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Long-Term Debt (Tables)
 12 Months Ended
Dec. 31, 2018
Long-Term Debt [Abstract]  
Aggregate annual maturities of long-term debt
Other Borrowings Information
Aggregate annual maturities of long-term debt, based on the terms stated in the respective agreements, are as follows:
2019
 
$
-
 
2020
  
-
 
2021
  
-
 
2022
  
-
 
2023
  
-
 
Thereafter
  
636,556
 
Debt Instrument [Line Items]  
Schedule of long-term debt instruments
Long-term debt consists of the following:

  
December 31, 2018
  
December 31, 2017
 
       
Credit facility
 
$
-
  
$
150,000
 
Convertible senior notes, due 2025
  
495,203
   
-
 
Convertible senior debentures, due 2040
  
539
   
110,412
 
Convertible senior debentures, due 2041
  
12,812
   
56,641
 
Convertible senior debentures, due 2042
  
923
   
62,518
 
Deferred financing costs
  
(14,968
)
  
(9,101
)
   
494,509
   
370,470
 
Less current portion
  
-
   
-
 
 
 
$
494,509
  
$
370,470
 
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 December 20, 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
 
$
1,310
  
$
33,078
  
$
2,168
 
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 December 5, 2018 (per $1 principal amount)
  
78.3806
   
57.1981
   
92.1569
 
Effective conversion price effective December 5, 2018 (per share)
 
$
12.76
  
$
17.48
  
$
10.85
 
130% of the conversion price (per share)
 
$
16.59
  
$
22.72
  
$
14.11
 
Call date
 
November 20, 2020
  
May 20, 2021
  
June 7, 2022
 
Convertible Senior Notes, Due 2025 [Member]  
Debt Instrument [Line Items]  
Liability and equity components of the convertible 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 (including temporary equity) - net carrying value
 
             
December 31, 2018
 
$
600,000
   
(104,797
)
 
$
495,203
  
$
85,262
 
Schedule of Interest Expense on Convertible Debt [Table Text Block]
Interest expense for the year ended December 31, 2018 related to the convertible notes due 2025 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 notes
 
           
$
7,463
   
7,240
   
1,059
  
$
15,762
 
Convertible senior debentures [Member]  
Debt Instrument [Line Items]  
Liability and equity components of the convertible debentures
The carrying values of the liability and equity components of the convertible debentures are reflected in the Company's accompanying consolidated 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
 
                
December 31, 2018
               
Due 2040
 
$
1,310
   
(772
)
  
1
  
$
539
  
$
528
 
Due 2041
 
$
33,078
   
(20,333
)
  
67
  
$
12,812
  
$
13,725
 
Due 2042
 
$
2,168
   
(1,247
)
  
2
  
$
923
  
$
839
 
Total
 
$
36,556
  
$
(22,352
)
 
$
70
  
$
14,274
  
$
15,092
 
                     
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
 
Schedule of Interest Expense on Convertible Debt [Table Text Block]
Interest expense related to the debentures is reflected on the accompanying consolidated statements of operations for the years ended December 31:

 
 
 
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
 
                
2018
               
Due 2040
 
$
3,150
   
1,340
   
45
   
81
  
$
4,616
 
Due 2041
 
$
3,156
   
1,285
   
45
   
43
  
$
4,529
 
Due 2042
 
$
2,321
   
904
   
36
   
4
  
$
3,265
 
Total
 
$
8,627
  
$
3,529
  
$
126
  
$
128
  
$
12,410
 
                     
2017
                    
Due 2040
 
$
6,188
   
2,479
   
88
   
(187
)
 
$
8,568
 
Due 2041
 
$
3,375
   
1,270
   
47
   
(71
)
 
$
4,621
 
Due 2042
 
$
3,375
   
1,235
   
54
   
(58
)
 
$
4,606
 
Total
 
$
12,938
  
$
4,984
  
$
189
  
$
(316
)
 
$
17,795
 
                     
2016
                    
Due 2040
 
$
6,188
   
2,292
   
88
   
(183
)
 
$
8,385
 
Due 2041
 
$
3,375
   
1,171
   
47
   
(153
)
 
$
4,440
 
Due 2042
 
$
3,375
   
1,147
   
54
   
(126
)
 
$
4,450
 
Total
 
$
12,938
  
$
4,610
  
$
189
  
$
(462
)
 
$
17,275