Stockholders' Equity - Common Stock Dividends (Details 2) - $ / shares		3 Months Ended				12 Months Ended
	Feb. 17, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Stockholders' Equity
Common stock dividends declared (in dollars per share)	$ 0.05	$ 0.05	$ 0.05	$ 0.05	$ 0.05	$ 0.20	$ 0	$ 0