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Long-Term Debt (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011
Long-term debt disclosures
Unamortized bond premium-senior unsecured notes due 2021	$ 3,194
Total Long-term debt	1,092,719	994,525
Revolving credit facility
Long-term debt disclosures
Long-term debt	330,000	385,000
Senior Notes
Long-term debt disclosures
Long-term debt	762,719	609,525
Unamortized bond premium-senior unsecured notes due 2021	3,194
7.75% senior unsecured notes due 2018
Long-term debt disclosures
Carrying amount of debt	249,525	249,525
7.125% senior unsecured notes due 2021
Long-term debt disclosures
Carrying amount of debt	$ 510,000	$ 360,000

Including current and noncurrent portions, aggregate carrying amount of long-term borrowings as of the balance sheet date before deducting unamortized discount or premiums (if any). May include notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt, which had initial maturities beyond one year or beyond the normal operating cycle, if longer.

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- Definition

Carrying amount of long-term debt, net of unamortized discount or premium, including current and noncurrent amounts. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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