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Supplemental Guarantor Information Condensed Consolidated Statements of Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2018 | Mar. 31, 2017
Condensed Financial Statements, Captions [Line Items] |  |  |
Revenues |  | $ 163,267 | $ 185,554
Costs applicable to sales | [1] | 99,340 | 114,490
Amortization |  | 30,777 | 38,693
General and Administrative Expense |  | 8,804 | 10,125
Exploration |  | 6,683 | 5,252
Pre-development, reclamation, and other |  | 4,225 | 3,837
Total costs and expenses |  | 149,829 | 172,397
Gain (loss) on derivative instruments |  | 4,987 | (1,200)
Other, net |  | 180 | 20,799
Interest expense, net |  | (5,965) | (3,579)
Total other income (expense), net |  | (798) | 16,020
Total |  | 12,640 | 29,177
Income and mining tax benefit (expense) |  | (11,949) | (10,878)
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest |  | 691 | 18,299
Income (Loss) from Equity Method Investments |  | 0 | 0
Income (Loss) from Discontinued Operations, Net of Tax, Attributable to Parent |  | 550 | 364
Net income (loss) |  | 1,241 | 18,663
Unrealized gain (loss) on available for sale securities |  | (278) | (2,182)
Other Comprehensive (Income) Loss, Reclassification Adjustment from AOCI for Write-down of Securities, Net of Tax |  | 0 | 121
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Net of Tax |  | 0 | 1,471
Other comprehensive income (loss) |  | (278) | (590)
COMPREHENSIVE INCOME (LOSS) |  | 963 | 18,073
Revenue |  | 163,267 | 185,554
Guarantor Subsidiaries |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |
Revenues |  | 93,230 | 107,194
Costs applicable to sales |  | 68,245 | 71,202
Amortization |  | 14,205 | 18,104
General and Administrative Expense |  | 3 | 24
Exploration |  | 2,245 | 1,727
Pre-development, reclamation, and other |  | 1,947 | 1,781
Total costs and expenses |  | 86,645 | 92,838
Gain (loss) on derivative instruments |  | (292) | (1,200)
Other, net |  | (137) | 5,458
Interest expense, net |  | (353) | (175)
Total other income (expense), net |  | (782) | 4,083
Total |  | 5,803 | 18,439
Income and mining tax benefit (expense) |  | (1,120) | (2,434)
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest |  | 4,683 | 16,005
Income (Loss) from Equity Method Investments |  | (38) | 70
Income (Loss) from Discontinued Operations, Net of Tax, Attributable to Parent |  | (284) | 0
Net income (loss) |  | 4,361 | 16,075
Unrealized gain (loss) on available for sale securities |  | 0 | (279)
Other Comprehensive (Income) Loss, Reclassification Adjustment from AOCI for Write-down of Securities, Net of Tax |  |  | 121
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Net of Tax |  |  | (369)
Other comprehensive income (loss) |  |  | (527)
COMPREHENSIVE INCOME (LOSS) |  | 4,361 | 15,548
Non-Guarantor Subsidiaries |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |
Revenues |  | 70,037 | 78,360
Costs applicable to sales |  | 31,095 | 43,288
Amortization |  | 16,326 | 20,265
General and Administrative Expense |  | 4 | (5)
Exploration |  | 3,979 | 3,189
Pre-development, reclamation, and other |  | 1,872 | 1,881
Total costs and expenses |  | 53,276 | 68,618
Gain (loss) on derivative instruments |  | 0 | 0
Other, net |  | (106) | 1,533
Interest expense, net |  | (4,248) | (1,539)
Total other income (expense), net |  | (4,354) | (6)
Total |  | 12,407 | 9,736
Income and mining tax benefit (expense) |  | (12,467) | (10,032)
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest |  | (60) | (296)
Income (Loss) from Equity Method Investments |  | (170) | (67)
Income (Loss) from Discontinued Operations, Net of Tax, Attributable to Parent |  | (175) | 364
Net income (loss) |  | (405) | 1
Unrealized gain (loss) on available for sale securities |  | 0 | 0
Other Comprehensive (Income) Loss, Reclassification Adjustment from AOCI for Write-down of Securities, Net of Tax |  |  | 0
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Net of Tax |  |  | 0
Other comprehensive income (loss) |  |  | 0
COMPREHENSIVE INCOME (LOSS) |  | (405) | 1
Parent Company [Member] |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |
Revenues |  | 0 | 0
Costs applicable to sales |  | 0 | 0
Amortization |  | 246 | 324
General and Administrative Expense |  | 8,797 | 10,106
Exploration |  | 459 | 336
Pre-development, reclamation, and other |  | 406 | 175
Total costs and expenses |  | 9,908 | 10,941
Gain (loss) on derivative instruments |  | 5,279 | 0
Other, net |  | 4,142 | 15,222
Interest expense, net |  | (5,083) | (3,279)
Total other income (expense), net |  | 4,338 | 11,943
Total |  | (5,570) | 1,002
Income and mining tax benefit (expense) |  | 1,638 | 1,588
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest |  | (3,932) | 2,590
Income (Loss) from Equity Method Investments |  | 4,164 | 16,073
Income (Loss) from Discontinued Operations, Net of Tax, Attributable to Parent |  | 1,009 | 0
Net income (loss) |  | 1,241 | 18,663
Unrealized gain (loss) on available for sale securities |  | (278) | (2,182)
Other Comprehensive (Income) Loss, Reclassification Adjustment from AOCI for Write-down of Securities, Net of Tax |  |  | 121
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Net of Tax |  |  | 1,471
Other comprehensive income (loss) |  |  | (590)
COMPREHENSIVE INCOME (LOSS) |  | 963 | 18,073
Eliminations |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |
Revenues |  | 0 | 0
Costs applicable to sales |  | 0 | 0
Amortization |  | 0 | 0
General and Administrative Expense |  | 0 | 0
Exploration |  | 0 | 0
Pre-development, reclamation, and other |  | 0 | 0
Total costs and expenses |  | 0 | 0
Gain (loss) on derivative instruments |  | 0 | 0
Other, net |  | (3,719) | (1,414)
Interest expense, net |  | 3,719 | 1,414
Total other income (expense), net |  | 0 | 0
Total |  | 0 | 0
Income and mining tax benefit (expense) |  | 0 | 0
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest |  | 0 | 0
Income (Loss) from Equity Method Investments |  | (3,956) | (16,076)
Income (Loss) from Discontinued Operations, Net of Tax, Attributable to Parent |  | 0 | 0
Net income (loss) |  | (3,956) | (16,076)
Unrealized gain (loss) on available for sale securities |  | 0 | 279
Other Comprehensive (Income) Loss, Reclassification Adjustment from AOCI for Write-down of Securities, Net of Tax |  |  | (121)
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Net of Tax |  |  | 369
Other comprehensive income (loss) |  |  | 527
COMPREHENSIVE INCOME (LOSS) |  | $ (3,956) | $ (15,549)
[1] | Excludes amortization.

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