v3.7.0.1

Condensed Consolidating Financial Information - Guarantor Subsidiaries - Condensed Consolidating Balance Sheets (Detail) - USD ($) $ in Thousands | Mar. 31, 2017 | Dec. 31, 2016 | Mar. 31, 2016 | Dec. 31, 2015
--- | --- | --- | --- | ---
Current Assets: |  |  |  |  |
Cash |  | $ 3,680 | $ 2,596 | $ 6,536 | $ 2,407
Short-term investments |  | 276,818 | 289,806 |  |
Accounts receivable - net |  | 126,270 | 138,265 |  |
Inventories of spare parts - net |  | 73,033 | 70,402 |  |
Prepaid expenses |  | 10,330 | 9,259 |  |
Deferred income taxes |  | 10,798 | 10,798 |  |
Income taxes receivable |  | 323 | 540 |  |
Total current assets |  | 501,252 | 521,666 |  |
Property and equipment - net |  | 896,565 | 903,977 |  |
Restricted cash and investments |  | 13,038 | 13,038 |  |
Other assets |  | 8,873 | 9,759 |  |
Total assets |  | 1,419,728 | 1,448,440 |  |
Current Liabilities: |  |  |  |  |
Accounts payable |  | 22,054 | 28,704 |  |
Accrued and other current liabilities |  | 27,500 | 28,346 |  |
Total current liabilities |  | 49,554 | 57,050 |  |
Long-term debt |  | 633,059 | 631,247 |  |
Deferred income taxes and other long-term liabilities |  | 151,001 | 160,365 |  |
Shareholders' Equity: |  |  |  |  |
Common stock and paid-in capital |  | 306,268 | 305,815 |  |
Accumulated other comprehensive income (loss) |  | (375) | (478) |  |
Retained earnings |  | 280,221 | 294,441 |  |
Total shareholders' equity |  | 586,114 | 599,778 | 619,537 | 626,998
Total liabilities and shareholders' equity |  | 1,419,728 | 1,448,440 |  |
Parent Company Only (issuer) [Member] |  |  |  |  |
Current Assets: |  |  |  |  |
Cash |  | 51 | 36 | 123 | 46
Short-term investments |  | 276,818 | 289,806 |  |
Accounts receivable - net |  | 65,044 | 71,458 |  |
Inventories of spare parts - net |  | 64,698 | 61,834 |  |
Prepaid expenses |  | 8,144 | 6,990 |  |
Deferred income taxes |  | 10,798 | 10,798 |  |
Income taxes receivable |  | 341 | 558 |  |
Total current assets |  | 425,894 | 441,480 |  |
Investment in subsidiaries and others |  | 361,420 | 353,160 |  |
Property and equipment - net |  | 581,990 | 589,104 |  |
Restricted cash and investments |  | 13,023 | 13,023 |  |
Other assets |  | 7,819 | 8,660 |  |
Total assets |  | 1,390,146 | 1,405,427 |  |
Current Liabilities: |  |  |  |  |
Accounts payable |  | 18,007 | 22,744 |  |
Accrued and other current liabilities |  | 18,034 | 18,725 |  |
Intercompany payable |  | 69,862 | 57,904 |  |
Total current liabilities |  | 105,903 | 99,373 |  |
Long-term debt |  | 633,059 | 631,247 |  |
Deferred income taxes and other long-term liabilities |  | 65,070 | 75,029 |  |
Shareholders' Equity: |  |  |  |  |
Common stock and paid-in capital |  | 306,268 | 305,815 |  |
Accumulated other comprehensive income (loss) |  | (375) | (478) |  |
Retained earnings |  | 280,221 | 294,441 |  |
Total shareholders' equity |  | 586,114 | 599,778 |  |
Total liabilities and shareholders' equity |  | 1,390,146 | 1,405,427 |  |
Guarantor Subsidiaries [Member] |  |  |  |  |
Current Assets: |  |  |  |  |
Cash | [1] | 3,629 | 2,560 | $ 6,413 | $ 2,361
Accounts receivable - net | [1] | 61,226 | 66,807 |  |
Intercompany receivable | [1] | 69,862 | 57,904 |  |
Inventories of spare parts - net | [1] | 8,335 | 8,568 |  |
Prepaid expenses | [1] | 2,186 | 2,269 |  |
Income taxes receivable | [1] | (18) | (18) |  |
Total current assets | [1] | 145,220 | 138,090 |  |
Property and equipment - net | [1] | 314,575 | 314,873 |  |
Restricted cash and investments | [1] | 15 | 15 |  |
Other assets | [1] | 1,054 | 1,099 |  |
Total assets | [1] | 460,864 | 454,077 |  |
Current Liabilities: |  |  |  |  |
Accounts payable | [1] | 4,047 | 5,960 |  |
Accrued and other current liabilities | [1] | 9,466 | 9,621 |  |
Total current liabilities | [1] | 13,513 | 15,581 |  |
Deferred income taxes and other long-term liabilities | [1] | 85,931 | 85,336 |  |
Shareholders' Equity: |  |  |  |  |
Common stock and paid-in capital | [1] | 79,326 | 79,191 |  |
Retained earnings | [1] | 282,094 | 273,969 |  |
Total shareholders' equity | [1] | 361,420 | 353,160 |  |
Total liabilities and shareholders' equity | [1] | 460,864 | 454,077 |  |
Eliminations [Member] |  |  |  |  |
Current Assets: |  |  |  |  |
Intercompany receivable |  | (69,862) | (57,904) |  |
Total current assets |  | (69,862) | (57,904) |  |
Investment in subsidiaries and others |  | (361,420) | (353,160) |  |
Total assets |  | (431,282) | (411,064) |  |
Current Liabilities: |  |  |  |  |
Intercompany payable |  | (69,862) | (57,904) |  |
Total current liabilities |  | (69,862) | (57,904) |  |
Shareholders' Equity: |  |  |  |  |
Common stock and paid-in capital |  | (79,326) | (79,191) |  |
Retained earnings |  | (282,094) | (273,969) |  |
Total shareholders' equity |  | (361,062) | (353,160) |  |
Total liabilities and shareholders' equity |  | $ (431,282) | $ (411,064) |  |
[1] | Foreign subsidiaries represent minor subsidiaries and are included in the guarantor subsidiaries' amounts.

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