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Subsequent events (Details) (Subsequent Event [Member], Ralph E. Faison [Member], USD $) In Millions, except Share data, unless otherwise specified	0 Months Ended
	Jul. 14, 2014
Subsequent Event [Line Items]
Severance Costs	$ 2.6
Period for equal installments of severance payment	24 months
Restricted Stock Units [Member]
Subsequent Event [Line Items]
Securities for which full vesting will be paid (in shares)	271,083
Stock Option [Member]
Subsequent Event [Line Items]
Securities for which full vesting will be paid (in shares)	93,645

Amount of expenses for special or contractual termination benefits provided to current employees involuntarily terminated under a benefit arrangement associated exit or disposal activities pursuant to an authorized plan. Excludes expenses related to one-time termination benefits, a discontinued operation or an asset retirement obligation.

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