Stockholders' Equity (Details Textuals 2) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended			12 Months Ended
	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Retirement of treasury stock, value				$ 0	$ 0	$ 0
Common stock cash dividend per share	$ 0.0625	$ 0.0625	$ 0.0625	$ 0	$ 0.1875	$ 0.25
Cash dividend payment				$ 486	$ 65,426	$ 87,044
Treasury Stock [Member]
Retirement of treasury stock, value					$ (884,129)
Retirement of treasury stock, shares					60,000,000