Stockholders' Equity (Details) - $ / shares	Jun. 30, 2015	Mar. 31, 2015
Stockholders' Equity
Dividend declared (in dollars per share)	$ 0.9062	$ 0.84
Series A Cumulative Redeemable Preferred Stock
Stockholders' Equity
Dividend declared (in dollars per share)	0.4531	0.4531
Common Stock
Stockholders' Equity
Dividend declared (in dollars per share)	$ 0.42	$ 0.42