Summary of Capital Expenditures for Reportable Segments) (Details) (USD $) In Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
Total capital expenditures	$ 23,969	$ 41,090	$ 37,517	$ 82,001
Owned and Managed [Member]
Total capital expenditures	20,192	37,271	31,483	76,107
Managed-Only [Member]
Total capital expenditures	1,732	1,373	2,635	2,327
Discontinued Operations [Member]
Total capital expenditures		12		83
Corporate and Other [Member]
Total capital expenditures	$ 2,045	$ 2,434	$ 3,399	$ 3,484