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Exchangeable Senior Notes (Tables)
 9 Months Ended
Sep. 30, 2018
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 2013 Notes and 2015 Notes, including the total carrying amounts of the equity components, the principal amounts of the liability components, the unamortized discounts and the net carrying amounts was as follows for the periods indicated:
 
September 30, 2018
 
December 31, 2017
Carrying amount of equity component - 2013 Notes
$
—

 
$
—

Carrying amount of equity component - 2015 Notes
22,597

 
22,597

Carrying amount of equity components
$
22,597

 
$
22,597

Principal amount of liability component - 2013 Notes
$
—

 
$
49,259

Principal amount of liability component - 2015 Notes
575,000

 
575,000

Unamortized discount - equity component - 2013 Notes
—

 
(315
)
Unamortized discount - equity component - 2015 Notes
(9,579
)
 
(12,974
)
Unamortized cash discount - 2013 Notes
—

 
(74
)
Unamortized debt issuance costs
(4,808
)
 
(6,620
)
Net carrying amount of liability components
$
560,613

 
$
604,276
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 rates and the amortization of the discounts on the liability components of the Notes were as follows for the periods indicated:
 
For the Three Months Ended September 30,
 
For the Nine Months Ended September 30,
 
2018
 
2017
 
2018
 
2017
Contractual interest
$
4,492

 
$
4,785

 
$
13,614

 
$
14,519

Amortization of discount
1,140

 
1,268

 
3,525

 
3,827

Total interest expense recognized
$
5,632

 
$
6,053

 
$
17,139

 
$
18,346
Summary of repurchase of debt
Information about the repurchases is as follows:
 
For the Nine Months Ended September 30,
 
2018
 
2017
Principal amount repurchased
$
49,259

 
$
13,786

Amount allocated to:
 
 
 
  Extinguishment of liability component
$
49,019

 
$
13,568

  Reacquisition of equity component
31,251

 
6,285

Total consideration paid for repurchase
$
80,270

 
$
19,853

Exchangeable senior notes repurchased
$
49,259

 
$
13,786

Extinguishment of liability component
(49,019
)
 
(13,568
)
Discount on exchangeable senior notes
(230
)
 
(183
)
Related debt issuance costs
(10
)
 
(35
)
Gain/(loss) on repurchase
$
—

 
$
—