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Equity (Details 1) - USD ($) $ / shares in Units, $ in Thousands | 9 Months Ended |
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017
Class of Stock [Line Items] |  |
Dividend Per Share | $ 0.225 | $ 0.225
Series 2012-A Preferred Stock (''Preferred Stock'') [Member] | January 16, 2018 [Member] |  |
Class of Stock [Line Items] |  |
Declaration Date | Jan. 16, 2018 |
Dividend Per Share | $ 0.1594 |
Aggregate Dividend Amount | $ 370 |
Record Date | Feb. 06, 2018 |
Payment Date | Feb. 15, 2018 |
Series 2012-A Preferred Stock (''Preferred Stock'') [Member] | April 16, 2018 [Member] |  |
Class of Stock [Line Items] |  |
Declaration Date | Apr. 16, 2018 |
Dividend Per Share | $ 0.1594 |
Aggregate Dividend Amount | $ 370 |
Record Date | May 07, 2018 |
Payment Date | May 15, 2018 |
Series 2012-A Preferred Stock (''Preferred Stock'') [Member] | July 25, 2018 [Member] |  |
Class of Stock [Line Items] |  |
Declaration Date | Jul. 25, 2018 |
Dividend Per Share | $ 0.1594 |
Aggregate Dividend Amount | $ 370 |
Record Date | Aug. 08, 2018 |
Payment Date | Aug. 15, 2018 |
Class A Common Stock and Class B Common Stock [Member] | March 7, 2018 [Member] |  |
Class of Stock [Line Items] |  |
Declaration Date | Mar. 07, 2018 |
Dividend Per Share | $ 0.0750 |
Aggregate Dividend Amount | $ 1,865 |
Record Date | Mar. 19, 2018 |
Payment Date | Mar. 23, 2018 |
Class A Common Stock and Class B Common Stock [Member] | May 2, 2018 [Member] |  |
Class of Stock [Line Items] |  |
Declaration Date | May 02, 2018 |
Dividend Per Share | $ 0.0750 |
Aggregate Dividend Amount | $ 1,877 |
Record Date | May 15, 2018 |
Payment Date | May 23, 2018 |
Class A Common Stock and Class B Common Stock [Member] | July 31, 2018 [Member] |  |
Class of Stock [Line Items] |  |
Declaration Date | Jul. 31, 2018 |
Dividend Per Share | $ 0.0750 |
Aggregate Dividend Amount | $ 2,017 |
Record Date | Aug. 15, 2018 |
Payment Date | Aug. 24, 2018 |

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