Incentive Compensation Plans (Summary of Stock Option Activity) (Details)	12 Months Ended
	Dec. 31, 2016 $ / shares shares
Non-vested stock options outstanding, Number of shares
Non-vested stock options outstanding, beginning balance | shares	299,200
Stock options granted | shares	140,100
Stock options vested | shares	(99,775)
Stock options forfeited | shares	(12,250)
Non-vested stock options outstanding, ending balance | shares	327,275
Non-vested stock options outstanding, Weighted-average grant-date fair value
Non-vested stock options outstanding, Weighted-average grant-date fair value, beginning balance | $ / shares	$ 10.40
Stock options granted | $ / shares	5.85
Stock options vested | $ / shares	12.11
Stock options forfeited | $ / shares	7.30
Non-vested stock options outstanding, Weighted-average grant-date fair value, ending balance | $ / shares	$ 8.05
Stock options outstanding, Number of shares
Stock options outstanding, beginning balance | shares	841,750
Stock options granted | shares	140,100
Stock options forfeited | shares	(47,250)
Stock options outstanding, ending balance | shares	934,600
Stock options outstanding, Weighted-average exercise price
Stock options outstanding, weighted-average exercise price, beginning balance | $ / shares	$ 25.71
Stock options granted | $ / shares	11.18
Stock options forfeited | $ / shares	24.05
Stock options outstanding, weighted-average exercise price, ending balance | $ / shares	$ 23.62
Stock options outstanding, weighted-average remaining contractual life	5 years 10 months 24 days
Stock options exercisable at end of period | shares	607,325
Stock options exercisable, weighted-average exercise price at end of period | $ / shares	$ 28.24
Stock options exercisable, weighted-average remaining contractual life	4 years 3 months 18 days