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Exchangeable Senior Notes (Tables)
 6 Months Ended
Jun. 30, 2019
Debt Disclosure [Abstract]  
Schedule of information about total carrying amounts of equity components, principal amounts of liability components, unamortized discounts and net carrying amounts for notes

Information about the Company’s 2015 Notes, including the total carrying amount of the equity component, the principal amount of the liability component, the unamortized discount and the net carrying amount was as follows for the periods indicated:
 
June 30, 2019
 
December 31, 2018
Carrying amount of equity component
$
22,597

 
$
22,597

Principal amount of liability component
575,000

 
575,000

Unamortized discount - equity component
(6,070
)
 
(8,417
)
Unamortized debt issuance costs
(3,010
)
 
(4,209
)
Net carrying amount of liability components
$
565,920

 
$
562,374
Summary of amount of interest cost recognized relating to contractual interest rates and amortization of discounts on liability components of notes
The amount of interest cost recognized relating to the contractual interest rate and the amortization of the discount on the liability component of the 2015 Notes were as follows for the periods indicated:
 
For the Three Months Ended June 30,
 
For the Six Months Ended June 30,
 
2019
 
2018
 
2019
 
2018
Contractual interest
$
4,492

 
$
4,561

 
$
8,984

 
$
9,122

Amortization of discount
1,185

 
1,176

 
2,347

 
2,385

Total interest expense recognized
$
5,677

 
$
5,737

 
$
11,331

 
$
11,507