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Debt (Tables)
 3 Months Ended
Mar. 31, 2018
Debt Disclosure [Abstract]  
Schedule of Components of Long-term Debt
Long-term debt is comprised of the following:
 
 
March 31,
2018
 
December 31, 2017
10.75% senior secured notes due April 15, 2022 ($440.0 million face value less unamortized discount and fees of $9.8 million and $10.4 million at March 31, 2018 and December 31, 2017, respectively)
 
$
430.2

 
$
429.6

5.50% convertible senior notes due March 1, 2021 ($213.5 million face value less unamortized discount and fees of $25.3 million and $27.2 million at March 31, 2018 and December 31, 2017, respectively)
 
188.2

 
186.3

Capital leases
 
7.7

 
7.5

Other debt
 
20.7

 
21.3

Total
 
646.8

 
644.7

Less – current maturities
 
10.6

 
10.8

Total long-term debt
 
$
636.2

 
$
633.9

See Note 9 for the fair value of the notes in the table above.
Schedule of Interest Expense
Interest expense related to the 2021 notes for the three month periods ended March 31, 2018 and 2017 was as follows:
 
 
Three Months Ended March 31,
 
 
2018
 
2017
Contractual interest coupon
 
$
2.9

 
$
2.9

Amortization of debt discount
 
1.6

 
1.5

Amortization of debt issuance costs
 
0.3

 
0.3

Total
 
$
4.8

 
$
4.7