Long-Term Debt and Other Borrowing Arrangements (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
Carrying values of long-term debt and other borrowing arrangements
Total debt and other borrowing arrangements	$ 550,926	$ 551,155
Less current maturities	0	0
Long-term debt and other borrowing arrangements	550,926	551,155
Senior Subordinated notes due 2017 [Member]
Carrying values of long-term debt and other borrowing arrangements
Total debt and other borrowing arrangements	350,000	350,000
Senior Subordinated notes due 2019 [Member]
Carrying values of long-term debt and other borrowing arrangements
Total debt and other borrowing arrangements	200,926	201,155
Senior Secured Facility [Member]
Carrying values of long-term debt and other borrowing arrangements
Total debt and other borrowing arrangements	$ 0	$ 0