Long-term debt (Narrative) (Details) (USD $)	9 Months Ended
	Sep. 30, 2014 M
Long-term Debt 1	$ 5,000,000
Long-term Debt 2	30
Long-term Debt 3	6.25%
Long-term Debt 4	200,000.0
Long-term Debt 5	2,200,000.0
Long-term Debt 6	400,000.0
Long-term Debt 7	$ 600,000.0