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Quarterly Financial Data (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended
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, 2015
Dec. 31, 2014
Dec. 31, 2013
Quarterly Financial Data [Abstract]                      
Total revenue $ 25,755 $ 21,193 $ 24,230 $ 24,741 $ 27,101 $ 25,599 $ 21,952 $ 22,322 $ 95,919 $ 96,974 $ 89,248
Operating income 4,643 3,798 919 5,787 6,699 5,840 5,085 4,362 15,147 21,986 22,020
Net income $ 3,277 $ 2,562 $ 614 $ 3,694 $ 4,004 $ 3,883 $ 3,385 $ 2,856 $ 10,147 $ 14,128 $ 14,390
Net income per share - Basic (in dollars per share) $ 0.26 $ 0.20 $ 0.05 $ 0.30 $ 0.32 $ 0.31 $ 0.27 $ 0.23 $ 0.81 $ 1.14 $ 1.17
Net income per share - Diluted (in dollars per share) $ 0.26 $ 0.20 $ 0.05 $ 0.29 $ 0.32 $ 0.30 $ 0.27 $ 0.23 $ 0.79 $ 1.11 $ 1.15