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Exchangeable Senior Notes (Tables)
 6 Months Ended
Jun. 30, 2016
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:
 
June 30, 2016
 
December 31, 2015
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
$
63,172

 
$
85,364

Principal amount of liability component 2015 Notes
575,000

 
575,000

Unamortized discount - equity component - 2013 Notes
(1,568
)
 
(2,605
)
Unamortized discount - equity component - 2015 Notes
(19,481
)
 
(21,565
)
Unamortized cash discount - 2013 Notes
(374
)
 
(633
)
Unamortized debt issuance costs
(10,327
)
 
(11,698
)
Net carrying amount of liability components
$
606,422

 
$
623,863
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 June 30,
 
For the Six Months Ended June 30,
 
2016
 
2015
 
2016
 
2015
Contractual interest
$
4,867

 
$
1,484

 
$
9,749

 
$
2,968

Amortization of discount
1,240

 
696

 
2,473

 
1,393

Total interest expense recognized
$
6,107

 
$
2,180

 
$
12,222

 
$
4,361
Summary of Repurchase of Debt
Information about the repurchases is as follows:
 
February 2016
 
April 2016
Principal amount repurchased
$
19,639

 
$
2,553

Amount allocated to:
 
 
 
  Extinguishment of liability component
$
18,887

 
$
2,474

  Reacquisition of equity component
12,132

 
1,766

Total consideration paid for repurchase
$
31,019

 
$
4,240

Exchangeable senior notes repurchased
$
19,639

 
$
2,553

Extinguishment of liability component
(18,887
)
 
(2,474
)
Discount on exchangeable senior notes
(716
)
 
(72
)
Related debt issuance costs
(36
)
 
(7
)
Gain/(loss) on repurchase
$
—

 
$
—