Common Shares and Preferred Shares Stock Subscription (Details) (USD $)	12 Months Ended
	Dec. 31, 2014
Stock subscription offering [Abstract]
Stock subscription offering, subscription price	$ 19.70
Stock subscription offering, number of shares subscribed	637,714
stock subscription offering, value of shares subscribed	$ 12,563,000
Stock subscription offering, minimum financed amount	5,000
Stock subscription offering, down payment	10.00%
Stock subscription offering, term	7 years
Stock subscription offering interest rate	2.00%
Stock subscription offering, minimum amount to receive right	$ 5,000
stock subscription offering, number of shares purchased to receive one right	3
Stock subscription offering, number of rights issued	211,800
Stock subscription offering, portion exercisable per year	14.29%
Stock subscription offering, right expiration term	P7Y