Summary of Significant Accounting Policies - Distributions and Dividends and Reacquired Stock (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Class of Stock [Line Items]
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Distributions payable	$ 14,858	$ 15,140
Common Stock, Dividends, Per Share, Declared	$ 0.24	$ 0.18	$ 0.10
Dividend Declared [Member]
Class of Stock [Line Items]
Common Stock, Dividends, Per Share, Declared	$ 0.24	$ 0.18	$ 0.10