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Debt (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Long term debt and capital lease obligations      
Current $ 22,746 $ 24,937  
Debt 272,751 433,889  
Finance Lease, Interest Expense 4,150 2,270 $ 1,621
Interest expenses incurred for various debt instruments      
Interest paid on Senior Notes due 2024 14,586 14,688 8,608
Interest paid on Senior Notes due 2021 0 0 6,221
Interest paid on Revolving Credit Facility 5,358 5,854 885
Amortization of Debt Issuance Costs 1,491 1,302 809
Accretion 396 1,311 260
Interest Expense, Other 580 176 (29)
Capitalized interest (1,790) (1,237) (1,935)
Total interest expense, net of capitalized interest 24,771 24,364 $ 16,440
Revolving Credit Facility      
Long term debt and capital lease obligations      
Debt [1] 0 135,000  
Senior Notes due 2024      
Long term debt and capital lease obligations      
Debt [2] 226,885 245,854  
Capital Lease Obligations      
Long term debt and capital lease obligations      
Debt   53,035  
Debt, non-current 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 $ 22,746 $ 24,937  
Revolving Credit Facility      
Long term debt and capital lease obligations      
Stated interest rate 4.20%    
[1] Unamortized debt issuance costs of $2.3 million and $2.2 million at December 31, 2019 and December 31, 2018, respectively, included in Other Non-Current Assets.
[2] Net of unamortized debt issuance costs of $3.1 million and $4.1 million at December 31, 2019 and December 31, 2018, respectively.