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10. Preferred Stock Preferred Stock Schedule of Preferred Stock Dividend (Details) - $ / shares
3 Months Ended 12 Months Ended
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
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, 2016
Dec. 31, 2015
Dec. 31, 2014
Series A Preferred Stock [Member]                              
Preferred Stock Dividend [Line Items]                              
Record Date       Apr. 01, 2016 Dec. 30, 2015 Oct. 02, 2015 Jul. 02, 2015 Apr. 02, 2015 Dec. 30, 2014 Oct. 03, 2014 Jul. 03, 2014 Apr. 04, 2014      
Payment Date       Apr. 15, 2016 Jan. 15, 2016 Oct. 15, 2015 Jul. 15, 2015 Apr. 15, 2015 Jan. 15, 2015 Oct. 15, 2014 Jul. 15, 2014 Apr. 15, 2014      
Cash Dividend       $ 0.4921875 $ 0.4921875 $ 0.4921875 $ 0.4921875 $ 0.4921875 $ 0.4921875 $ 0.4921875 $ 0.4921875 $ 0.4921875 $ 0.4921875 $ 1.9687500 $ 1.9687500
Ordinary Taxable Dividend       0.4921875 0.4921875 0.4921875 0.4921875 0.4921875 0.4921875 0.4921875 0.4921875 0.4921875 0.4921875 1.9687500 1.9687500
Nontaxable Return of Capital Distributions       $ 0.00 $ 0.00 $ 0.00 $ 0.00 $ 0.00 $ 0.00 $ 0.00 $ 0.00 $ 0.00 0.00 0.00 0.00
Series B Preferred Stock [Member]                              
Preferred Stock Dividend [Line Items]                              
Record Date     Jul. 01, 2016 Apr. 01, 2016 Dec. 30, 2015 Oct. 02, 2015 Jul. 02, 2015 Apr. 02, 2015 Dec. 30, 2014 Oct. 03, 2014 Jul. 03, 2014 Apr. 04, 2014      
Payment Date     Jul. 15, 2016 Apr. 15, 2016 Jan. 15, 2016 Oct. 15, 2015 Jul. 15, 2015 Apr. 15, 2015 Jan. 15, 2015 Oct. 15, 2014 Jul. 15, 2014 Apr. 15, 2014      
Cash Dividend     $ 0.4765625 $ 0.4765625 $ 0.4765625 $ 0.4765625 $ 0.4765625 $ 0.4765625 $ 0.4765625 $ 0.4765625 $ 0.4765625 $ 0.4765625 0.9531250 1.9062500 1.9062500
Ordinary Taxable Dividend     0.4765625 0.4765625 0.4765625 0.4765625 0.4765625 0.4765625 0.4765625 0.4765625 0.4765625 0.4765625 0.9531250 1.9062500 1.9062500
Nontaxable Return of Capital Distributions     $ 0.00 $ 0.00 $ 0.00 $ 0.00 $ 0.00 $ 0.00 $ 0.00 $ 0.00 $ 0.00 $ 0.00 0.00 $ 0.00 $ 0.00
Series C Preferred Stock [Member]                              
Preferred Stock Dividend [Line Items]                              
Record Date   Nov. 01, 2016 Aug. 01, 2016                        
Payment Date   Nov. 15, 2016 Aug. 15, 2016                        
Cash Dividend $ 0.4140625 $ 0.4094618                     0.8235243    
Ordinary Taxable Dividend 0.4140625 0.4094618                     0.8235243    
Nontaxable Return of Capital Distributions $ 0.00 $ 0.00                     $ 0.00