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Guarantor Subsidiaries (Consolidating Balance Sheet) (Details) - USD ($) $ in Thousands | Sep. 30, 2016 | Dec. 31, 2015 | Sep. 30, 2015 | Dec. 31, 2014
--- | --- | --- | --- | ---
Current assets |  |  |  |
Cash and cash equivalents | $ 206,692 | $ 102,335 | $ 65,302 |
Accounts receivable—trade, less allowance for doubtful accounts of $1,988 in 2016 | 139,692 | 136,253 |  |
Inventories, at lower of cost or market | 152,542 | 155,906 |  |
Prepaid expenses and other current assets | 29,153 | 41,173 |  |
Total current assets | 528,079 | 435,667 |  |
Property, plant and equipment, at cost less accumulated depreciation and amortization of $756,305 in 2016 | 1,488,261 | 1,369,318 |  |
Restricted cash | 0 | 68,571 |  |
Investments in subsidiaries | 0 | 0 |  |
Other assets | 40,489 | 12,685 |  |
Total assets | 2,056,829 | 1,886,241 |  |
Current liabilities |  |  |  |
Current maturities of long-term debt | 40,471 | 222 |  |
Inter-company accounts payable | 0 | 0 |  |
Trade accounts payable and accrued liabilities | 376,897 | 390,341 |  |
Deferred income taxes | 0 | 1,729 |  |
Total current liabilities | 417,368 | 392,292 |  |
Long-term debt, including capitalized lease obligations | 638,911 | 490,160 |  |
Deferred income taxes | 200,601 | 161,236 |  |
Asset retirement obligations | 25,637 | 24,345 |  |
Deferred credits and other liabilities | 15,125 | 25,918 |  |
Total liabilities | 1,297,642 | 1,093,951 |  |
Stockholders' Equity |  |  |  |
Preferred Stock, par $0.01 (authorized 20,000,000 shares, none outstanding) | 0 | 0 |  |
Common Stock, par $0.01 (authorized 200,000,000 shares, 46,767,164 shares issued at September 30, 2016) | 468 | 468 |  |
Treasury Stock (8,167,623 shares held at September 30, 2016) | (497,111) | (294,139) |  |
Additional paid in capital (APIC) | 550,376 | 558,182 |  |
Retained earnings | 705,454 | 527,779 |  |
Total stockholders' equity | 759,187 | 792,290 | 723,440 | $ 858,705
Total liabilities and stockholders' equity | 2,056,829 | 1,886,241 |  |
Eliminations |  |  |  |
Current assets |  |  |  |
Cash and cash equivalents | 0 | 0 | 0 |
Accounts receivable—trade, less allowance for doubtful accounts of $1,988 in 2016 | 0 | 0 |  |
Inventories, at lower of cost or market | 0 | 0 |  |
Prepaid expenses and other current assets | 0 | 0 |  |
Total current assets | 0 | 0 |  |
Property, plant and equipment, at cost less accumulated depreciation and amortization of $756,305 in 2016 | 0 | 0 |  |
Restricted cash | 0 | 0 |  |
Investments in subsidiaries | (2,079,212) | (1,901,538) |  |
Other assets | 0 | 0 |  |
Total assets | (2,079,212) | (1,901,538) |  |
Current liabilities |  |  |  |
Current maturities of long-term debt | 0 | 0 |  |
Inter-company accounts payable | 0 | 0 |  |
Trade accounts payable and accrued liabilities | 0 | 0 |  |
Deferred income taxes | 0 | 0 |  |
Total current liabilities | 0 | 0 |  |
Long-term debt, including capitalized lease obligations | 0 | 0 |  |
Deferred income taxes |  | 0 |  |
Asset retirement obligations | 0 | 0 |  |
Deferred credits and other liabilities | 0 | 0 |  |
Total liabilities | 0 | 0 |  |
Stockholders' Equity |  |  |  |
Preferred Stock, par $0.01 (authorized 20,000,000 shares, none outstanding) | 0 | 0 |  |
Common Stock, par $0.01 (authorized 200,000,000 shares, 46,767,164 shares issued at September 30, 2016) | (61) | (61) |  |
Treasury Stock (8,167,623 shares held at September 30, 2016) | 0 | 0 |  |
Additional paid in capital (APIC) | (1,368,384) | (1,368,384) |  |
