Stock Rights Plan (Narrative) (Details) - Jun. 30, 2015 - $ / shares	Total
Stock Rights Plan [Abstract]
Expiration date of the plan	Dec. 31, 2019
Number of rights distributed as a dividend, per share of common stock	1
Date purchased rights distributed	Apr. 14, 1989
Number of shares that can be purchased by exercising each stock right	0.50
Exercise price (per share)	$ 25
Beneficial ownership percentage that causes rights to be exercisable	15.00%
Percentage sale of assets or earning power to another person where rights become exercisable	50.00%