Common Shareholders' Equity - Summary of status of options granted under all employee plans (Details 2) (Stock options, USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Stock options
Options Outstanding
Outstanding	21,000	108,500
Granted
Expired	5,000	7,500
Exercised	15,000	80,000
Outstanding	1,000	21,000	108,500
Exercisable, Options	1,000	21,000
Weighted Average Exercise Price
Outstanding	$ 4.70	$ 3.60
Granted
Expired	$ 4.70	$ 4.70
Exercised	$ 4.70	$ 3.21
Outstanding	$ 4.70	$ 4.70	$ 3.60
Exercisable, Weighted Average Exercise Price	$ 4.70	$ 4.70
Weighted Average Remaining Contractual Life, Options Outstanding	2 years	3 years	2 years 11 months 16 days
Aggregate Intrinsic Value, Options Outstanding	$ 3,400	$ 65,100
Exercisable, Weighted Average Remaining Contractual Life	2 years	3 years
Exercisable, Aggregate Intrinsic Value	$ 3,400	$ 65,100