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Estimated net loss and prior service credit (Details 4) (USD $)	12 Months Ended
	Dec. 31, 2013
Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, amortization of net gains (losses)	$ (4,800,000)
Defined benefit plan, amortization of net prior service cost (credit)	71,000
Other Postretirement Benefits
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, amortization of net gains (losses)	(793,000)
Defined benefit plan, amortization of net prior service cost (credit)	$ (1,400,000)

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