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Debt Obligations, net (Tables) | 12 Months Ended
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Dec. 31, 2021
Debt Disclosure [Abstract] |
Schedule of debt obligations | The Company’s debt obligations were as follows ($ in thousands):(1) ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Carrying Value as of | ​ | Stated | ​ | Scheduled
​ |  | December 31, 2021 |  | December 31, 2020 |  | Interest Rates |  | Maturity Date
Secured credit facilities: |  | ​ |  |  | ​ |  | ​ |  |  |
Revolving Credit Facility | ​ | $ | — | ​ | $ | — | ​ | LIBOR + 2.00 | % (2) | September 2022
Senior Term Loan | ​ |  | 491,875 | ​ |  | 491,875 | ​ | LIBOR + 2.75 | % (3) | June 2023
Total secured credit facilities(4) | ​ |  | 491,875 | ​ |  | 491,875 | ​ |  |  |
Unsecured notes: | ​ |  |  | ​ |  |  | ​ |  |  |
3.125% senior convertible notes(5) | ​ |  | 287,500 | ​ |  | 287,500 | ​ | 3.125 | % | September 2022
4.75% senior notes(6) | ​ |  | 775,000 | ​ |  | 775,000 | ​ | 4.75 | % | October 2024
4.25% senior notes(7) | ​ |  | 550,000 | ​ |  | 550,000 | ​ | 4.25 | % | August 2025
5.50% senior notes(8) | ​ |  | 400,000 | ​ |  | 400,000 | ​ | 5.50 | % | February 2026
Total unsecured notes | ​ |  | 2,012,500 | ​ |  | 2,012,500 | ​ |  |  |
Other debt obligations: | ​ |  |  | ​ |  |  | ​ |  |  |
Trust preferred securities | ​ |  | 100,000 | ​ |  | 100,000 | ​ | LIBOR + 1.50 | % | October 2035
Total debt obligations | ​ |  | 2,604,375 | ​ |  | 2,604,375 | ​ |  |  |
Debt discounts and deferred financing costs, net(9) | ​ |  | (32,201) | ​ |  | (35,095) | ​ |  |  |
Total debt obligations, net(10) | ​ | $ | 2,572,174 | ​ | $ | 2,569,280 | ​ |  |  |
(1) | Certain items have been reclassified to “Liabilities associated with real estate held for sale and classified as discontinued operations” (refer to Note 3).
(2) | The Revolving Credit Facility bears interest at the Company’s election of either: (i) a base rate, which is the greater of (a) prime, (b) federal funds plus 0.50% or (c) LIBOR plus 1.00% and subject to a margin ranging from 1.00% to 1.50%; or (ii) LIBOR subject to a margin ranging from 2.00% to 2.50%. At maturity, the Company may convert outstanding borrowings to a one year term loan which matures in quarterly installments through September 2023.
(3) | The loan bears interest at the Company’s election of either: (i) a base rate, which is the greater of (a) prime, (b) federal funds plus 0.50% or (c) LIBOR plus 1.00% and subject to a margin of 1.75%; or (ii) LIBOR subject to a margin of 2.75%.
(4) | As of December 31, 2021, $0.9 billion net carrying value of assets served as collateral for the Company’s secured debt obligations.
(5) | The Company’s 3.125% senior convertible fixed rate notes due September 2022 ("3.125% Convertible Notes") are convertible at the option of the holders at any time prior to the close of business on the business day immediately preceding September 15, 2022. The conversion rate as of December 31, 2021 was 71.9478 shares per $1,000 principal amount of 3.125% Convertible Notes, which equals a conversion price of $13.90 per
| share. The conversion rate is subject to adjustment from time to time for specified events. Upon conversion, the Company will pay or deliver, as the case may be, a combination of cash and shares of its common stock. As of December 31, 2020, the carrying value of the 3.125% Convertible Notes was $275.1 million, net of fees, and the unamortized discount of the 3.125% Convertible Notes was $10.2 million, net of fees. Upon the adoption of ASU 2020-06 on January 1, 2021, the Company reclassed the unamortized discount to shareholders equity (refer to Note 3). During the years ended December 31, 2021, 2020 and 2019, the Company recognized $9.0 million, $9.0 million, $9.0 million, respectively, of contractual interest and during the years ended December 31, 2020 and 2019 the Company recognized $5.2 million and $5.0 million, respectively, of discount amortization on the 3.125% Convertible Notes. The effective interest rate for 2020 and 2019 was 5.2%.
(6) | The Company can prepay these senior notes without penalty beginning July 1, 2024.
(7) | The Company can prepay these senior notes without penalty beginning May 1, 2025.
(8) | The Company can prepay these senior notes without penalty beginning August 15, 2024.
(9) | On January 1, 2021, the Company adopted ASU 2020-06 and reclassed $10.0 million of debt discount and unamortized fees from the 3.125% Convertible Notes to shareholders’ equity on the Company’s consolidated balance sheet (refer to Note 3).
(10) | The Company capitalized interest relating to development activities of $1.0 million, $1.4 million and $7.4 million for the years ended December 31, 2021, 2020 and 2019, respectively.
Schedule of future scheduled maturities of outstanding debt obligations | As of December 31, 2021, future scheduled maturities of outstanding debt obligations are as follows ($ in thousands): ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | Unsecured Debt |  | Secured Debt |  | Total
2022 | ​ | $ | 287,500 | ​ | $ | — | ​ | $ | 287,500
2023 | ​ |  | — | ​ |  | 491,875 | ​ |  | 491,875
2024 | ​ |  | 775,000 | ​ |  | — | ​ |  | 775,000
2025 | ​ |  | 550,000 | ​ |  | — | ​ |  | 550,000
2026 | ​ |  | 400,000 | ​ |  | — | ​ |  | 400,000
Thereafter | ​ |  | 100,000 | ​ |  | — | ​ |  | 100,000
Total principal maturities | ​ |  | 2,112,500 | ​ |  | 491,875 | ​ |  | 2,604,375
Unamortized discounts and deferred financing costs, net | ​ |  | (30,604) | ​ |  | (1,597) | ​ |  | (32,201)
Total debt obligations, net | ​ | $ | 2,081,896 | ​ | $ | 490,278 | ​ | $ | 2,572,174

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