Long-Term Indebtedness (Details 2) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011	Sep. 30, 2012 Term Loan A	Dec. 31, 2011 Term Loan A	Sep. 30, 2012 Term Loan B	Dec. 31, 2011 Term Loan B	Sep. 30, 2012 HWP Refinance Loan	Dec. 31, 2011 HWP Refinance Loan	Dec. 31, 2010 Senior Credit Facility
Summary of Long-term debt
Long-term debt			$ 72,188	$ 75,000	$ 860,000	$ 860,000	$ 31,232	$ 31,546	$ 950,000
Net discount	(8,418)	(9,310)
Long-term debt	955,002	957,236
Less current portion	(13,418)	(35,296)
Total long-term debt	$ 941,584	$ 921,940