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Supplemental Guarantor Information Condensed Consolidated Statements of Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2017 | Jun. 30, 2016 | Jun. 30, 2017 | Jun. 30, 2016
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |  |  |
Revenues | $ 173,354 |  | $ 182,007 |  | $ 379,492 |  | $ 330,394 |
Costs applicable to sales | 125,621 | [1] | 100,465 | [2] | 258,333 | [3] | 202,020 | [4]
Amortization | 32,946 |  | 37,505 |  | 73,050 |  | 65,470 |
General and Administrative Expense | 7,042 |  | 7,400 |  | 17,175 |  | 15,676 |
Exploration Expense, Mining | 7,813 |  | 2,233 |  | 13,065 |  | 3,963 |
Write-downs | 0 |  | 0 |  | 0 |  | 4,446 |
Pre-development, reclamation, and other | 4,366 |  | 4,364 |  | 8,947 |  | 8,568 |
Total costs and expenses | 177,788 |  | 151,967 |  | 370,570 |  | 300,143 |
Gain (Loss) on Extinguishment of Debt | (9,342) |  | 0 |  | (9,342) |  | 0 |
Gain (loss) on derivative instruments | 336 |  | (3,579) |  | (864) |  | (12,274) |
Other, net | 4,136 |  | (1,857) |  | 25,275 |  | (543) |
Interest expense, net | (3,749) |  | (10,875) |  | (7,335) |  | (21,995) |
Total other income (expense), net | (8,619) |  | (16,311) |  | 7,734 |  | (34,812) |
Income (loss) before income and mining taxes | (13,053) |  | 13,729 |  | 16,656 |  | (4,561) |
Income and mining tax benefit (expense) | 2,098 |  | 768 |  | (8,948) |  | (1,338) |
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest | (10,955) |  | 14,497 |  | 7,708 |  | (5,899) |
Income (Loss) from Equity Method Investments | 0 |  | 0 |  | 0 |  | 0 |
NET INCOME (LOSS) | (10,955) |  | 14,497 |  | 7,708 |  | (5,899) |
Unrealized gain (loss) on available for sale securities | (18) |  | 2,103 |  | (2,200) |  | 3,146 |
Other Comprehensive (Income) Loss, Reclassification Adjustment from AOCI for Write-down of Securities, Net of Tax | 305 |  | 20 |  | 426 |  | 20 |
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Net of Tax | (203) |  | (314) |  | 1,268 |  | 273 |
Other comprehensive income (loss) | 84 |  | 1,809 |  | (506) |  | 3,439 |
COMPREHENSIVE INCOME (LOSS) | (10,871) |  | 16,306 |  | 7,202 |  | (2,460) |
Guarantor Subsidiaries |  |  |  |  |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |  |  |
Revenues | 95,371 |  | 106,207 |  | 202,565 |  | 200,161 |
Costs applicable to sales | 67,916 | [1] | 58,674 | [2] | 139,118 | [3] | 121,038 | [4]
Amortization | 15,835 |  | 20,374 |  | 33,939 |  | 38,233 |
General and Administrative Expense | (4) |  | 203 |  | 20 |  | 221 |
Exploration Expense, Mining | 3,217 |  | 1,249 |  | 4,944 |  | 1,433 |
Write-downs |  |  |  |  |  |  | 0 |
Pre-development, reclamation, and other | 1,890 |  | 1,446 |  | 3,671 |  | 2,862 |
Total costs and expenses | 88,854 |  | 81,946 |  | 181,692 |  | 163,787 |
Gain (Loss) on Extinguishment of Debt | 0 |  |  |  | 0 |  |  |
Gain (loss) on derivative instruments | 336 |  | (2,686) |  | (864) |  | (4,935) |
Other, net | 2,477 |  | (2,193) |  | 7,935 |  | 61 |
Interest expense, net | (264) |  | (243) |  | (439) |  | (456) |
Total other income (expense), net | 2,549 |  | (5,122) |  | 6,632 |  | (5,330) |
Income (loss) before income and mining taxes | 9,066 |  | 19,139 |  | 27,505 |  | 31,044 |
