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Stockholders' Equity (Details) - USD ($) $ / shares in Units, $ in Thousands		3 Months Ended						9 Months Ended
	Aug. 16, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Sep. 30, 2016	Dec. 31, 2015
Equity offerings
Common stock, shares outstanding (in shares)		107,231,155						107,231,155	100,187,405
Proceeds from the issuance of common stock, net								$ 83,511
Offering related expenses incurred								$ 544
Dividends declared and paid
Dividends Per Share (in dollars per share)		$ 0.19	$ 0.19	$ 0.19	$ 0.19	$ 0.19	$ 0.19
Total Dividends		$ 19,036	$ 19,036	$ 19,036	$ 19,036	$ 19,036	$ 19,036
Public Offering and Over Allotment Option
Equity offerings
Shares of common stock sold	7,043,750
Price per share of common stock sold (in dollars per share)	$ 12.35
Proceeds from the issuance of common stock, net	$ 82,900
Underwriter Overallotment Option
Equity offerings
Shares of common stock sold	918,750

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