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Debt (Tables)
12 Months Ended
Dec. 31, 2018
Debt Disclosure [Abstract]  
Components of Long-Term Debt
Long-term debt is comprised of the following:
As of December 31,
 
2018

 
2017

10.75% senior secured notes due April 15, 2022 ($440.0 million face value less unamortized discount and fees of $8.0 million and $10.4 million at December 31, 2018 and 2017, respectively)
 
$
432.0

 
$
429.6

5.50% convertible senior notes due March 1, 2021 ($213.5 million face value less unamortized discount and fees of $19.3 million and $27.2 million at December 31, 2018 and 2017, respectively)
 
194.2

 
186.3

Capital leases
 
5.8

 
7.5

Other debt
 
20.8

 
21.3

Total
 
652.8

 
644.7

Less – current maturities
 
10.0

 
10.8

Total long-term debt
 
$
642.8

 
$
633.9

Estimated Fair Values of Long-term Debt
Presented below are the estimated fair values of long-term debt as of December 31, 2018 and 2017.
As of December 31,
2018

 
2017

10.75% senior secured notes due April 15, 2022
$
486.8

 
$
492.8

5.50% convertible senior notes due March 1, 2021
298.5

 
237.9

Schedule of Maturities of Long-term Debt, Including Capital Leases
Maturities of long-term debt, including capital leases, in each of the next five years and thereafter are as follows:
Year
Total

 
Long-Term Debt

 
Capital Leases

2019
$
10.0

 
$
8.4

 
$
1.6

2020
2.5

 
0.9

 
1.6

2021
197.5

 
195.9

 
1.6

2022
434.8

 
433.8

 
1.0

2023
1.8

 
1.8

 

Thereafter
6.2

 
6.2

 

Total
$
652.8

 
$
647.0

 
$
5.8

Schedule of Cash Paid for Interest, Capitalized Interest, and Interest Expense
Cash paid for interest and capitalized interest expense during the three years ended December 31, 2018 was as follows:
Year ended December 31,
 
2018

 
2017

 
2016

Cash paid for interest
 
$
59.5

 
$
39.9

 
$
22.1

Capitalized interest expense
 
$
6.0

 
$
4.2

 
$
3.0

Interest expense related to the 2021 Notes is comprised of the following:
Year ended December 31,
2018

 
2017

 
2016

Contractual interest coupon
$
11.8

 
$
11.8

 
$
9.2

Amortization of debt discount
6.6

 
6.0

 
4.3

Amortization of debt issuance costs
1.2

 
1.2

 
1.0

Total
$
19.6

 
$
19.0

 
$
14.5

Interest expense related to the 2022 Notes is comprised of the following:
Year ended December 31,
2018

 
2017

 
2016

Contractual interest coupon
$
47.3

 
$
33.2

 
$

Amortization of debt issuance costs
2.4

 
1.7

 

Total
$
49.7

 
$
34.9

 
$