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Subsequent events (Details) (USD $)	3 Months Ended		6 Months Ended		2 Months Ended		3 Months Ended	12 Months Ended
Subsequent events (Details) (USD $)	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010	Aug. 31, 2011 3.70% Unsecured Convertible Notes. Repurchase of debt	Jun. 30, 2011 3.70% Unsecured Convertible Notes. Repurchase of debt	Mar. 31, 2011 3.70% Unsecured Convertible Notes.	Dec. 31, 2010 3.70% Unsecured Convertible Notes.	Jun. 30, 2011 3.70% Unsecured Convertible Notes.	Apr. 30, 2009 3.70% Unsecured Convertible Notes.	Jan. 31, 2007 3.70% Unsecured Convertible Notes.
Subsequent events
Unsecured convertible notes repurchased					$ 84,900,000		$ 96,100,000	$ 82,800,000
Approximate aggregate cash price			98,590,000		86,200,000		98,600,000	84,600,000
Stated interest rate (as a percent)	8.00%	8.00%	8.00%	8.00%		3.70%		3.70%	3.70%	3.70%	3.70%
Loss on early extinguishment of debt	1,248,000	41,496,000	3,743,000	41,496,000	2,000,000		2,500,000	2,400,000
Unamortized issuance costs					$ 200,000		$ 400,000	$ 400,000

Amount represents the difference between the fair value of the payments made and the carrying amount of the debt at the time of its extinguishment.

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- Definition

The cash outflow from the repayment of a long-term debt instrument which can be exchanged for a specified amount of another security, typically the entity's common stock, at the option of the issuer or the holder.

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