v3.6.0.2

Condensed Consolidating Financial Information - Guarantor Subsidiaries - Condensed Consolidating Balance Sheets (Detail) - USD ($) $ in Thousands | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
--- | --- | --- | --- | ---
Current Assets: |  |  |  |  |
Cash |  | $ 2,596 | $ 2,407 | $ 6,270 | $ 934
Short-term investments |  | 289,806 | 284,523 |  |
Accounts receivable - net |  | 138,265 | 144,778 |  |
Inventories of spare parts - net |  | 70,402 | 69,491 |  |
Prepaid expenses |  | 9,259 | 8,951 |  |
Deferred income taxes |  | 10,798 | 10,379 |  |
Income taxes receivable |  | 540 | 761 |  |
Total current assets |  | 521,666 | 521,290 |  |
Property and equipment - net |  | 903,977 | 883,529 |  |
Restricted cash and investments |  | 13,038 | 15,336 |  |
Other assets |  | 9,759 | 6,178 |  |
Total assets |  | 1,448,440 | 1,426,333 |  |
Current Liabilities: |  |  |  |  |
Accounts payable |  | 28,704 | 31,373 |  |
Accrued and other current liabilities |  | 28,346 | 44,759 |  |
Total current liabilities |  | 57,050 | 76,132 |  |
Long-term debt |  | 631,247 | 553,501 |  |
Deferred income taxes and other long-term liabilities |  | 160,365 | 169,702 |  |
Shareholders' Equity: |  |  |  |  |
Common stock and paid-in capital |  | 305,815 | 306,444 |  |
Accumulated other comprehensive income (loss) |  | (478) | (567) |  |
Retained earnings |  | 294,441 | 321,121 |  |
Total shareholders' equity |  | 599,778 | 626,998 | 597,068 | 559,965
Total liabilities and shareholders' equity |  | 1,448,440 | 1,426,333 |  |
Parent Company Only (issuer) [Member] |  |  |  |  |
Current Assets: |  |  |  |  |
Cash |  | 36 | 46 | 51 | 52
Short-term investments |  | 289,806 | 284,523 |  |
Accounts receivable - net |  | 71,458 | 70,336 |  |
Inventories of spare parts - net |  | 61,834 | 60,060 |  |
Prepaid expenses |  | 6,990 | 7,162 |  |
Deferred income taxes |  | 10,798 | 10,379 |  |
Income taxes receivable |  | 558 | 1,002 |  |
Total current assets |  | 441,480 | 433,508 |  |
Investment in subsidiaries and others |  | 353,160 | 330,848 |  |
Property and equipment - net |  | 589,104 | 632,759 |  |
Restricted cash and investments |  | 13,023 | 15,336 |  |
Other assets |  | 8,660 | 5,975 |  |
Total assets |  | 1,405,427 | 1,418,426 |  |
Current Liabilities: |  |  |  |  |
Accounts payable |  | 22,744 | 25,512 |  |
Accrued and other current liabilities |  | 18,725 | 29,138 |  |
Intercompany payable |  | 57,904 | 90,943 |  |
Total current liabilities |  | 99,373 | 145,593 |  |
Long-term debt |  | 631,247 | 553,501 |  |
Deferred income taxes and other long-term liabilities |  | 75,029 | 92,334 |  |
Shareholders' Equity: |  |  |  |  |
Common stock and paid-in capital |  | 305,815 | 306,444 |  |
Accumulated other comprehensive income (loss) |  | (478) | (567) |  |
Retained earnings |  | 294,441 | 321,121 |  |
Total shareholders' equity |  | 599,778 | 626,998 |  |
Total liabilities and shareholders' equity |  | 1,405,427 | 1,418,426 |  |
Guarantor Subsidiaries [Member] |  |  |  |  |
Current Assets: |  |  |  |  |
Cash | [1] | 2,560 | 2,361 | $ 6,219 | $ 882
Accounts receivable - net | [1] | 66,807 | 74,442 |  |
Intercompany receivable | [1] | 57,904 | 90,943 |  |
Inventories of spare parts - net | [1] | 8,568 | 9,431 |  |
Prepaid expenses | [1] | 2,269 | 1,789 |  |
Income taxes receivable | [1] | (18) | (241) |  |
Total current assets | [1] | 138,090 | 178,725 |  |
Property and equipment - net | [1] | 314,873 | 250,770 |  |
Restricted cash and investments | [1] | 15 |  |  |
Other assets | [1] | 1,099 | 203 |  |
Total assets | [1] | 454,077 | 429,698 |  |
Current Liabilities: |  |  |  |  |
Accounts payable | [1] | 5,960 | 5,861 |  |
Accrued and other current liabilities | [1] | 9,621 | 15,621 |  |
Total current liabilities | [1] | 15,581 | 21,482 |  |
Deferred income taxes and other long-term liabilities | [1] | 85,336 | 77,368 |  |
Shareholders' Equity: |  |  |  |  |
Common stock and paid-in capital | [1] | 79,191 | 79,061 |  |
Retained earnings | [1] | 273,969 | 251,787 |  |
Total shareholders' equity | [1] | 353,160 | 330,848 |  |
Total liabilities and shareholders' equity | [1] | 454,077 | 429,698 |  |
Eliminations [Member] |  |  |  |  |
Current Assets: |  |  |  |  |
Intercompany receivable |  | (57,904) | (90,943) |  |
Total current assets |  | (57,904) | (90,943) |  |
Investment in subsidiaries and others |  | (353,160) | (330,848) |  |
Total assets |  | (411,064) | (421,791) |  |
Current Liabilities: |  |  |  |  |
Intercompany payable |  | (57,904) | (90,943) |  |
Total current liabilities |  | (57,904) | (90,943) |  |
Shareholders' Equity: |  |  |  |  |
Common stock and paid-in capital |  | (79,191) | (79,061) |  |
Retained earnings |  | (273,969) | (251,787) |  |
Total shareholders' equity |  | (353,160) | (330,848) |  |
Total liabilities and shareholders' equity |  | $ (411,064) | $ (421,791) |  |
[1] | Foreign subsidiaries represent minor subsidiaries and are included in the guarantor subsidiaries' amounts.

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