Summary of Significant Accounting Policies - Tax Status of Dividends and Distributions (Details) - $ / shares	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Accounting Policies [Abstract]
Ordinary dividends (dollars per share)	$ 0.5325	$ 0.2693	$ 0.1257
Qualified dividends (dollars per share)	0.0000	0.0000	0.0000
Capital gain distribution (dollars per share)	0.0000	0.0000	0.0009
Non-dividend distributions (dollars per share)	0.3675	0.6307	0.7734
Total (dollars per share)	$ 0.9000	$ 0.9000	$ 0.9000