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Long-Term Debt (Tables)
 6 Months Ended
Jun. 30, 2018
Debt Instrument [Line Items]  
Schedule of long-term debt instruments
Long-term debt consists of the following:

  
June 30, 2018
  
December 31, 2017
 
       
Credit facility
 
$
96,000
  
$
150,000
 
Convertible senior debentures, due 2040
  
22,331
   
110,412
 
Convertible senior debentures, due 2041
  
57,275
   
56,641
 
Convertible senior debentures, due 2042
  
34,065
   
62,518
 
Convertible notes, due 2025
  
488,518
   
-
 
Deferred financing costs
  
(18,591
)
  
(9,101
)
   
679,598
   
370,470
 
Less current portion
  
-
   
-
 
  
$
679,598
  
$
370,470
 
Convertible Senior Notes, Due 2025 [Member]  
Debt Instrument [Line Items]  
Convertible debentures, interest expense
Interest expense for the fiscal quarter and six fiscal months ended June 30, 2018 related to the convertible notes is reflected on the consolidated statement of operations as follows:

 
Contractual
coupon interest
 
Non-cash amortization of debt discount
 
Non-cash amortization of deferred financing costs
 
Total interest expense related to the debentures
 
Due 2025
 
$
713
   
556
   
151
  
$
1,420
 
Liability and equity of component of convertible senior debentures
The carrying values of the liability and equity components of the convertible notes are reflected in the Company's consolidated balance sheets as follows:

  
Principal amount of the notes
  
Unamortized discount
  
Carrying value of liability component
  
Equity component - net carrying value
 
June 30, 2018
            
Due 2025
 
$
600,000
   
(111,482
)
 
$
488,518
  
$
85,262
 
Convertible senior debentures [Member]  
Debt Instrument [Line Items]  
Convertible debentures, interest expense
Interest expense related to the debentures is reflected on the consolidated condensed statements of operations for the fiscal quarters ended:

  
Contractual
coupon interest
  
Non-cash amortization of debt discount
  
Non-cash amortization of deferred financing costs
  
Non-cash change in value of derivative liability
  
Total interest expense related to the debentures
 
June 30, 2018
               
Due 2040
 
$
1,134
   
483
   
16
   
(33
)
 
$
1,600
 
Due 2041
 
$
844
   
341
   
12
   
(97
)
 
$
1,100
 
Due 2042
 
$
714
   
275
   
11
   
(26
)
 
$
974
 
Total
 
$
2,692
  
$
1,099
  
$
39
  
$
(156
)
 
$
3,674
 
                     
July 1, 2017
                    
Due 2040
 
$
1,547
   
613
   
22
   
(19
)
 
$
2,163
 
Due 2041
 
$
844
   
314
   
12
   
6
  
$
1,176
 
Due 2042
 
$
844
   
306
   
14
   
12
  
$
1,176
 
Total
 
$
3,235
  
$
1,233
  
$
48
  
$
(1
)
 
$
4,515
 

Interest expense related to the debentures is reflected on the consolidated condensed statements of operations for the six fiscal months ended:

  
Contractual
coupon interest
  
Non-cash amortization of debt discount
  
Non-cash amortization of deferred financing costs
  
Non-cash change in value of derivative liability
  
Total interest expense related to the debentures
 
June 30, 2018
               
Due 2040
 
$
2,681
   
1,134
   
38
   
61
  
$
3,914
 
Due 2041
 
$
1,688
   
675
   
24
   
(41
)
 
$
2,346
 
Due 2042
 
$
1,558
   
599
   
24
   
(15
)
 
$
2,166
 
Total
 
$
5,927
  
$
2,408
  
$
86
  
$
5
  
$
8,426
 
                     
July 1, 2017
                    
Due 2040
 
$
3,094
   
1,215
   
44
   
(44
)
 
$
4,309
 
Due 2041
 
$
1,688
   
622
   
24
   
8
  
$
2,342
 
Due 2042
 
$
1,688
   
607
   
27
   
8
  
$
2,330
 
Total
 
$
6,470
  
$
2,444
  
$
95
  
$
(28
)
 
$
8,981
 
Liability and equity of component of convertible senior debentures
The carrying values of the liability and equity components of the convertible debentures are reflected in the Company's consolidated condensed balance sheets as follows:

  
Principal amount of
the debentures
  
Unamortized discount
  
Embedded derivative
  
Carrying value of liability component
  
Equity component (including temporary equity) - net carrying value
 
June 30, 2018
               
Due 2040
 
$
55,000
   
(32,696
)
  
27
  
$
22,331
  
$
22,019
 
Due 2041
 
$
150,000
   
(92,898
)
  
173
  
$
57,275
  
$
62,246
 
Due 2042
 
$
80,940
   
(46,919
)
  
44
  
$
34,065
  
$
31,229
 
Total
 
$
285,940
  
$
(172,513
)
 
$
244
  
$
113,671
  
$
115,494
 
                     
December 31, 2017
                    
Due 2040
 
$
275,000
   
(164,794
)
  
206
  
$
110,412
  
$
110,094
 
Due 2041
 
$
150,000
   
(93,573
)
  
214
  
$
56,641
  
$
62,246
 
Due 2042
 
$
150,000
   
(87,600
)
  
118
  
$
62,518
  
$
57,874
 
Total
 
$
575,000
  
$
(345,967
)
 
$
538
  
$
229,571
  
$
230,214
 
Key terms of the convertible debentures
The following table summarizes some key facts and terms regarding the three series of outstanding convertible senior debentures following the adjustment made to the conversion rate of the debentures on the ex-dividend date of the June 28, 2018 dividend payment:

  
Due 2040
  
Due 2041
  
Due 2042
 
Issuance date
 
November 9, 2010
  
May 13, 2011
  
May 31, 2012
 
Maturity date
 
November 15, 2040
  
May 15, 2041
  
June 1, 2042
 
Principal amount as of June 30, 2018
 
$
55,000
  
$
150,000
  
$
80,940
 
Cash coupon rate (per annum)
  
2.25
%
  
2.25
%
  
2.25
%
Nonconvertible debt borrowing rate at issuance (per annum)
  
8.00
%
  
8.375
%
  
7.50
%
Conversion rate effective June 12, 2018 (per $1 principal amount)
  
77.7399
   
56.7305
   
91.4035
 
Effective conversion price effective June 12, 2018 (per share)
 
$
12.86
  
$
17.63
  
$
10.94
 
130% of the conversion price (per share)
 
$
16.72
  
$
22.92
  
$
14.22
 
Call date
 
November 20, 2020
  
May 20, 2021
  
June 7, 2022