Summary of Significant Accounting Policies (Details 2) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended													12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	[1]	Dec. 31, 2016	[1]	Sep. 30, 2016	[1]	Jun. 30, 2016	[1]	Mar. 31, 2016	[1]	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Numerator:
Income from continuing operations	$ 14,859	$ 2,965	$ 3,375	$ 1,047		$ 3,349		$ 3,903		$ 3,645		$ 2,013		$ 22,246	$ 12,910	$ 9,146
Less: Income allocated to unvested participating securities														370	231	171
Income from continuing operations available to common stockholders														21,876	12,679	8,975
Income from discontinued operations	$ (30)	$ 30,451	$ 1,159	$ 891		$ 1,588		$ 1,511		$ 1,166		$ 1,011		32,471	5,276	4,268
Less: Income allocated to unvested participating securities														541	94	80
Income from discontinued operations available to common stockholders														31,930	5,182	4,188
Net income available to common stockholders														$ 53,806	$ 17,861	$ 13,163
Denominator:
Denominator for basic earnings per share-weighted average shares	5,815	5,807	5,803	5,795		5,785		5,755		5,754		5,751		5,803	5,761	5,706
Effect of dilutive securities:
Stock options														4	10	34
Denominator for diluted earnings per share - adjusted weighted-average shares and assumed conversions	5,815	5,807	5,806	5,808		5,797		5,764		5,763		5,759		5,807	5,771	5,740
Basic earnings per share:
From continuing operations	$ 2.52	$ 0.50	$ 0.57	$ 0.18		$ 0.57		$ 0.66		$ 0.62		$ 0.35		$ 3.77	$ 2.20	$ 1.58
From discontinued operations	(0.01)	5.16	0.20	0.15		0.27		0.26		0.20		0.17		5.50	0.90	0.73
Basic earnings per share	2.51	5.66	0.77	0.33		0.84		0.92		0.82		0.52		9.27	3.1	2.31
Diluted earnings per share
From continuing operations	2.52	0.50	0.57	0.18		0.57		0.66		0.61		0.35		3.77	2.19	1.56
From discontinued operations	(0.01)	5.16	0.20	0.15		0.27		0.26		0.20		0.17		5.50	0.90	0.73
Diluted earnings per share	$ 2.51	$ 5.66	$ 0.77	$ 0.33		$ 0.84		$ 0.92		$ 0.81		$ 0.52		$ 9.27	$ 3.09	$ 2.29

[1] Certain prior year amounts and March 31, 2017 quarterly data have been reclassified to conform with current presentation.