Stockholders' Equity - Narrative (Details) - USD ($) $ / shares in Units, $ in Thousands		3 Months Ended												12 Months Ended
	Mar. 05, 2014	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Class of Stock [Line Items]
Common Stock, Dividends, Per Share, Declared		$ 0.06	$ 0.06	$ 0.06	$ 0.05	$ 0.05	$ 0.05	$ 0.05	$ 0.05	$ 0.04	$ 0.04	$ 0.04	$ 0.04	$ 0.23	$ 0.20	$ 0.16
Dividends, Common Stock, Cash		$ 1,299	$ 1,299	$ 1,300	$ 1,076	$ 1,076	$ 1,076	$ 1,077	$ 1,073	$ 836	$ 834	$ 834	$ 832	$ 4,974	$ 4,302	$ 3,336
Proceeds from Issuance of Common Stock	$ 54,041													$ 0	$ 0	$ 54,041
Preferred stock, authorized shares		1,000,000				1,000,000								1,000,000	1,000,000
Common Stock
Class of Stock [Line Items]
Stock Issued During Period, Shares, New Issues	4,600,000
Blank Check Preferred Stock [Member]
Class of Stock [Line Items]
Preferred stock, authorized shares		875,000												875,000