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Quarterly Financial Data - Unaudited (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended								12 Months Ended
	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, 2014	Dec. 31, 2013	Dec. 31, 2012
Quarterly Financial Data [Abstract]
Total revenue	$ 27,101us-gaap_SalesRevenueNet	$ 25,599us-gaap_SalesRevenueNet	$ 21,952us-gaap_SalesRevenueNet	$ 22,322us-gaap_SalesRevenueNet	$ 23,142us-gaap_SalesRevenueNet	$ 21,865us-gaap_SalesRevenueNet	$ 20,258us-gaap_SalesRevenueNet	$ 23,983us-gaap_SalesRevenueNet	$ 96,974us-gaap_SalesRevenueNet	$ 89,248us-gaap_SalesRevenueNet	$ 93,722us-gaap_SalesRevenueNet
Operating income	6,699us-gaap_OperatingIncomeLoss	5,840us-gaap_OperatingIncomeLoss	5,085us-gaap_OperatingIncomeLoss	4,362us-gaap_OperatingIncomeLoss	4,950us-gaap_OperatingIncomeLoss	5,088us-gaap_OperatingIncomeLoss	5,844us-gaap_OperatingIncomeLoss	6,138us-gaap_OperatingIncomeLoss	21,986us-gaap_OperatingIncomeLoss	22,020us-gaap_OperatingIncomeLoss	20,215us-gaap_OperatingIncomeLoss
Net income	$ 4,004us-gaap_NetIncomeLoss	$ 3,883us-gaap_NetIncomeLoss	$ 3,385us-gaap_NetIncomeLoss	$ 2,856us-gaap_NetIncomeLoss	$ 3,158us-gaap_NetIncomeLoss	$ 3,394us-gaap_NetIncomeLoss	$ 3,844us-gaap_NetIncomeLoss	$ 3,994us-gaap_NetIncomeLoss	$ 14,128us-gaap_NetIncomeLoss	$ 14,390us-gaap_NetIncomeLoss	$ 12,685us-gaap_NetIncomeLoss
Net income per share - Basic (in dollars per share)	$ 0.32us-gaap_EarningsPerShareBasic	$ 0.31us-gaap_EarningsPerShareBasic	$ 0.27us-gaap_EarningsPerShareBasic	$ 0.23us-gaap_EarningsPerShareBasic	$ 0.25us-gaap_EarningsPerShareBasic	$ 0.28us-gaap_EarningsPerShareBasic	$ 0.31us-gaap_EarningsPerShareBasic	$ 0.33us-gaap_EarningsPerShareBasic	$ 1.14us-gaap_EarningsPerShareBasic	$ 1.17us-gaap_EarningsPerShareBasic	$ 1.04us-gaap_EarningsPerShareBasic
Net income per share - Diluted (in dollars per share)	$ 0.32us-gaap_EarningsPerShareDiluted	$ 0.30us-gaap_EarningsPerShareDiluted	$ 0.27us-gaap_EarningsPerShareDiluted	$ 0.23us-gaap_EarningsPerShareDiluted	$ 0.25us-gaap_EarningsPerShareDiluted	$ 0.27us-gaap_EarningsPerShareDiluted	$ 0.31us-gaap_EarningsPerShareDiluted	$ 0.32us-gaap_EarningsPerShareDiluted	$ 1.11us-gaap_EarningsPerShareDiluted	$ 1.15us-gaap_EarningsPerShareDiluted	$ 1.03us-gaap_EarningsPerShareDiluted

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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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