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Summary of Unaudited Quarterly Financial Information (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
 3 Months Ended 12 Months Ended
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Quarterly Financial Information Disclosure [Abstract]                      
Total revenues $ 14,737 $ 13,005 $ 9,580 $ 11,651 $ 13,635 $ 6,375 $ 5,742 $ 5,636 $ 48,973 $ 31,388 $ 30,037
Total operating costs and expenses 8,310 9,935 8,066 7,719 9,363 7,800 7,557 6,475 34,030 31,195 32,617
Income tax expense (138) (60) (110) (66) 1,636 (142) (338) 35 (374) 1,191 13,270
Income from continuing operations 1,869 1,965 3,694 1,304 2,586 (194) (4,328) (738) 8,832 (2,674) 9,712
Discontinued operations 0 0 2,397 191 (1,523) 0 1,799 1,871 2,588 2,147 3
Net income (loss) $ 1,869 $ 1,965 $ 6,091 $ 1,495 $ 1,063 $ (194) $ (2,529) $ 1,133 $ 11,420 $ (527) $ 9,715
Basic per share amounts:                      
Income (loss) from continuing operations (in usd per share) $ 0.09 $ 0.10 $ 0.18 $ 0.06         $ 0.43 $ (0.14) $ 0.49
Discontinued operations (in usd per share) $ 0.00 $ 0.00 $ 0.12 $ 0.01         $ 0.13 $ 0.11 $ 0.00
Net income (loss) (in usd per share) $ 0.09 $ 0.10 $ 0.30 $ 0.07         $ 0.56 $ (0.03) $ 0.49
Weighted average number of common shares-basic (in shares) 20,442,603,000 20,357,558,000 20,258,618,000 20,189,378,000 20,034,558,000 19,917,676,000 19,749,266,000 19,709,078,000 20,312,395 19,853,095 19,655,632
Diluted per share amounts:                      
Income (loss) from continuing operations (in usd per share) $ 0.09 $ 0.09 $ 0.18 $ 0.06         $ 0.43 $ (0.14) $ 0.49
Discontinued operations (in usd per share) $ 0.00 $ 0.00 $ 0.12 $ 0.01         $ 0.12 $ 0.11 $ 0.00
Net income (loss) income (in usd per share) $ 0.09 $ 0.09 $ 0.30 $ 0.07         $ 0.55 $ (0.03) $ 0.49
Weighted average number of common shares-diluted (in shares) 21,056,156,000 20,843,742,000 20,427,360,000 20,280,030,000 20,124,331,000 19,917,676,000 19,749,266,000 19,738,801,000 20,745,454 19,853,095 19,713,320
Basic and diluted per share amounts:                      
(Loss) income from continuing operations (in usd per share)         $ 0.13 $ (0.01) $ (0.22) $ (0.04)      
Discontinued operations (in usd per share)         $ (0.08) $ 0.00 $ 0.09 $ 0.10      
Net (loss) income (in usd per share)         $ 0.05 $ (0.01) $ (0.13) $ 0.06