Retained earnings | (710,767) | (533,093) |  |
Total stockholders' equity | (2,079,212) | (1,901,538) |  |
Total liabilities and stockholders' equity | (2,079,212) | (1,901,538) |  |
Parent Company |  |  |  |
Current assets |  |  |  |
Cash and cash equivalents | 0 | 0 | 0 |
Accounts receivable—trade, less allowance for doubtful accounts of $1,988 in 2016 | 0 | 0 |  |
Inventories, at lower of cost or market | 0 | 0 |  |
Prepaid expenses and other current assets | 0 | 0 |  |
Total current assets | 0 | 0 |  |
Property, plant and equipment, at cost less accumulated depreciation and amortization of $756,305 in 2016 | 0 | 0 |  |
Restricted cash | 0 | 0 |  |
Investments in subsidiaries | 1,934,292 | 1,756,617 |  |
Other assets | 0 | 0 |  |
Total assets | 1,934,292 | 1,756,617 |  |
Current liabilities |  |  |  |
Current maturities of long-term debt | 0 | 0 |  |
Inter-company accounts payable | 512,372 | 300,044 |  |
Trade accounts payable and accrued liabilities | 0 | 0 |  |
Deferred income taxes | 0 | 0 |  |
Total current liabilities | 512,372 | 300,044 |  |
Long-term debt, including capitalized lease obligations | 0 | 0 |  |
Deferred income taxes | 0 | 0 |  |
Asset retirement obligations | 0 | 0 |  |
Deferred credits and other liabilities | 0 | 0 |  |
Total liabilities | 512,372 | 300,044 |  |
Stockholders' Equity |  |  |  |
Preferred Stock, par $0.01 (authorized 20,000,000 shares, none outstanding) | 0 | 0 |  |
Common Stock, par $0.01 (authorized 200,000,000 shares, 46,767,164 shares issued at September 30, 2016) | 468 | 468 |  |
Treasury Stock (8,167,623 shares held at September 30, 2016) | (497,111) | (294,139) |  |
Additional paid in capital (APIC) | 1,213,109 | 1,222,465 |  |
Retained earnings | 705,454 | 527,779 |  |
Total stockholders' equity | 1,421,920 | 1,456,573 |  |
Total liabilities and stockholders' equity | 1,934,292 | 1,756,617 |  |
Issuer |  |  |  |
Current assets |  |  |  |
Cash and cash equivalents | 206,692 | 102,335 | 65,302 |
Accounts receivable—trade, less allowance for doubtful accounts of $1,988 in 2016 | 139,692 | 136,253 |  |
Inventories, at lower of cost or market | 152,542 | 155,906 |  |
Prepaid expenses and other current assets | 29,153 | 41,173 |  |
Total current assets | 528,079 | 435,667 |  |
Property, plant and equipment, at cost less accumulated depreciation and amortization of $756,305 in 2016 | 1,488,261 | 1,369,318 |  |
Restricted cash | 0 | 68,571 |  |
Investments in subsidiaries | 144,920 | 144,921 |  |
Other assets | 40,489 | 12,685 |  |
Total assets | 2,201,749 | 2,031,162 |  |
Current liabilities |  |  |  |
Current maturities of long-term debt | 40,471 | 222 |  |
Inter-company accounts payable | (305,973) | (93,644) |  |
Trade accounts payable and accrued liabilities | 376,897 | 390,341 |  |
Deferred income taxes | 0 | 1,729 |  |
Total current liabilities | 111,395 | 298,648 |  |
Long-term debt, including capitalized lease obligations | 638,911 | 490,160 |  |
Deferred income taxes | 200,601 | 161,236 |  |
Asset retirement obligations | 25,637 | 24,345 |  |
Deferred credits and other liabilities | 15,125 | 25,918 |  |
Total liabilities | 991,669 | 1,000,307 |  |
Stockholders' Equity |  |  |  |
Preferred Stock, par $0.01 (authorized 20,000,000 shares, none outstanding) | 0 | 0 |  |
Common Stock, par $0.01 (authorized 200,000,000 shares, 46,767,164 shares issued at September 30, 2016) | 1 | 1 |  |
Treasury Stock (8,167,623 shares held at September 30, 2016) | 0 | 0 |  |
Additional paid in capital (APIC) | 566,104 | 564,554 |  |
