Summary of Significant Accounting Policies - Summary of Dividend Declared (Details) - $ / shares	1 Months Ended	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Accounting Policies [Abstract]
Dividends declared per share (in dollars per share)	$ 0.11	$ 0.11	$ 0.10	$ 0.22	$ 0.20