Income and mining tax benefit (expense) | (938) |  | (1,595) |  | (3,372) |  | (1,902) |
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest | 8,128 |  | 17,544 |  | 24,133 |  | 29,142 |
Income (Loss) from Equity Method Investments | 1,139 |  | (674) |  | 1,209 |  | (5,153) |
NET INCOME (LOSS) | 9,267 |  | 16,870 |  | 25,342 |  | 23,989 |
Unrealized gain (loss) on available for sale securities | (469) |  | 2,103 |  | (748) |  | 3,079 |
Other Comprehensive (Income) Loss, Reclassification Adjustment from AOCI for Write-down of Securities, Net of Tax | 305 |  | 20 |  | 426 |  | 20 |
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Net of Tax | (203) |  | (314) |  | (572) |  | (695) |
Other comprehensive income (loss) | (367) |  | 1,809 |  | (894) |  | 2,404 |
COMPREHENSIVE INCOME (LOSS) | 8,900 |  | 18,679 |  | 24,448 |  | 26,393 |
Non-Guarantor Subsidiaries |  |  |  |  |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |  |  |
Revenues | 77,983 |  | 75,800 |  | 176,927 |  | 130,233 |
Costs applicable to sales | 57,705 | [1] | 41,791 | [2] | 119,215 | [3] | 80,982 | [4]
Amortization | 16,813 |  | 16,718 |  | 38,489 |  | 26,401 |
General and Administrative Expense | 86 |  | 101 |  | 89 |  | 279 |
Exploration Expense, Mining | 4,201 |  | 505 |  | 7,390 |  | 1,428 |
Write-downs |  |  |  |  |  |  | 4,446 |
Pre-development, reclamation, and other | 1,878 |  | 1,984 |  | 4,503 |  | 4,320 |
Total costs and expenses | 80,683 |  | 61,099 |  | 169,686 |  | 117,856 |
Gain (Loss) on Extinguishment of Debt | 0 |  |  |  | 0 |  |  |
Gain (loss) on derivative instruments | 0 |  | (840) |  | 0 |  | (5,704) |
Other, net | 1,071 |  | 143 |  | 2,944 |  | (110) |
Interest expense, net | (1,520) |  | (1,539) |  | (3,066) |  | (3,216) |
Total other income (expense), net | (449) |  | (2,236) |  | (122) |  | (9,030) |
Income (loss) before income and mining taxes | (3,149) |  | 12,465 |  | 7,119 |  | 3,347 |
Income and mining tax benefit (expense) | (359) |  | 2,611 |  | (10,559) |  | 1,021 |
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest | (3,508) |  | 15,076 |  | (3,440) |  | 4,368 |
Income (Loss) from Equity Method Investments | (238) |  | 0 |  | (305) |  | 0 |
NET INCOME (LOSS) | (3,746) |  | 15,076 |  | (3,745) |  | 4,368 |
Unrealized gain (loss) on available for sale securities | 0 |  | 0 |  | 0 |  | 0 |
Other Comprehensive (Income) Loss, Reclassification Adjustment from AOCI for Write-down of Securities, Net of Tax | 0 |  | 0 |  | 0 |  | 0 |
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Net of Tax | 0 |  | 0 |  | 0 |  | 0 |
Other comprehensive income (loss) | 0 |  | 0 |  | 0 |  | 0 |
COMPREHENSIVE INCOME (LOSS) | (3,746) |  | 15,076 |  | (3,745) |  | 4,368 |
Parent Company [Member] |  |  |  |  |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |  |  |
Revenues | 0 |  | 0 |  | 0 |  | 0 |
Costs applicable to sales | 0 | [1] | 0 | [2] | 0 | [3] | 0 | [4]
Amortization | 298 |  | 413 |  | 622 |  | 836 |
General and Administrative Expense | 6,960 |  | 7,096 |  | 17,066 |  | 15,176 |
Exploration Expense, Mining | 395 |  | 479 |  | 731 |  | 1,102 |
Write-downs |  |  |  |  |  |  | 0 |
Pre-development, reclamation, and other | 598 |  | 934 |  | 773 |  | 1,386 |
Total costs and expenses | 8,251 |  | 8,922 |  | 19,192 |  | 18,500 |
