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Subsequent events (Details) (Long-term incentive plan)				0 Months Ended
Subsequent events (Details) (Long-term incentive plan)	Mar. 31, 2013	Apr. 22, 2008	Apr. 21, 2008	Apr. 24, 2013 Subsequent event
Subsequent events
Maximum number of shares of common stock available for awards	2,175,000	2,175,000	2,000,000	2,875,000
Increase in number of shares of common stock available for awards				700,000

The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested).

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