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Debt Obligations, net - Schedule of Debt (Details) - USD ($) | 1 Months Ended | 3 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Jun. 30, 2018 | Sep. 30, 2017 | Mar. 31, 2019 | Mar. 31, 2018 | Dec. 31, 2018 | Oct. 31, 2017 | Aug. 31, 2016 | Jun. 30, 2016
Debt Obligations |  |  |  |  |  |  |  |
Total debt obligations |  |  | $ 3,117,320,000 |  | $ 3,661,617,000 |  |  |
Debt discounts and deferred financing costs, net |  |  | (47,024,000) |  | (52,531,000) |  |  |
Debt obligations, net |  |  | 3,070,296,000 |  | 3,609,086,000 |  |  |
Interest costs capitalized |  |  | $ 3,000,000 | $ 2,400,000 |  |  |  |
2016 Senior Term Loan | LIBOR |  |  |  |  |  |  |  |
Debt Obligations |  |  |  |  |  |  |  |
Basis point spread on variable interest rate (as a percent) |  |  | 1.00% |  |  |  |  |
3.125% senior convertible notes |  |  |  |  |  |  |  |
Debt Obligations |  |  |  |  |  |  |  |
Stated interest rates (as a percent) |  |  | 3.125% |  |  |  |  |
Secured credit facilities and mortgages |  |  |  |  |  |  |  |
Debt Obligations |  |  |  |  |  |  |  |
Total debt obligations |  |  | $ 1,279,820,000 |  | 1,449,117,000 |  |  |
Debt discounts and deferred financing costs, net |  |  | (9,206,000) |  |  |  |  |
Debt obligations, net |  |  | 1,270,614,000 |  |  |  |  |
Secured credit facilities and mortgages | 2015 $325 million Revolving Credit Facility |  |  |  |  |  |  |  |
Debt Obligations |  |  |  |  |  |  |  |
Total debt obligations |  |  | $ 0 |  | 0 |  |  |
Debt instrument term (in years) |  |  | 1 year |  |  |  |  |
Debt instrument, face amount |  |  | $ 325,000,000 |  |  |  |  |
Secured credit facilities and mortgages | 2015 $325 million Revolving Credit Facility | LIBOR |  |  |  |  |  |  |  |
Debt Obligations |  |  |  |  |  |  |  |
Basis point spread on variable interest rate (as a percent) |  |  | 2.50% |  |  |  |  |
Secured credit facilities and mortgages | 2015 $325 million Revolving Credit Facility | LIBOR | Minimum |  |  |  |  |  |  |  |
Debt Obligations |  |  |  |  |  |  |  |
Basis point spread on variable interest rate (as a percent) |  |  | 1.00% |  |  |  |  |
Secured credit facilities and mortgages | 2015 $325 million Revolving Credit Facility | LIBOR | Minimum | Interest Rate Category Two |  |  |  |  |  |  |  |
Debt Obligations |  |  |  |  |  |  |  |
Basis point spread on variable interest rate (as a percent) |  |  | 2.25% |  |  |  |  |
Secured credit facilities and mortgages | 2015 $325 million Revolving Credit Facility | LIBOR | Maximum | Interest Rate Category Two |  |  |  |  |  |  |  |
Debt Obligations |  |  |  |  |  |  |  |
Basis point spread on variable interest rate (as a percent) |  |  | 2.75% |  |  |  |  |
Secured credit facilities and mortgages | 2015 $325 million Revolving Credit Facility | Base Rate | Minimum | Interest Rate Category One |  |  |  |  |  |  |  |
Debt Obligations |  |  |  |  |  |  |  |
Basis point spread on variable interest rate (as a percent) |  |  | 1.25% |  |  |  |  |
Secured credit facilities and mortgages | 2015 $325 million Revolving Credit Facility | Base Rate | Maximum | Interest Rate Category One |  |  |  |  |  |  |  |
Debt Obligations |  |  |  |  |  |  |  |
Basis point spread on variable interest rate (as a percent) |  |  | 1.75% |  |  |  |  |
Secured credit facilities and mortgages | 2015 $325 million Revolving Credit Facility | Federal Funds Rate |  |  |  |  |  |  |  |
Debt Obligations |  |  |  |  |  |  |  |
Basis point spread on variable interest rate (as a percent) |  |  | 0.50% |  |  |  |  |
Secured credit facilities and mortgages | 2016 Senior Term Loan |  |  |  |  |  |  |  |
Debt Obligations |  |  |  |  |  |  |  |
Total debt obligations |  |  | $ 645,125,000 |  | 646,750,000 |  |  |
Debt instrument, face amount | $ 650,000,000.0 | $ 400,000,000.0 |  |  |  |  | $ 500,000,000.0 | $ 450,000,000.0
Secured credit facilities and mortgages | 2016 Senior Term Loan | LIBOR |  |  |  |  |  |  |  |
Debt Obligations |  |  |  |  |  |  |  |
Basis point spread on variable interest rate (as a percent) | 2.75% | 3.00% | 2.75% |  |  |  |  |
Secured credit facilities and mortgages | 2016 Senior Term Loan | LIBOR | Minimum |  |  |  |  |  |  |  |
Debt Obligations |  |  |  |  |  |  |  |
Basis point spread on variable interest rate (as a percent) |  | 0.75% |  |  |  |  |  |
