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Fair Value of Financial Instruments
 9 Months Ended
Sep. 30, 2018
Fair Value Disclosures [Abstract]  
Fair Value of Financial Instruments
Fair Value of Financial Instruments
The following table presents the carrying value and estimated fair value of our financial instruments not carried at fair value on the condensed consolidated balance sheet at September 30, 2018 and December 31, 2017 ($ in thousands):
 
September 30, 2018
 
December 31, 2017
 
Carrying
Value
 
Estimated
Fair Value
 
Carrying
Value
 
Estimated
Fair Value
Cash
$
99,188

 
$
99,188

 
$
77,671

 
$
77,671

Commercial first mortgage loans, net
3,723,550

 
3,720,475

 
2,653,826

 
2,657,262

Subordinate loans, net
1,104,496

 
1,098,632

 
1,025,932

 
1,029,390

Secured debt arrangements
(2,013,617
)
 
(2,013,617
)
 
(1,345,195
)
 
(1,345,195
)
2019 Notes
(35,477
)
 
(39,660
)
 
(251,935
)
 
(267,506
)
2022 Notes
(334,697
)
 
(345,863
)
 
(332,962
)
 
(350,175
)

To determine estimated fair values of the financial instruments listed above, market rates of interest, which include credit assumptions, are used to discount contractual cash flows. The estimated fair values are not necessarily indicative of the amount we could realize on disposition of the financial instruments. The use of different market assumptions or estimation methodologies could have a material effect on the estimated fair value amounts. Estimates of fair value for cash and convertible senior notes, net are measured using observable Level I inputs as defined in "Note 3 - Fair Value Disclosure." Estimates of fair value for all other financial instruments in the table above are measured using significant estimates, or unobservable Level III inputs as defined in "Note 3 - Fair Value Disclosure."