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Long-Term Debt (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Debt
Principal	$ 600,000	$ 600,000
Carrying Value	596,621	596,506
Fair Value	632,250	662,118
2017 notes
Debt
Principal	300,000	300,000
Carrying Value	298,534	298,471
Fair Value	320,250	329,418
Interest rate (as a percent)		8.25%
2019 notes
Debt
Principal	300,000	300,000
Carrying Value	298,087	298,035
Fair Value	$ 312,000	$ 332,700
Interest rate (as a percent)		8.50%

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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