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Income Taxes (Income Tax Expense (Benefit)) (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Income Tax Disclosure [Abstract]        
Income tax provision (benefit) at statutory rate $ 16,375 $ 23,347 $ 37,245 $ 54,843
Percentage depletion allowance (5,964) (7,708) (13,059) (20,439)
State taxes, net of effect of federal taxes 4,528 728 5,865 1,619
Change in valuation allowance (44,278) (19,118) (62,234) (39,336)
Current expense associated with uncertain tax positions 511 1,127 (599) 2,762
Impact of Tax Cut and Jobs Act of 2017 (19,780) 0 (19,780) 0
Other, net 3,393 (19) 3,437 67
Benefit from income taxes 45,215 $ 1,643 $ 49,125 $ 484
Uncertain tax position charge $ 24,900