CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY (Parentheticals) - $ / shares				3 Months Ended								12 Months Ended
	Nov. 08, 2016	Nov. 10, 2015	Dec. 05, 2014	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Cash dividends declared per common share (in dollars per share)				$ 0.41	$ 0.25	$ 0.25	$ 0.25	$ 0.50	$ 0.24	$ 0.24	$ 0.24	$ 1.16	$ 1.22	$ 1.23
Special Cash Dividend [Member]
Cash dividends declared per common share (in dollars per share)	$ 0.15	$ 0.25	$ 0.30