Retained earnings | 643,975 | 466,300 |  |
Total stockholders' equity | 1,210,080 | 1,030,855 |  |
Total liabilities and stockholders' equity | 2,201,749 | 2,031,162 |  |
Guarantor Subsidiaries |  |  |  |
Current assets |  |  |  |
Cash and cash equivalents | 0 | 0 | 0 |
Accounts receivable—trade, less allowance for doubtful accounts of $1,988 in 2016 | 0 | 0 |  |
Inventories, at lower of cost or market | 0 | 0 |  |
Prepaid expenses and other current assets | 0 | 0 |  |
Total current assets | 0 | 0 |  |
Property, plant and equipment, at cost less accumulated depreciation and amortization of $756,305 in 2016 | 0 | 0 |  |
Restricted cash | 0 | 0 |  |
Investments in subsidiaries | 0 | 0 |  |
Other assets | 0 | 0 |  |
Total assets | 0 | 0 |  |
Current liabilities |  |  |  |
Current maturities of long-term debt | 0 | 0 |  |
Inter-company accounts payable | (52,061) | (52,062) |  |
Trade accounts payable and accrued liabilities | 0 | 0 |  |
Deferred income taxes | 0 | 0 |  |
Total current liabilities | (52,061) | (52,062) |  |
Long-term debt, including capitalized lease obligations | 0 | 0 |  |
Deferred income taxes | 0 | 0 |  |
Asset retirement obligations | 0 | 0 |  |
Deferred credits and other liabilities | 0 | 0 |  |
Total liabilities | (52,061) | (52,062) |  |
Stockholders' Equity |  |  |  |
Preferred Stock, par $0.01 (authorized 20,000,000 shares, none outstanding) | 0 | 0 |  |
Common Stock, par $0.01 (authorized 200,000,000 shares, 46,767,164 shares issued at September 30, 2016) | 60 | 60 |  |
Treasury Stock (8,167,623 shares held at September 30, 2016) | 0 | 0 |  |
Additional paid in capital (APIC) | 52,004 | 52,004 |  |
Retained earnings | (3) | (2) |  |
Total stockholders' equity | 52,061 | 52,062 |  |
Total liabilities and stockholders' equity | 0 | 0 |  |
Non-Guarantor Subsidiaries |  |  |  |
Current assets |  |  |  |
Cash and cash equivalents | 0 | 0 | $ 0 |
Accounts receivable—trade, less allowance for doubtful accounts of $1,988 in 2016 | 0 | 0 |  |
Inventories, at lower of cost or market | 0 | 0 |  |
Prepaid expenses and other current assets | 0 | 0 |  |
Total current assets | 0 | 0 |  |
Property, plant and equipment, at cost less accumulated depreciation and amortization of $756,305 in 2016 | 0 | 0 |  |
Restricted cash | 0 | 0 |  |
Investments in subsidiaries | 0 | 0 |  |
Other assets | 0 | 0 |  |
Total assets | 0 | 0 |  |
Current liabilities |  |  |  |
Current maturities of long-term debt | 0 | 0 |  |
Inter-company accounts payable | (154,338) | (154,338) |  |
Trade accounts payable and accrued liabilities | 0 | 0 |  |
Deferred income taxes | 0 | 0 |  |
Total current liabilities | (154,338) | (154,338) |  |
Long-term debt, including capitalized lease obligations | 0 | 0 |  |
Deferred income taxes | 0 | 0 |  |
Asset retirement obligations | 0 | 0 |  |
Deferred credits and other liabilities | 0 | 0 |  |
Total liabilities | (154,338) | (154,338) |  |
Stockholders' Equity |  |  |  |
Preferred Stock, par $0.01 (authorized 20,000,000 shares, none outstanding) | 0 | 0 |  |
Common Stock, par $0.01 (authorized 200,000,000 shares, 46,767,164 shares issued at September 30, 2016) | 0 | 0 |  |
Treasury Stock (8,167,623 shares held at September 30, 2016) | 0 | 0 |  |
Additional paid in capital (APIC) | 87,543 | 87,543 |  |
Retained earnings | 66,795 | 66,795 |  |
Total stockholders' equity | 154,338 | 154,338 |  |
Total liabilities and stockholders' equity | $ 0 | $ 0 |  |

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