Fair Value Measurements (Details) (Fair value on a recurring basis, USD $) In Thousands	Sep. 30, 2011
Fair Value
Fair value assets and liabilities measured on recurring basis:
Marketable equity securities	$ 12,297
Total fair value assets and liabilities measured on recurring basis	1,766
Fair Value | Interest-rate swap contracts
Fair value assets and liabilities measured on recurring basis:
Derivative liabilities	(11,848)
Fair Value | Warrants
Fair value assets and liabilities measured on recurring basis:
Derivative assets	1,317
Level 1
Fair value assets and liabilities measured on recurring basis:
Marketable equity securities	12,297
Total fair value assets and liabilities measured on recurring basis	12,297
Level 2
Fair value assets and liabilities measured on recurring basis:
Total fair value assets and liabilities measured on recurring basis	(11,848)
Level 2 | Interest-rate swap contracts
Fair value assets and liabilities measured on recurring basis:
Derivative liabilities	(11,848)
Level 3
Fair value assets and liabilities measured on recurring basis:
Total fair value assets and liabilities measured on recurring basis	1,317
Level 3 | Warrants
Fair value assets and liabilities measured on recurring basis:
Derivative assets	$ 1,317