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Share Capital, Preferred Stock (Details) | 1 Months Ended | 12 Months Ended | 25 Months Ended |
--- | --- | --- | --- | ---
Feb. 28, 2018 $ / shares shares | Apr. 30, 2017 USD ($) $ / shares shares | Jun. 30, 2014 USD ($) $ / shares shares | May 31, 2014 USD ($) $ / shares shares | Jun. 30, 2013 USD ($) $ / shares shares | Dec. 31, 2019 USD ($) $ / shares shares | Dec. 31, 2018 USD ($) shares | Dec. 31, 2017 USD ($) | Dec. 31, 2017 shares | Dec. 31, 2015 USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Tender offer preferred stock redemption |  |  |  |  |  | $ 0 | $ 0 | $ 24,890,000 |  |
Preferred deemed dividend |  |  |  |  |  | $ 199,000 | $ 0 | $ 2,146,000 |  |
Series B Preferred Stock |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Redemption price (in USD per share) | $ / shares | $ 25.00 |  |  |  |  |  |  |  |  |
Preferred stock, multiplier to increase dividend rate payable |  |  |  |  | 1.25 |  |  |  |  |
Stock repurchased and retired (in shares) | shares |  |  |  |  |  |  |  |  | 114,232 |
Preferred stock, shares outstanding (in shares) | shares |  |  |  |  |  | 0 | 0 |  |  |
Stock redeemed (in shares) | shares | 379,514 |  |  |  |  |  |  |  |  |
Preferred Stock |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Redemption price (in USD per share) | $ / shares |  |  |  |  |  | $ 25.00 |  |  |  |
Stock repurchase program, authorized amount |  |  |  |  |  |  |  |  |  | $ 20,000,000
Series C Preferred Stock |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Future redeemable securities |  |  |  |  |  | $ 58,305,000 |  |  |  |
Preferred stock, shares outstanding (in shares) | shares |  |  |  |  |  | 2,300,000 | 2,300,000 |  |  |
Series D Preferred Stock |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Future redeemable securities |  |  |  |  |  | $ 81,120,000 |  |  |  |
Preferred stock, shares outstanding (in shares) | shares |  |  |  |  |  | 3,200,000 | 3,200,000 |  |  |
June 2013 Public Offering |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Net proceeds from public offering and private placement |  |  |  |  | $ 38,865,000 |  |  |  |  |
Underwriting discount |  |  |  |  | 672,000 |  |  |  |  |
Offering expenses |  |  |  |  | $ 463,000 |  |  |  |  |
June 2013 Public Offering | Series B Preferred Stock |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Stock issued (in shares) | shares |  |  |  |  | 800,000 |  |  |  |  |
Share price (in USD per share) | $ / shares |  |  |  |  | $ 25.00 |  |  |  |  |
Preferred stock, dividend rate |  |  |  |  | 8.00% |  |  |  |  |
Dividends in arrears (in USD per share) | $ / shares |  |  |  |  | $ 2.00 |  |  |  |  |
Redemption date |  |  |  |  | Jun. 30, 2016 |  |  |  |  |
Redemption price (in USD per share) | $ / shares |  |  |  |  | $ 25.00 |  |  |  |  |
Private Placement | Series B Preferred Stock |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Stock issued (in shares) | shares |  |  |  |  | 800,000 |  |  |  |  |
May 2014 Public Offering |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Net proceeds from public offering and private placement |  |  |  | $ 55,504,000 |  |  |  |  |  |
Underwriting discount |  |  |  | 1,744,000 |  |  |  |  |  |
Offering expenses |  |  |  | $ 252,000 |  |  |  |  |  |
May 2014 Public Offering | Series C Preferred Stock |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Stock issued (in shares) | shares |  |  |  | 2,300,000 |  |  |  |  |  |
Share price (in USD per share) | $ / shares |  |  |  | $ 25.00 |  |  |  |  |  |
Preferred stock, dividend rate |  |  |  | 8.00% |  |  |  |  |  |
Dividends in arrears (in USD per share) | $ / shares |  |  |  | $ 2.00 |  |  |  |  |  |
Redemption price (in USD per share) | $ / shares |  |  |  | $ 25.00 |  |  |  |  |  |
June 2014 Public Offering |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Net proceeds from public offering and private placement |  |  | $ 77,420,000 |  |  |  |  |  |  |
Underwriting discount |  |  | 2,369,000 |  |  |  |  |  |  |
Offering expenses |  |  | $ 211,000 |  |  |  |  |  |  |
June 2014 Public Offering | Series D Preferred Stock |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Stock issued (in shares) | shares |  |  | 3,200,000 |  |  |  |  |  |  |
Share price (in USD per share) | $ / shares |  |  | $ 25.00 |  |  |  |  |  |  |
Preferred stock, dividend rate |  |  | 8.00% |  |  |  |  |  |  |
Dividends in arrears (in USD per share) | $ / shares |  |  | $ 2.00 |  |  |  |  |  |  |
Redemption price (in USD per share) | $ / shares |  |  | $ 25.00 |  |  |  |  |  |  |
April 2017 tender offer |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Tender offer preferred stock redemption |  | $ 24,891,000 |  |  |  |  |  |  |  |
Preferred deemed dividend |  | $ 2,146,000 |  |  |  |  |  |  |  |
April 2017 tender offer | Series B Preferred Stock |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Redemption price (in USD per share) | $ / shares |  | $ 22.50 |  |  |  |  |  |  |  |
Stock repurchased and retired (in shares) | shares |  | 1,106,254 |  |  |  |  |  |  |  |
Percentage of tender acceptance |  | 74.46% |  |  |  |  |  |  |  |
Preferred stock, shares outstanding (in shares) | shares |  | 1,485,768 |  |  |  |  |  |  |  |
April 2017 tender offer | Common Class A |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Stock issued (in shares) | shares |  | 2,212,508 |  |  |  |  |  |  |  |
Maximum | Series B Preferred Stock |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Preferred stock, dividend rate |  |  |  |  | 25.00% | 30.00% |  |  |  |

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