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Supplemental Guarantor Information Condensed Consolidated Statements of Comprehensive Income (Loss) (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Condensed Financial Statements, Captions [Line Items]        
Revenues $ 175,963 $ 176,247 $ 555,455 $ 506,641
Costs applicable to sales [1] 118,924 105,408 377,257 307,428
Amortization 33,830 27,763 106,880 93,232
General and Administrative Expense 7,412 7,113 24,587 22,789
Exploration Expense, Mining 9,814 3,706 22,879 7,669
Write-downs 0 0 0 4,446
Pre-development, reclamation, and other 7,961 4,491 16,908 13,059
Total costs and expenses 177,941 148,481 548,511 448,623
Gain (Loss) on Extinguishment of Debt 0 (10,040) (9,342) (10,040)
Gain (loss) on derivative instruments 0 (961) (864) (13,235)
Other, net 3,164 6,405 28,439 5,862
Interest expense, net (3,606) (8,068) (10,941) (30,063)
Total other income (expense), net (442) (12,664) 7,292 (47,476)
Income (loss) before income and mining taxes (2,420) 15,102 14,236 10,542
Income and mining tax benefit (expense) (14,232) 54,455 (23,180) 53,118
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest (16,652) 69,557 (8,944) 63,660
Income (Loss) from Equity Method Investments 0 0 0 0
NET INCOME (LOSS) (16,652) 69,557 (8,944) 63,660
Unrealized gain (loss) on available for sale securities 1,066 1,387 (1,134) 4,533
Other Comprehensive (Income) Loss, Reclassification Adjustment from AOCI for Write-down of Securities, Net of Tax 0 0 426 20
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Net of Tax 32 (2,965) 1,300 (2,691)
Other comprehensive income (loss) 1,098 (1,578) 592 1,862
COMPREHENSIVE INCOME (LOSS) (15,554) 67,979 (8,352) 65,522
Guarantor Subsidiaries        
Condensed Financial Statements, Captions [Line Items]        
Revenues 99,093 117,426 301,658 317,587
Costs applicable to sales 68,267 [1] 68,189 207,385 189,227
Amortization 15,678 19,750 49,617 57,983
General and Administrative Expense 6 16 26 237
Exploration Expense, Mining 4,582 1,410 9,526 2,843
Write-downs       0
Pre-development, reclamation, and other 1,922 1,470 5,593 4,332
Total costs and expenses 90,455 90,835 272,147 254,622
Gain (Loss) on Extinguishment of Debt 0 0 0 0
Gain (loss) on derivative instruments 0 (852) (864) (5,787)
Other, net (4,603) 3,021 3,332 3,082
Interest expense, net (264) (209) (703) (665)
Total other income (expense), net (4,867) 1,960 1,765 (3,370)
Income (loss) before income and mining taxes 3,771 28,551 31,276 59,595
Income and mining tax benefit (expense) (574) 41,807 (3,946) 39,905
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest 3,197 70,358 27,330 99,500
Income (Loss) from Equity Method Investments (1,755) 328 (546) (4,825)
NET INCOME (LOSS) 1,442 70,686 26,784 94,675
Unrealized gain (loss) on available for sale securities 1,504 1,387 756 4,466
Other Comprehensive (Income) Loss, Reclassification Adjustment from AOCI for Write-down of Securities, Net of Tax (852) 0 (426) 20
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Net of Tax 1,112 (2,485) 540 (3,181)
Other comprehensive income (loss) 1,764 (1,098) 870 1,305
COMPREHENSIVE INCOME (LOSS) 3,206 69,588 27,654 95,980
Non-Guarantor Subsidiaries        
Condensed Financial Statements, Captions [Line Items]        
Revenues 76,870 58,821 253,797 189,054
Costs applicable to sales 50,657 [1] 37,219 169,872 118,201
Amortization 17,866 7,624 56,355 34,024
