Stock-Based Compensation (Options Outstanding & Exercisable) (Details)	6 Months Ended
	Jun. 30, 2016 USD ($) $ / shares shares
Number of Common Shares Subject to Options (in shares)
Outstanding at January 1 | shares	20,310
Expired | shares	18,310
June 30, 2016 | shares	2,000
Number of common shares subject to options, exercisable (in shares) | shares	2,000
Weighted-Average Exercise Price (in dollars per share)
Outstanding at January 1	$ 28.83
Expired	28.74
June 30, 2016	29.79
Weighted-average exercise price, exercisable (in dollars per share)	$ 29.79
Additional Disclosures
Weighted-average remaining contractual life, outstanding	2 months 1 day
Weighted-average remaining contractual life, exercisable	2 months 1 day
Aggregate intrinsic value, outstanding | $	$ 0
Aggregate intrinsic value, exercisable | $	$ 0
Exercise Price Range Four [Member]
Additional Disclosures
Range of exercise prices, minimum (in dollars per share)	$ 29.79
Common Shares Subject to Options Outstanding & Exercisable (in shares) | shares	2,000
Weighted-Average Remaining Contractual Life	2 months 1 day
Weighted-Average Exercise Price (in dollars per share)	$ 29.79