Stock Compensation Plans (Schedule of Restricted Stock Units) (Details) - Restricted Stock Units (RSUs) [Member] - $ / shares	12 Months Ended
	Dec. 31, 2016		Dec. 31, 2015	Dec. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Non-vested grants, beginning balance	606,500		1,042,000	164,000
Granted	414,000		2,000	1,195,500
Vested	(271,500)		(410,500)	(310,000)
Forfeited	(16,000)		(27,000)	(7,500)
Non-vested grants, ending balance	733,000	[1]	606,500	1,042,000
Weighted average share price, granted	$ 6.84		$ 11.52	$ 8.29
Weighted average share price, vested	8.72		$ 7.42	$ 10.09
Stock price on grant date	$ 8.32

[1] 497,500 vest in 2017 and 17,000 vest in 2018, and 219,000 vest in 2019