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Exchangeable Senior Notes - (Tables)
 12 Months Ended
Dec. 31, 2016
Debt Disclosure [Abstract]  
Schedule of Information about Carrying Amount of Equity Component, Principal Amount of Liability Component, Unamortized Discount and Net Carrying Amount for Notes
Information about the carrying amount of the equity component, the principal amount of the liability component, its unamortized discount and its net carrying amount were as follows for the periods indicated:
 
December 31, 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
$
63,170

 
$
85,364

Principal amount of liability component - 2015 Notes
575,000

 
575,000

Unamortized discount - equity component - 2013 Notes
(1,187
)
 
(2,605
)
Unamortized discount - equity component - 2015 Notes
(17,355
)
 
(21,565
)
Unamortized cash discount - 2013 Notes
(281
)
 
(633
)
Unamortized debt issuance costs
(9,033
)
 
(11,698
)
Net carrying amount of liability components
$
610,314

 
$
623,863
Summary of Amount of Interest Cost Recognized Relating to Contractual Interest Rate and Amortization of Discount on Liability Component of Notes
The amount of interest cost recognized relating to the contractual interest rate and the amortization of the discount on the liability component for the 2013 Notes and 2015 Notes was as follows for the periods indicated:
 
For the Year Ended December 31,
 
2016
 
2015
 
2014
Contractual interest
$
19,483

 
$
9,939

 
$
5,936

Amortization of discount
4,980

 
3,310

 
2,683

Total interest expense recognized
$
24,463

 
$
13,249

 
$
8,619
Summary of Repurchase of Debt
Information about the repurchases is as follows:
 
February 2016
 
April 2016
 
September 2015
Principal amount repurchased
$
19,639

 
$
2,555

 
$
164,636

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

 
$
2,476

 
$
157,100

  Reacquisition of equity component
12,132

 
1,766

 
70,112

Total consideration paid for repurchase
$
31,019

 
$
4,242

 
$
227,212

Exchangeable senior notes repurchased
$
19,639

 
$
2,555

 
$
164,636

Extinguishment of liability component
(18,887
)
 
(2,476
)
 
(157,100
)
Discount on exchangeable senior notes
(716
)
 
(72
)
 
(6,931
)
Related debt issuance costs
(36
)
 
(7
)
 
(605
)
Gain/(loss) on repurchase
$
—

 
$
—

 
$
—