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Fair Value Measurements (Details 1) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2012	Dec. 31, 2011
Fair value and carrying amount
Carrying value	$ 477,648	$ 656,995
2.0% Convertible Senior Notes, due May 15, 2012 [Member]
Fair value and carrying amount
Fair value	0	371,005
Carrying value	0	256,995
7.5% Senior Notes, due November 15, 2019 [Member]
Fair value and carrying amount
Fair value	515,375	414,048
Carrying value	$ 477,648	$ 400,000

Including current and noncurrent portions, aggregate carrying amount of long-term borrowings as of the balance sheet date. 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, and after deducting unamortized discount or premiums, if any.

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