Gain (Loss) on Extinguishment of Debt | (9,342) |  |  |  | (9,342) |  |  |
Gain (loss) on derivative instruments | 0 |  | (53) |  | 0 |  | (1,635) |
Other, net | 2,000 |  | 1,341 |  | 17,222 |  | 1,679 |
Interest expense, net | (3,377) |  | (10,241) |  | (6,656) |  | (20,496) |
Total other income (expense), net | (10,719) |  | (8,953) |  | 1,224 |  | (20,452) |
Income (loss) before income and mining taxes | (18,970) |  | (17,875) |  | (17,968) |  | (38,952) |
Income and mining tax benefit (expense) | 3,395 |  | (248) |  | 4,983 |  | (457) |
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest | (15,575) |  | (18,123) |  | (12,985) |  | (39,409) |
Income (Loss) from Equity Method Investments | 4,620 |  | 32,620 |  | 20,693 |  | 33,510 |
NET INCOME (LOSS) | (10,955) |  | 14,497 |  | 7,708 |  | (5,899) |
Unrealized gain (loss) on available for sale securities | (18) |  | 2,103 |  | (2,200) |  | 3,146 |
Other Comprehensive (Income) Loss, Reclassification Adjustment from AOCI for Write-down of Securities, Net of Tax | 305 |  | 20 |  | 426 |  | 20 |
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Net of Tax | (203) |  | (314) |  | 1,268 |  | 273 |
Other comprehensive income (loss) | 84 |  | 1,809 |  | (506) |  | 3,439 |
COMPREHENSIVE INCOME (LOSS) | (10,871) |  | 16,306 |  | 7,202 |  | (2,460) |
Eliminations |  |  |  |  |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |  |  |
Revenues | 0 |  | 0 |  | 0 |  | 0 |
Costs applicable to sales | 0 | [1] | 0 | [2] | 0 | [3] | 0 | [4]
Amortization | 0 |  | 0 |  | 0 |  | 0 |
General and Administrative Expense | 0 |  | 0 |  | 0 |  | 0 |
Exploration Expense, Mining | 0 |  | 0 |  | 0 |  | 0 |
Write-downs |  |  | 0 |  |  |  | 0 |
Pre-development, reclamation, and other | 0 |  | 0 |  | 0 |  | 0 |
Total costs and expenses | 0 |  | 0 |  | 0 |  | 0 |
Gain (Loss) on Extinguishment of Debt | 0 |  |  |  | 0 |  |  |
Gain (loss) on derivative instruments | 0 |  | 0 |  | 0 |  | 0 |
Other, net | (1,412) |  | (1,148) |  | (2,826) |  | (2,173) |
Interest expense, net | 1,412 |  | 1,148 |  | 2,826 |  | 2,173 |
Total other income (expense), net | 0 |  | 0 |  | 0 |  | 0 |
Income (loss) before income and mining taxes | 0 |  | 0 |  | 0 |  | 0 |
Income and mining tax benefit (expense) | 0 |  | 0 |  | 0 |  | 0 |
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest | 0 |  | 0 |  | 0 |  | 0 |
Income (Loss) from Equity Method Investments | (5,521) |  | (31,946) |  | (21,597) |  | (28,357) |
NET INCOME (LOSS) | (5,521) |  | (31,946) |  | (21,597) |  | (28,357) |
Unrealized gain (loss) on available for sale securities | 469 |  | (2,103) |  | 748 |  | (3,079) |
Other Comprehensive (Income) Loss, Reclassification Adjustment from AOCI for Write-down of Securities, Net of Tax | (305) |  | (20) |  | (426) |  | (20) |
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Net of Tax | 203 |  | 314 |  | 572 |  | 695 |
Other comprehensive income (loss) | 367 |  | (1,809) |  | 894 |  | (2,404) |
COMPREHENSIVE INCOME (LOSS) | $ (5,154) |  | $ (33,755) |  | $ (20,703) |  | $ (30,761) |
[1] | Excludes amortization
[2] | Excludes amortization
[3] | Excludes amortization
[4] | Excludes amortization

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