v3.8.0.1

Condensed Consolidating Financial Information - Guarantor Subsidiaries - Condensed Consolidating Balance Sheets (Detail) - USD ($) $ in Thousands | Sep. 30, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Dec. 31, 2015
--- | --- | --- | --- | ---
Current Assets: |  |  |  |
Cash | $ 2,991 | $ 2,596 | $ 2,639 | $ 2,407
Short-term investments | 204,036 | 289,806 |  |
Accounts receivable - net | 152,737 | 138,265 |  |
Inventories of spare parts – net | 79,245 | 70,402 |  |
Prepaid expenses | 12,006 | 9,259 |  |
Deferred income taxes | 10,798 | 10,798 |  |
Income taxes receivable | 509 | 540 |  |
Total current assets | 462,322 | 521,666 |  |
Property and equipment – net | 910,327 | 903,977 |  |
Restricted cash and investments | 12,396 | 13,038 |  |
Other assets | 9,032 | 9,759 |  |
Total assets | 1,394,077 | 1,448,440 |  |
Current Liabilities: |  |  |  |
Accounts payable | 30,607 | 28,704 |  |
Accrued and other current liabilities | 33,703 | 28,346 |  |
Total current liabilities | 64,310 | 57,050 |  |
Long-term debt | 598,182 | 631,247 |  |
Deferred income taxes and other long-term liabilities | 149,524 | 160,365 |  |
Shareholders’ Equity: |  |  |  |
Common stock and paid-in capital | 308,634 | 305,815 |  |
Accumulated other comprehensive loss | (244) | (478) |  |
Retained earnings | 273,671 | 294,441 |  |
Total shareholders’ equity | 582,061 | 599,778 | 621,487 | 626,998
Total liabilities and shareholders’ equity | 1,394,077 | 1,448,440 |  |
Eliminations [Member] |  |  |  |
Current Assets: |  |  |  |
Accounts receivable - net | (10,772) |  |  |
Intercompany receivable | (120,376) | (57,904) |  |
Total current assets | (131,148) | (57,904) |  |
Investment in subsidiaries and others | (390,840) | (353,160) |  |
Total assets | (521,988) | (411,064) |  |
Current Liabilities: |  |  |  |
Accounts payable | (10,772) |  |  |
Intercompany payable | (120,376) | (57,904) |  |
Total current liabilities | (131,148) | (57,904) |  |
Shareholders’ Equity: |  |  |  |
Common stock and paid-in capital | (79,326) | (79,191) |  |
Retained earnings | (311,514) | (273,969) |  |
Total shareholders’ equity | (390,840) | (353,160) |  |
Total liabilities and shareholders’ equity | (521,988) | (411,064) |  |
Parent Company Only (issuer) [Member] |  |  |  |
Current Assets: |  |  |  |
Cash | 50 | 36 | 36 | 46
Short-term investments | 204,036 | 289,806 |  |
Accounts receivable - net | 77,061 | 71,458 |  |
Inventories of spare parts – net | 70,617 | 61,834 |  |
Prepaid expenses | 9,916 | 6,990 |  |
Deferred income taxes | 10,798 | 10,798 |  |
Income taxes receivable | 500 | 558 |  |
Total current assets | 372,978 | 441,480 |  |
Investment in subsidiaries and others | 390,840 | 353,160 |  |
Property and equipment – net | 621,885 | 589,104 |  |
Restricted cash and investments | 12,381 | 13,023 |  |
Other assets | 8,076 | 8,660 |  |
Total assets | 1,406,160 | 1,405,427 |  |
Current Liabilities: |  |  |  |
Accounts payable | 26,587 | 22,744 |  |
Accrued and other current liabilities | 22,198 | 18,725 |  |
Intercompany payable | 112,015 | 57,904 |  |
Total current liabilities | 160,800 | 99,373 |  |
Long-term debt | 598,182 | 631,247 |  |
Deferred income taxes and other long-term liabilities | 65,117 | 75,029 |  |
Shareholders’ Equity: |  |  |  |
Common stock and paid-in capital | 308,634 | 305,815 |  |
Accumulated other comprehensive loss | (244) | (478) |  |
Retained earnings | 273,671 | 294,441 |  |
Total shareholders’ equity | 582,061 | 599,778 |  |
Total liabilities and shareholders’ equity | 1,406,160 | 1,405,427 |  |
Guarantor Subsidiaries [Member] |  |  |  |
Current Assets: |  |  |  |
Cash | 1,071 | 2,100 | $ 2,603 | $ 2,361
Accounts receivable - net | 71,727 | 66,807 |  |
Intercompany receivable | 120,376 | 57,904 |  |
Inventories of spare parts – net | 8,628 | 8,568 |  |
Prepaid expenses | 1,948 | 2,269 |  |
Income taxes receivable | 9 | (18) |  |
Total current assets | 203,759 | 138,090 |  |
Property and equipment – net | 287,841 | 314,873 |  |
Restricted cash and investments | 0 | 15 |  |
Other assets | 956 | 1,099 |  |
Total assets | 492,556 | 454,077 |  |
Current Liabilities: |  |  |  |
Accounts payable | 3,557 | 5,960 |  |
Accrued and other current liabilities | 9,961 | 9,621 |  |
Total current liabilities | 13,518 | 15,581 |  |
Deferred income taxes and other long-term liabilities | 83,891 | 85,336 |  |
Shareholders’ Equity: |  |  |  |
Common stock and paid-in capital | 77,951 | 79,191 |  |
Retained earnings | 317,196 | 273,969 |  |
Total shareholders’ equity | 395,147 | 353,160 |  |
Total liabilities and shareholders’ equity | 492,556 | 454,077 |  |
Non-Guarantor Subsidiaries [Member] |  |  |  |
Current Assets: |  |  |  |
Cash | 1,870 | 460 |  |
Accounts receivable - net | 14,721 |  |  |
Prepaid expenses | 142 |  |  |
Income taxes receivable | 0 |  |  |
Total current assets | 16,733 |  |  |
Property and equipment – net | 601 |  |  |
Restricted cash and investments | 15 |  |  |
Total assets | 17,349 |  |  |
Current Liabilities: |  |  |  |
Accounts payable | 11,235 |  |  |
Accrued and other current liabilities | 1,544 |  |  |
Intercompany payable | 8,361 |  |  |
Total current liabilities | 21,140 |  |  |
Deferred income taxes and other long-term liabilities | 516 |  |  |
Shareholders’ Equity: |  |  |  |
Common stock and paid-in capital | 1,375 |  |  |
Retained earnings | (5,682) |  |  |
Total shareholders’ equity | (4,307) |  |  |
Total liabilities and shareholders’ equity | $ 17,349 |  |  |
Guarantor and Non-Guarantor Subsidiaries [Member] |  |  |  |
Current Assets: |  |  |  |
Cash |  | $ 2,560 |  |

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