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Quarterly Financial Data (Unaudited) (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, 2017	Dec. 31, 2016	Dec. 31, 2015
Selected Quarterly Financial Information [Line Items]
Revenue	$ 33,375	$ 30,387	$ 28,080	$ 26,560	$ 25,299	$ 24,161	$ 21,844	$ 20,224	$ 116,555	$ 91,527	$ 69,966
Net Income	$ 16,672	$ 12,283	$ 15,067	$ 14,768	$ 12,906	$ 14,476	$ 10,828	$ 7,586	$ 58,790	$ 45,797	$ 39,762
Earnings per Share - diluted	$ 0.55	$ 0.42	$ 0.56	$ 0.55	$ 0.50	$ 0.61	$ 0.48	$ 0.36	$ 2.08	$ 1.97	$ 2.16

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The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

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The consolidated profit or loss for the period, net of income taxes, including the portion attributable to the noncontrolling interest.

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