Secured credit facilities and mortgages | 2016 Senior Term Loan | LIBOR | Maximum |  |  |  |  |  |  |  |
Debt Obligations |  |  |  |  |  |  |  |
Basis point spread on variable interest rate (as a percent) |  |  | 1.75% |  |  |  |  |
Secured credit facilities and mortgages | 2016 Senior Term Loan | Federal Funds Rate |  |  |  |  |  |  |  |
Debt Obligations |  |  |  |  |  |  |  |
Basis point spread on variable interest rate (as a percent) |  |  | 0.50% |  |  |  |  |
Secured credit facilities and mortgages | Mortgages collateralized by net lease assets |  |  |  |  |  |  |  |
Debt Obligations |  |  |  |  |  |  |  |
Total debt obligations |  |  | $ 634,695,000 |  | 802,367,000 |  |  |
Weighted average interest rate (percent) |  |  | 4.40% |  |  |  |  |
Secured credit facilities and mortgages | Mortgages collateralized by net lease assets | Minimum |  |  |  |  |  |  |  |
Debt Obligations |  |  |  |  |  |  |  |
Stated interest rates (as a percent) |  |  | 3.62% |  |  |  |  |
Secured credit facilities and mortgages | Mortgages collateralized by net lease assets | Maximum |  |  |  |  |  |  |  |
Debt Obligations |  |  |  |  |  |  |  |
Stated interest rates (as a percent) |  |  | 7.26% |  |  |  |  |
Unsecured notes |  |  |  |  |  |  |  |
Debt Obligations |  |  |  |  |  |  |  |
Total debt obligations |  |  | $ 1,737,500,000 |  | 2,112,500,000 |  |  |
Unsecured notes | 5.00% senior notes |  |  |  |  |  |  |  |
Debt Obligations |  |  |  |  |  |  |  |
Total debt obligations |  |  | $ 0 |  | $ 375,000,000 |  |  |
Stated interest rates (as a percent) |  |  | 5.00% |  | 5.00% |  |  |
Unsecured notes | 4.625% senior notes |  |  |  |  |  |  |  |
Debt Obligations |  |  |  |  |  |  |  |
Total debt obligations |  |  | $ 400,000,000 |  | $ 400,000,000 |  |  |
Stated interest rates (as a percent) |  |  | 4.625% |  |  |  |  |
Unsecured notes | 6.50% senior notes |  |  |  |  |  |  |  |
Debt Obligations |  |  |  |  |  |  |  |
Total debt obligations |  |  | $ 275,000,000 |  | 275,000,000 |  |  |
Stated interest rates (as a percent) |  |  | 6.50% |  |  |  |  |
Unsecured notes | 6.00% senior notes |  |  |  |  |  |  |  |
Debt Obligations |  |  |  |  |  |  |  |
Total debt obligations |  |  | $ 375,000,000 |  | 375,000,000 |  |  |
Stated interest rates (as a percent) |  |  | 6.00% |  |  |  |  |
Unsecured notes | 5.25% senior notes |  |  |  |  |  |  |  |
Debt Obligations |  |  |  |  |  |  |  |
Total debt obligations |  |  | $ 400,000,000 |  | 400,000,000 |  |  |
Stated interest rates (as a percent) |  |  | 5.25% |  |  |  |  |
Unsecured notes | 3.125% senior convertible notes |  |  |  |  |  |  |  |
Debt Obligations |  |  |  |  |  |  |  |
Total debt obligations |  |  | $ 287,500,000 |  | $ 287,500,000 |  |  |
Debt obligations, net |  |  | $ 264,100,000 |  |  |  |  |
Stated interest rates (as a percent) |  |  | 3.125% |  |  | 3.125% |  |
Convertible debt, conversion ratio (in shares per par value) |  |  | 66.1052 |  |  |  |  |
Convertible debt, conversion ratio principal amount |  |  | $ 1,000 |  |  |  |  |
Convertible debt, conversion price (in dollars per share) |  |  | $ 15.13 |  |  |  |  |
Liability component of convertible debt |  | $ 221,800,000 |  |  |  | $ 34,000,000 |  |
Equity component of convertible debt |  | $ 22,500,000 |  |  |  | 3,400,000 |  |
Debt instrument, face amount |  |  |  |  |  | $ 37,500,000.0 |  |
Unamortized discount |  |  | $ 19,300,000 |  |  |  |  |
Contractual interest |  |  | 2,200,000 | 2,200,000 |  |  |  |
Amortization of debt discount |  |  | $ 1,200,000 | $ 1,200,000 |  |  |  |
Effective interest rate (percent) |  |  | 5.20% |  | 5.20% |  |  |
Other debt obligations | Trust preferred securities |  |  |  |  |  |  |  |
Debt Obligations |  |  |  |  |  |  |  |
Total debt obligations |  |  | $ 100,000,000 |  | $ 100,000,000 |  |  |
Other debt obligations | Trust preferred securities | LIBOR |  |  |  |  |  |  |  |
Debt Obligations |  |  |  |  |  |  |  |
Basis point spread on variable interest rate (as a percent) |  |  | 1.50% |  |  |  |  |

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- Definition Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=109500613&loc=SL6031897-161870 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(16)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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