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Selected Quarterly Financial Data (Details) - USD ($) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Selected Quarterly Financial Data [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues | $ 37,730,000 |  | $ 36,100,000 |  | $ 36,742,000 |  | $ 38,635,000 |  | $ 36,665,000 |  | $ 36,499,000 |  | $ 37,308,000 |  | $ 37,712,000 |  | $ 149,207,000 | $ 148,184,000 | $ 139,598,000
Net income | 6,840,000 |  | 6,126,000 |  | 5,416,000 |  | 3,399,000 |  | 4,280,000 |  | 5,709,000 |  | 16,992,000 |  | 1,710,000 |  | 21,781,000 | 28,691,000 | 14,202,000
Net (loss) income attributable to common shareholders | $ 3,356,000 |  | $ 2,590,000 |  | $ 1,915,000 |  | $ (123,000) |  | $ 747,000 |  | $ 2,183,000 |  | $ 13,458,000 |  | $ (1,815,000) |  | $ 7,738,000 | $ 14,573,000 | $ (1,131,000)
Per common share (basic and diluted) | $ 0.04 | [1] | $ 0.03 | [1] | $ 0.02 | [1] | $ 0.00 | [1] | $ 0.01 | [1] | $ 0.03 | [1] | $ 0.17 | [1] | $ (0.03) | [1] | $ 0.09 | $ 0.18 | $ (0.03)
[1] | Differences between the sum of the four quarterly per share amounts and the annual per share amounts are attributable to the effect of the weighted average outstanding share calculations for the respective periods.

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- Definition The amount of net income or loss for the period per each share in instances when basic and diluted earnings per share are the same amount and reported as a single line item on the face of the financial statements. Basic earnings per share is the amount of net income or loss for the period per each share of common stock or unit outstanding during the reporting period. Diluted earnings per share includes the amount of net income or 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. + References No definition available. + Details
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- Definition 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). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 1 -Article 5 + Details
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