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Unconsolidated Subsidiaries (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Schedule of Equity Method Investments [Line Items]
Investment in unconsolidated subsidiaries	$ 24,611	$ 20,091
Unconsolidated mines | NACoal
Schedule of Equity Method Investments [Line Items]
Investment in unconsolidated subsidiaries	24,600	20,100
Maximum risk of loss	5,000	4,400
Statement of Operations
Revenue	734,515	766,558
Gross profit	72,433	76,600
Income before income taxes	65,183	66,270
Net income	54,067	55,247
Balance Sheet
Current assets	183,848	182,353
Non-current assets	837,477	860,049
Current liabilities	141,132	146,788
Non-current liabilities	875,216	891,175
Dividends from unconsolidated mines	$ 53,500	$ 56,000

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