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Income Taxes (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Income Tax Disclosure [Abstract]    
Income from continuing operations before income tax provision: $ 5,837 $ 6,750
Statutory taxes at 35% 2,043 2,363
Other (142) 11
Tax Adjustments, Settlements, and Unusual Provisions (142) 11
NACoal percentage depletion (586) (603)
Foreign tax rate differential (24) (21)
Other 124 288
Effective Income Tax Rate Reconciliation Permanent Items (486) (336)
Income tax provision $ 1,415 $ 2,038
Effective income tax rate 24.20% 30.20%