General and Administrative Expense 156 141 245 420
Exploration Expense, Mining 4,766 1,307 12,156 2,735
Write-downs       4,446
Pre-development, reclamation, and other 5,009 2,633 9,512 6,953
Total costs and expenses 78,454 48,924 248,140 166,779
Gain (Loss) on Extinguishment of Debt 0 0 0 0
Gain (loss) on derivative instruments 0 (109) 0 (5,813)
Other, net 6,312 3,178 9,256 3,068
Interest expense, net (1,535) (1,467) (4,601) (4,683)
Total other income (expense), net 4,777 1,602 4,655 (7,428)
Income (loss) before income and mining taxes 3,193 11,499 10,312 14,847
Income and mining tax benefit (expense) (5,567) 41,960 (16,126) 42,981
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest (2,374) 53,459 (5,814) 57,828
Income (Loss) from Equity Method Investments (304) 0 (609) 0
NET INCOME (LOSS) (2,678) 53,459 (6,423) 57,828
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) (2,678) 53,459 (6,423) 57,828
Parent Company [Member]        
Condensed Financial Statements, Captions [Line Items]        
Revenues 0 0 0 0
Costs applicable to sales 0 [1] 0 0 0
Amortization 286 389 908 1,225
General and Administrative Expense 7,250 6,956 24,316 22,132
Exploration Expense, Mining 466 989 1,197 2,091
Write-downs       0
Pre-development, reclamation, and other 1,030 388 1,803 1,774
Total costs and expenses 9,032 8,722 28,224 27,222
Gain (Loss) on Extinguishment of Debt 0 (10,040) (9,342) (10,040)
Gain (loss) on derivative instruments 0 0 0 (1,635)
Other, net 2,868 1,666 20,090 3,345
Interest expense, net (3,220) (7,852) (9,876) (28,348)
Total other income (expense), net (352) (16,226) 872 (36,678)
Income (loss) before income and mining taxes (9,384) (24,948) (27,352) (63,900)
Income and mining tax benefit (expense) (8,091) (29,312) (3,108) (29,768)
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest (17,475) (54,260) (30,460) (93,668)
Income (Loss) from Equity Method Investments 823 123,818 21,516 157,328
NET INCOME (LOSS) (16,652) 69,558 (8,944) 63,660
Unrealized gain (loss) on available for sale securities 1,066 1,387 (1,134) 4,533
Other Comprehensive (Income) Loss, Reclassification Adjustment from AOCI for Write-down of Securities, Net of Tax 0 0 426 20
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Net of Tax 32 (2,965) 1,300 (2,691)
Other comprehensive income (loss) 1,098 (1,578) 592 1,862
COMPREHENSIVE INCOME (LOSS) (15,554) 67,980 (8,352) 65,522
Eliminations        
Condensed Financial Statements, Captions [Line Items]        
Revenues 0 0 0 0
Costs applicable to sales 0 [1] 0 0 0
Amortization 0 0 0 0
General and Administrative Expense 0 0 0 0
Exploration Expense, Mining 0 0 0 0
Write-downs       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 0 0
Gain (loss) on derivative instruments 0 0 0 0
Other, net (1,413) (1,460) (4,239) (3,633)
Interest expense, net 1,413 1,460 4,239 3,633
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 1,236 (124,146) (20,361) (152,503)
NET INCOME (LOSS) 1,236 (124,146) (20,361) (152,503)
Unrealized gain (loss) on available for sale securities (1,504) (1,387) (756) (4,466)
Other Comprehensive (Income) Loss, Reclassification Adjustment from AOCI for Write-down of Securities, Net of Tax 852 0 426 (20)
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Net of Tax (1,112) 2,485 (540) 3,181
Other comprehensive income (loss) (1,764) 1,098 (870) (1,305)
COMPREHENSIVE INCOME (LOSS) $ (528) $ (123,048) $ (21,231) $ (153,808)
[1] Excludes amortization