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Interest rate swap agreements (Details) (USD $)	12 Months Ended
Interest rate swap agreements (Details) (USD $)	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Derivative Instruments and Hedging Activities Disclosure [Abstract]
The percentage of effectiveness of interest rate swap agreements	100.00%	100.00%	100.00%
Interest rate swap hedge ineffectiveness recognized in earnings	$ 0	$ 0	$ 0
Cash flow hedge loss to be reclassified within twelve month	6,200,000
Collateral obligation requirements	$ 0

The portion of gains and losses (net) on derivative instruments designated and qualifying as hedging instruments representing (a) the amount of the hedge ineffectiveness and (b) the amount, if any, excluded from the assessment of hedge effectiveness.

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