v3.7.0.1

Condensed Consolidating Financial Information - Guarantor Subsidiaries - Condensed Consolidating Balance Sheets (Detail) - USD ($) $ in Thousands | Jun. 30, 2017 | Dec. 31, 2016 | Jun. 30, 2016 | Dec. 31, 2015
--- | --- | --- | --- | ---
Current Assets: |  |  |  |
Cash | $ 2,323 | $ 2,596 | $ 8,567 | $ 2,407
Short-term investments | 237,433 | 289,806 |  |
Accounts receivable - net | 147,504 | 138,265 |  |
Inventories of spare parts – net | 76,155 | 70,402 |  |
Prepaid expenses | 13,131 | 9,259 |  |
Deferred income taxes | 10,798 | 10,798 |  |
Income taxes receivable | 414 | 540 |  |
Total current assets | 487,758 | 521,666 |  |
Property and equipment – net | 918,134 | 903,977 |  |
Restricted cash and investments | 12,396 | 13,038 |  |
Other assets | 10,172 | 9,759 |  |
Total assets | 1,428,460 | 1,448,440 |  |
Current Liabilities: |  |  |  |
Accounts payable | 27,791 | 28,704 |  |
Accrued and other current liabilities | 33,384 | 28,346 |  |
Total current liabilities | 61,175 | 57,050 |  |
Long-term debt | 631,096 | 631,247 |  |
Deferred income taxes and other long-term liabilities | 152,128 | 160,365 |  |
Shareholders’ Equity: |  |  |  |
Common stock and paid-in capital | 307,367 | 305,815 |  |
Accumulated other comprehensive loss | (254) | (478) |  |
Retained earnings | 276,948 | 294,441 |  |
Total shareholders’ equity | 584,061 | 599,778 | 625,346 | 626,998
Total liabilities and shareholders’ equity | 1,428,460 | 1,448,440 |  |
Eliminations [Member] |  |  |  |
Current Assets: |  |  |  |
Accounts receivable - net | (2,819) |  |  |
Intercompany receivable | (105,938) | (57,904) |  |
Total current assets | (108,757) | (57,904) |  |
Investment in subsidiaries and others | (376,032) | (353,160) |  |
Total assets | (484,789) | (411,064) |  |
Current Liabilities: |  |  |  |
Accounts payable | (2,819) |  |  |
Intercompany payable | (105,938) | (57,904) |  |
Total current liabilities | (108,757) | (57,904) |  |
Shareholders’ Equity: |  |  |  |
Common stock and paid-in capital | (79,326) | (79,191) |  |
Retained earnings | (296,706) | (273,969) |  |
Total shareholders’ equity | (376,032) | (353,160) |  |
Total liabilities and shareholders’ equity | (484,789) | (411,064) |  |
Parent Company Only (issuer) [Member] |  |  |  |
Current Assets: |  |  |  |
Cash | 48 | 36 | 40 | 46
Short-term investments | 237,433 | 289,806 |  |
Accounts receivable - net | 78,334 | 71,458 |  |
Inventories of spare parts – net | 67,148 | 61,834 |  |
Prepaid expenses | 10,554 | 6,990 |  |
Deferred income taxes | 10,798 | 10,798 |  |
Income taxes receivable | 418 | 558 |  |
Total current assets | 404,733 | 441,480 |  |
Investment in subsidiaries and others | 376,032 | 353,160 |  |
Property and equipment – net | 626,402 | 589,104 |  |
Restricted cash and investments | 12,382 | 13,023 |  |
Other assets | 9,168 | 8,660 |  |
Total assets | 1,428,717 | 1,405,427 |  |
Current Liabilities: |  |  |  |
Accounts payable | 24,177 | 22,744 |  |
Accrued and other current liabilities | 24,508 | 18,725 |  |
Intercompany payable | 97,739 | 57,904 |  |
Total current liabilities | 146,424 | 99,373 |  |
Long-term debt | 631,096 | 631,247 |  |
Deferred income taxes and other long-term liabilities | 67,136 | 75,029 |  |
Shareholders’ Equity: |  |  |  |
Common stock and paid-in capital | 307,367 | 305,815 |  |
Accumulated other comprehensive loss | (254) | (478) |  |
Retained earnings | 276,948 | 294,441 |  |
Total shareholders’ equity | 584,061 | 599,778 |  |
Total liabilities and shareholders’ equity | 1,428,717 | 1,405,427 |  |
Guarantor Subsidiaries [Member] |  |  |  |
Current Assets: |  |  |  |
Cash | 1,328 | 2,100 | $ 8,527 | $ 2,361
Accounts receivable - net | 63,020 | 66,807 |  |
Intercompany receivable | 105,938 | 57,904 |  |
Inventories of spare parts – net | 9,007 | 8,568 |  |
Prepaid expenses | 2,394 | 2,269 |  |
Income taxes receivable | (4) | (18) |  |
Total current assets | 181,683 | 138,090 |  |
Property and equipment – net | 291,118 | 314,873 |  |
Restricted cash and investments | 0 | 15 |  |
Other assets | 1,004 | 1,099 |  |
Total assets | 473,805 | 454,077 |  |
Current Liabilities: |  |  |  |
Accounts payable | 3,200 | 5,960 |  |
Accrued and other current liabilities | 7,836 | 9,621 |  |
Total current liabilities | 11,036 | 15,581 |  |
Deferred income taxes and other long-term liabilities | 83,926 | 85,336 |  |
Shareholders’ Equity: |  |  |  |
Common stock and paid-in capital | 77,951 | 79,191 |  |
Retained earnings | 300,892 | 273,969 |  |
Total shareholders’ equity | 378,843 | 353,160 |  |
Total liabilities and shareholders’ equity | 473,805 | 454,077 |  |
Non-Guarantor Subsidiaries [Member] |  |  |  |
Current Assets: |  |  |  |
Cash | 947 | 460 |  |
Accounts receivable - net | 8,969 |  |  |
Prepaid expenses | 183 |  |  |
Income taxes receivable | 0 |  |  |
Total current assets | 10,099 |  |  |
Property and equipment – net | 614 |  |  |
Restricted cash and investments | 14 |  |  |
Total assets | 10,727 |  |  |
Current Liabilities: |  |  |  |
Accounts payable | 3,233 |  |  |
Accrued and other current liabilities | 1,040 |  |  |
Intercompany payable | 8,199 |  |  |
Total current liabilities | 12,472 |  |  |
Deferred income taxes and other long-term liabilities | 1,066 |  |  |
Shareholders’ Equity: |  |  |  |
Common stock and paid-in capital | 1,375 |  |  |
Retained earnings | (4,186) |  |  |
Total shareholders’ equity | (2,811) |  |  |
Total liabilities and shareholders’ equity | $ 10,727 |  |  |
Guarantor and Non-Guarantor Subsidiaries [Member] |  |  |  |
Current Assets: |  |  |  |
Cash |  | $ 2,560 |  |

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