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14.Quarterly Financial Data (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended												12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	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, 2017	Dec. 31, 2016	Dec. 31, 2015
Quarterly Financial Information Disclosure [Abstract]
Revenues	$ 107,225	$ 109,488	$ 110,072	$ 107,598	$ 108,183	$ 108,516	$ 104,933	$ 100,649	$ 95,308	$ 93,991	$ 88,361	$ 85,989	$ 434,383	$ 422,282	$ 363,650
Income before income tax expense	8,217	8,109	7,952	7,792	12,651	12,455	12,325	12,229	15,783	15,649	15,200	14,749	32,071	49,661	61,382
Net income (loss)	$ (9,951)	$ 4,663	$ 4,572	$ 4,480	$ 7,465	$ 7,348	$ 7,272	$ 7,214	$ 8,967	$ 8,843	$ 8,537	$ 8,333	$ 3,765	$ 29,300	$ 34,681
Earnings per share - basic	$ (0.46)	$ 0.21	$ 0.20	$ 0.19	$ 0.31	$ 0.31	$ 0.30	$ 0.29	$ 0.35	$ 0.34	$ 0.33	$ 0.33	$ 0.17	$ 1.20	$ 1.34
Earnings per share - diluted	$ (0.46)	$ 0.17	$ 0.17	$ 0.16	$ 0.26	$ 0.26	$ 0.25	$ 0.24	$ 0.29	$ 0.28	$ 0.27	$ 0.26	$ 0.14	$ 1.01	$ 1.10

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- Definition

The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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Amount of income (loss) from continuing operations before deduction of income tax expense (benefit) and income (loss) attributable to noncontrolling interest, and addition of income (loss) from equity method investments.

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Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

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