Stockholders' Equity - Narrative (Details) - USD ($) $ / shares in Units, $ in Thousands				3 Months Ended												12 Months Ended
	Feb. 03, 2015	Mar. 05, 2014	Jan. 11, 2013	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, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Class of Stock [Line Items]
Common Stock, Dividends, Per Share, Declared				$ 0.05	$ 0.05				$ 0.04	$ 0.04	$ 0.04	$ 0.03	$ 0.03	$ 0.03	$ 0.03	$ 0.20	$ 0.16	$ 0.12
Dividends, Common Stock, Cash				$ 1,076				$ 836				$ 486	$ 486	$ 486	$ 486	$ 4,302	$ 3,336	$ 1,944
Stock Issued During Period, Shares, New Issues			750,000
Proceeds from Issuance of Common Stock		$ 54,041	$ 3,591													$ 0	$ 54,041	$ 3,591
Preferred stock, authorized shares				1,000,000				1,000,000								1,000,000	1,000,000
Common Stock [Member]
Class of Stock [Line Items]
Common Stock, Dividends, Per Share, Declared						$ 0.05	$ 0.05	$ 0.04
Dividends, Common Stock, Cash					$ 1,076	$ 1,077	$ 1,073		$ 834	$ 834	$ 832
Business Acquisition, Equity Interest Issued or Issuable, Number of Shares	503,857
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