Description of the Business and Summary of Significant Accounting Policies (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Cash Paid for Interest
Debt interest paid	$ 61,667	$ 65,231	$ 71,561
Capitalized interest	(620)	(1,188)	(793)
Cash paid for interest, net of capitalized interest	$ 61,047	$ 64,043	$ 70,768