Dividends on Common Stock (Details Textual) - $ / shares	3 Months Ended						9 Months Ended
	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Sep. 30, 2016	Sep. 30, 2015
Common Stock, Dividends, Per Share, Cash Paid	$ 0.22	$ 0.22	$ 0.22	$ 0.20	$ 0.20	$ 0.175
Common Stock, Dividends, Per Share, Declared	$ 0.22	$ 0.22	$ 0.22	$ 0.2	$ 0.20	$ 0.175	$ 0.66	$ 0.575