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Debt (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Dec. 31, 2019
Long term debt and capital lease obligations      
Current $ 23,588   $ 22,746
Debt 319,521   272,751
Finance Lease, Interest Expense 1,005 $ 1,107  
Interest expenses incurred for various debt instruments      
Interest paid on Senior Notes due 2024 3,378 3,673  
Interest paid on Revolving Credit Facility 549 1,853  
Amortization of Debt Issuance Costs 381 342  
Accretion 0 179  
Interest Expense, Other 35 0  
Capitalized interest (220) (700)  
Total interest expense, net of capitalized interest 5,128 $ 6,454  
Revolving Credit Facility      
Long term debt and capital lease obligations      
Debt [1] 50,000   0
Senior Notes due 2024      
Long term debt and capital lease obligations      
Debt [2] 227,062   226,885
Capital Lease Obligations      
Long term debt and capital lease obligations      
Debt     45,866
Debt, non-current 42,459   45,866
Revolving Credit Facility      
Long term debt and capital lease obligations      
Current [1] 0   0
Senior Notes due 2024      
Long term debt and capital lease obligations      
Current [2] 0   0
Capital Lease Obligations      
Long term debt and capital lease obligations      
Current $ 23,588   $ 22,746
Revolving Credit Facility      
Long term debt and capital lease obligations      
Stated interest rate 3.40%    
[1] Unamortized debt issuance costs of $2.1 million and $2.3 million at March 31, 2020 and December 31, 2019, respectively, included in Other Non-Current Assets.
[2] Net of unamortized debt issuance costs of $2.9 million and $3.1 million at March 31, 2020 and December 31, 2019, respectively.